Β-ray measurement apparatus

Abstract

Disclosed in the present application is a β-ray measurement apparatus, comprising a β-ray emitting module for emitting a β-ray and a β-ray receiving module for receiving a β-ray. The β-ray emitting module and the β-ray receiving module are oppositely arranged, and there is a gap therebetween. A magnetic field is formed on the β-ray emitting module and / or the β-ray receiving module; a confined magnetic induction line is present in the magnetic field; the direction of the confined magnetic induction line is from the β-ray emitting module to the β-ray receiving module, or is from the β-ray receiving module to the β-ray emitting module; and there is a confined magnetic induction line passing through the gap. In the present application, the magnetic field is used to perform magnetic focusing or magnetic confinement on β-rays, so that the rays are more concentrated, and the ray intensity is enhanced; moreover, the size of a ray spot is reduced, and the measurement precision is improved; in addition, scattering can further be inhibited, and the utilization of rays is improved.

Description

Beta ray measuring device Technical Field

[0001] The present application relates to the technical field of lithium battery pole piece detection, and in particular to a β-ray measurement device. Background Art

[0002] In the field of non-destructive testing technology for membrane materials, X-rays are commonly used. However, X-rays are difficult to apply to special membrane materials. For example, X-rays are difficult to apply to the non-destructive testing of the negative electrode sheets of lithium batteries. This is because the negative electrode sheets of the battery are made by coating graphite on copper foil. The absorption coefficient of graphite to X-rays is much smaller than that of copper. When X-rays are used to measure the surface density of the negative electrode sheets, the difference in the surface density measurement values ​​between the coated and non-coated areas is not very obvious, and the measurement accuracy is poor. Currently, beta rays are mostly used for non-destructive testing of negative electrode sheets, but there are still some difficulties in using beta rays for non-destructive testing of membrane materials.

[0003] Beta rays, produced by the decay of radioactive materials, are a stream of electrons. Radioactive materials radiate beta rays in all directions. However, due to different generation mechanisms, it is difficult to confine all beta rays emitted by radioactive materials to a specific angular range, as is done with X-rays. To utilize beta rays, the radioactive material must be enclosed in a radiation-shielding box with only specific radiation ports, allowing the beta rays to radiate in that specific direction. Even with this, the beta ray beam emitted from the radiation ports of the radiation-shielding box still has a specific cone angle and is not a parallel beam. Compared to X-ray beams, beta ray beams project a larger spot size onto the film, resulting in lower measurement accuracy. Furthermore, due to their inherent properties, beta rays scatter strongly and in irregular directions, with greater scattering occurring with higher atomic numbers. This results in some beta rays being scattered during film inspection, leaving the receiver receiving only a portion of the emitted beta rays, resulting in low beta ray utilization. Summary of the Invention

[0004] The technical problem to be solved by the present application is to provide a β-ray measuring device in response to at least one defect of the related technology mentioned in the above background technology: the light spot projected by the β-ray on the film material is large, the measurement accuracy is relatively low, and the utilization rate of the β-ray is low.

[0005] The technical solution adopted by the present application to solve the technical problem is: constructing a beta ray measuring device, including a beta ray transmitting module for transmitting beta rays and a beta ray receiving module for receiving beta rays;

[0006] The beta-ray transmitting module and the beta-ray receiving module are arranged opposite to each other with a gap therebetween;

[0007] The β-ray transmitting module and / or the β-ray receiving module form a magnetic field, and there are constrained magnetic lines of flux in the magnetic field. The direction of the constrained magnetic lines of flux is from the β-ray transmitting module to the β-ray receiving module or from the β-ray receiving module to the β-ray transmitting module, and the constrained magnetic lines of flux pass through the gap.

[0008] Preferably, in the beta-ray measuring device described in the present application, the beta-ray emission module includes a first magnetic plate, a first shielding cover and a first beta-ray radiation source;

[0009] The first shielding cover has a first accommodating cavity, the first accommodating cavity has a first radiation port, the first beta-ray radiation source is accommodated in the first accommodating cavity, and the beta-ray is emitted from the first radiation port;

[0010] The first magnetic plate is located on one side of the first shielding cover, and the first magnetic plate faces away from the first radiation port;

[0011] And / or, the beta ray receiving module includes a first ray receiver and a second magnetic plate;

[0012] Wherein, the receiving port of the first ray receiver is opposite to the β-ray transmitting module;

[0013] The second magnetic plate is located at one side of the first ray receiver, and the second magnetic plate is away from the receiving port of the first ray receiver.

[0014] Preferably, in the beta-ray measuring device described in the present application, the first magnetic plate and the second magnetic plate are of the same size.

[0015] Preferably, in the beta-ray measuring device described in the present application, the beta-ray emission module includes a first current-carrying coil, a second shielding cover, and a second beta-ray radiation source;

[0016] The second shielding cover has a second accommodating cavity, the second accommodating cavity has a second radiation port, the second beta-ray radiation source is accommodated in the second accommodating cavity, and the beta-ray is emitted from the second radiation port;

[0017] The first current-carrying coil surrounds the outside of the second shielding cover; or, the first current-carrying coil is located at the second radiation port and surrounds the opening direction of the second radiation port;

[0018] And / or, the beta ray receiving module includes a second ray receiver and a second current-carrying coil;

[0019] Wherein, the receiving port of the second ray receiver is opposite to the β-ray transmitting module;

[0020] The second current-carrying coil surrounds the outer side of the second ray receiver; or, the second current-carrying coil is located at the receiving port and surrounds the opening direction of the receiving port.

[0021] Preferably, in the beta-ray measuring device described in the present application, the first current-carrying coil and the second current-carrying coil are of the same size.

[0022] Preferably, in the β-ray measuring device described in the present application, the first current-carrying coil and the second current-carrying coil are coaxial and parallel to each other in a plane, and the distance between the first current-carrying coil and the second current-carrying coil is less than or equal to the radius of the first current-carrying coil.

[0023] Preferably, in the beta-ray measuring device described in the present application, the beta-ray emission module includes a first magnetic ring, a third shielding cover and a third beta-ray radiation source;

[0024] The third shielding cover has a third accommodating cavity, the third accommodating cavity has a third radiation port, the third beta-ray radiation source is accommodated in the third accommodating cavity, and beta rays are emitted from the third radiation port;

[0025] The first magnetic ring surrounds the outer side of the third shielding cover; or, the first magnetic ring is located at the third radiation port and surrounds the opening direction of the third radiation port;

[0026] And / or, the beta ray receiving module includes a third ray receiver and a second magnetic ring;

[0027] Wherein, the receiving port of the third ray receiver is opposite to the β-ray transmitting module;

[0028] The second magnetic ring surrounds the outer side of the third ray receiver; or the second magnetic ring is located at the receiving port and surrounds the opening direction of the receiving port.

[0029] Preferably, in the beta-ray measuring device described in the present application, the first magnetic ring and the second magnetic ring are of the same size.

[0030] Preferably, in the beta-ray measuring device described in the present application, the first magnetic ring and the second magnetic ring are coaxial and parallel to each other in a plane, and the distance between the first magnetic ring and the second magnetic ring is less than or equal to the radius of the first magnetic ring.

[0031] Preferably, in the beta ray measuring device described in the present application, the first magnetic plate and the second magnetic plate are made of the same material, or the first current-carrying coil and the second current-carrying coil are made of the same material, or the first magnetic ring and the second magnetic ring are made of the same material.

[0032] By implementing this application, the following beneficial effects are achieved:

[0033] The present application utilizes a magnetic field to magnetically focus or magnetically confine beta rays, thereby making the rays more concentrated and reducing the ray spot, thereby improving measurement accuracy. In addition, it can also suppress scattering and improve the utilization rate of the rays. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present application will be further described below with reference to the accompanying drawings and embodiments, in which:

[0035] FIG1 is a schematic structural diagram of a beta-ray emission module forming a magnetic field through a magnetic plate in a first embodiment of the present application;

[0036] FIG2 is a schematic structural diagram of a beta-ray receiving module forming a magnetic field through a magnetic plate in a second embodiment of the present application;

[0037] 3 is a schematic structural diagram of a beta-ray transmitting module and a beta-ray receiving module forming a magnetic field through a magnetic plate in a third embodiment of the present application;

[0038] FIG4 is a schematic structural diagram of a beta-ray emission module forming a magnetic field through a current-carrying coil in a fourth embodiment of the present application;

[0039] FIG5 is a schematic structural diagram of a beta-ray receiving module forming a magnetic field through a current-carrying coil in a fifth embodiment of the present application;

[0040] FIG6 is a schematic structural diagram of a sixth embodiment of the present application showing a beta-ray transmitting module and a beta-ray receiving module forming a magnetic field through a current-carrying coil;

[0041] FIG7 is a schematic structural diagram of a beta-ray emission module forming a magnetic field through a magnetic ring in a seventh embodiment of the present application;

[0042] FIG8 is a schematic structural diagram of a beta-ray receiving module forming a magnetic field through a magnetic ring in an eighth embodiment of the present application;

[0043] FIG9 is a schematic structural diagram of a ninth embodiment of the present application in which a beta-ray transmitting module and a beta-ray receiving module form a magnetic field through a magnetic ring;

[0044] FIG10 is a schematic diagram of the β-ray charged particle beam of the present application performing equidistant spiral motion in a uniform magnetic field. DETAILED DESCRIPTION

[0045] In order to have a clearer understanding of the technical features, purposes and effects of this application, the specific implementation methods of this application are now described in detail with reference to the accompanying drawings.

[0046] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0047] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "Z-axis", "Y-axis", "X-axis", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "multiple" means two or more.

[0048] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "located at," and "located at" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or chemical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0049] As shown in FIG1 , the first embodiment of the present application discloses a beta-ray measuring device, including a beta-ray transmitting module 1 for transmitting beta-rays and a beta-ray receiving module 2 for receiving beta-rays, specifically as follows:

[0050] The β-ray emitting module 1 and the β-ray receiving module 2 are arranged relative to each other with a gap therebetween, which accommodates the object to be measured 3. For example, the β-ray emitting module 1 and the β-ray receiving module 2 are arranged relative to each other in the Z-axis direction, and the object to be measured 3 is located on the XY-axis plane of the gap. The object to be measured 3 is a sheet made of a film material, such as a lithium battery electrode. The Z-axis, X-axis, Y-axis, and lithium battery electrode herein are merely examples and are not intended to limit the present application.

[0051] The β-ray emission module 1 generates a magnetic field with constrained magnetic flux lines. These lines of flux point from the β-ray emission module 1 to the β-ray receiving module 2, or vice versa. Constrained magnetic flux lines pass through the gap, causing the β-ray charged particles to move in equidistant spirals from the β-ray emission module 1 to the β-ray receiving module 2 in the magnetic field, achieving magnetic focusing or magnetic confinement. The β-ray charged particles move in equidistant spirals in the magnetic field. If the magnetic field is approximately uniform, the trajectory of the β-ray charged particles approximates a cylinder. If the magnetic field is gradient, the trajectory of the β-ray charged particles approximates a frustum.

[0052] Surface density is often used to describe the mass distribution per unit area of ​​planar objects such as sheets, films, and paper. In order to measure the surface density of the object 3 to be measured, the β-ray receiving module 2 is used to receive the β-rays after penetrating the object 3 to be measured, convert the received rays into signal data, and calculate the surface density of the object 3 based on the negative exponential relationship between the attenuation ratio of the ray intensity and the surface density of the object 3 to be measured.

[0053] Specifically, the beta-ray emission module 1 includes a first magnetic plate 11a, a first shielding cover 12a, and a first beta-ray radiation source 13a. The first shielding cover 12a includes a first accommodating cavity 121a, which has a first radiation port 122a. The first beta-ray radiation source 13a is accommodated in the first accommodating cavity 121a, and the beta rays are emitted from the first radiation port 122a. The first magnetic plate 11a is located on one side of the first shielding cover 12a, and the first magnetic plate 11a faces away from the first radiation port 122a. The beta-ray receiving module 2 includes a first ray receiver 21a for receiving the beta rays after they have penetrated the object under test 3.

[0054] The first magnetic plate 11a is installed on one side of the first shielding cover 12a. For example, the first magnetic plate 11a is pasted on one side of the first shielding cover 12a. Pasting here is only an example and is not intended to limit the present application.

[0055] Alternatively, the β-ray emission module 1 further includes a first mounting seat 14 a , one side of the first shielding cover 12 a is mounted on the first mounting seat 14 a , and the first magnetic plate 11 a is mounted on the first mounting seat 14 a .

[0056] The north pole of the first magnetic plate 11a faces the beta-ray receiving module 2, and the magnetic field is a gradient magnetic field, constraining the direction of the magnetic flux lines from the beta-ray emitting module 1 to the beta-ray receiving module 2. Alternatively, the south pole of the first magnetic plate 11a faces the beta-ray receiving module 2, and the magnetic field is a gradient magnetic field, constraining the direction of the magnetic flux lines from the beta-ray receiving module 2 to the beta-ray emitting module 1. If the beta-ray emitting module 1 and the beta-ray receiving module 2 are close to each other, that is, the gap between them is sufficiently small, for example, 1-20 mm, the travel distance of the beta-ray charged particles is short. Even if the trajectory of the beta-ray charged particles in the gradient magnetic field approximates a frustum, the actual deviation is not large, that is, the difference in radius between the upper and lower end surfaces of the frustum is not large, and the same magnetic focusing or magnetic confinement effect can be achieved.

[0057] As shown in FIG2 , the second embodiment of the present application discloses a beta-ray measuring device, including a beta-ray transmitting module 1 for transmitting beta-rays and a beta-ray receiving module 2 for receiving beta-rays, specifically as follows:

[0058] The β-ray emitting module 1 and the β-ray receiving module 2 are arranged relative to each other with a gap therebetween, which accommodates the object to be measured 3. For example, the β-ray emitting module 1 and the β-ray receiving module 2 are arranged relative to each other in the Z-axis direction, and the object to be measured 3 is located on the XY-axis plane of the gap. The object to be measured 3 is a sheet made of a film material, such as a lithium battery electrode. The Z-axis, X-axis, Y-axis, and lithium battery electrode herein are merely examples and are not intended to limit the present application.

[0059] The β-ray receiving module 2 generates a magnetic field with constrained magnetic flux lines. These lines of flux point from the β-ray receiving module 2 to the β-ray transmitting module 1, or vice versa. Constrained magnetic flux lines pass through the gap, causing the β-ray charged particles to move in equidistant spirals in the magnetic field from the β-ray transmitting module 1 to the β-ray receiving module 2, thereby achieving magnetic focusing or magnetic confinement. The β-ray charged particles move in equidistant spirals in the magnetic field. If the magnetic field is approximately uniform, the trajectory of the β-ray charged particles approximates a cylinder. If the magnetic field is gradient, the trajectory of the β-ray charged particles approximates a frustum.

[0060] Surface density is often used to describe the mass distribution per unit area of ​​planar objects such as sheets, films, and paper. In order to measure the surface density of the object 3 to be measured, the β-ray receiving module 2 is used to convert the received rays into signal data, and calculate the surface density of the object 3 to be measured based on the negative exponential relationship between the attenuation ratio of the ray intensity and the surface density of the object 3 to be measured.

[0061] Specifically, the beta-ray emission module 1 includes a first shielding cover 12a and a first beta-ray radiation source 13a. The first shielding cover 12a defines a first accommodating cavity 121a, which has a first radiation port 122a. The first beta-ray radiation source 13a is accommodated in the first accommodating cavity 121a, and beta rays are emitted from the first radiation port 122a.

[0062] The beta-ray receiving module 2 includes a first ray receiver 21a and a second magnetic plate 22a. The receiving port of the first ray receiver 21a is opposite the beta-ray transmitting module 1 and is used to receive beta rays that have penetrated the object under test 3. The second magnetic plate 22a is located to one side of the first ray receiver 21a, facing away from the receiving port of the first ray receiver 21a.

[0063] The second magnetic plate 22a is installed on one side of the first ray receiver 21a. For example, the second magnetic plate 22a is pasted on one side of the first ray receiver 21a. Pasting here is only an example and is not a limitation to this application.

[0064] Alternatively, the β-ray receiving module 2 further includes a second mounting seat 23 a , one side of the first ray receiver 21 a is mounted on the second mounting seat 23 a , and the second magnetic plate 22 a is mounted on the second mounting seat 23 a .

[0065] The north pole of the second magnetic plate 22a faces the beta-ray emitting module 1, and the magnetic field is a gradient field, constraining the direction of the magnetic flux lines from the beta-ray receiving module 2 to the beta-ray emitting module 1. Alternatively, the south pole of the second magnetic plate 22a faces the beta-ray emitting module 1, and the magnetic field is a gradient field, constraining the direction of the magnetic flux lines from the beta-ray emitting module 1 to the beta-ray receiving module 2. If the beta-ray emitting module 1 and the beta-ray receiving module 2 are close to each other, that is, the gap between them is sufficiently small, for example, 1-20 mm, the travel distance of the beta-ray charged particles is short. Even if the trajectory of the beta-ray charged particles in the gradient magnetic field approximates a frustum, the actual deviation is not large, that is, the difference in radius between the upper and lower end surfaces of the frustum is not large, and the same magnetic focusing or magnetic confinement effect can be achieved.

[0066] As shown in FIG3 , the third embodiment of the present application discloses a beta-ray measuring device, including a beta-ray transmitting module 1 for transmitting beta-rays and a beta-ray receiving module 2 for receiving beta-rays, specifically as follows:

[0067] The β-ray emitting module 1 and the β-ray receiving module 2 are arranged relative to each other with a gap therebetween, which accommodates the object to be measured 3. For example, the β-ray emitting module 1 and the β-ray receiving module 2 are arranged relative to each other in the Z-axis direction, and the object to be measured 3 is located on the XY-axis plane of the gap. The object to be measured 3 is a sheet made of a film material, such as a lithium battery electrode. The Z-axis, X-axis, Y-axis, and lithium battery electrode herein are merely examples and are not intended to limit the present application.

[0068] Beta-ray transmitting module 1 and beta-ray receiving module 2 form a magnetic field with constrained magnetic flux lines. These lines of flux point from beta-ray transmitting module 1 to beta-ray receiving module 2, or vice versa. Constrained magnetic flux lines pass through the gap, causing beta-ray charged particles to move in equidistant spirals from beta-ray transmitting module 1 to beta-ray receiving module 2 in the magnetic field, achieving magnetic focusing or magnetic confinement. Beta-ray charged particles move in equidistant spirals in the magnetic field. If the magnetic field is approximately uniform, the trajectory of the beta-ray charged particles approximates a cylinder. If the magnetic field is gradient, the trajectory of the beta-ray charged particles approximates a frustum.

[0069] Surface density is often used to describe the mass distribution per unit area of ​​planar objects such as sheets, films, and paper. In order to measure the surface density of the object 3 to be measured, the β-ray receiving module 2 is used to convert the received rays into signal data, and calculate the surface density of the object 3 to be measured based on the negative exponential relationship between the attenuation ratio of the ray intensity and the surface density of the object 3 to be measured.

[0070] Specifically, the beta-ray emission module 1 includes a first magnetic plate 11a, a first shielding cover 12a, and a first beta-ray radiation source 13a. The first shielding cover 12a defines a first accommodating cavity 121a, which has a first radiation port 122a. The first beta-ray radiation source 13a is housed within the first accommodating cavity 121a, and beta rays are emitted from the first radiation port 122a. The first magnetic plate 11a is located on one side of the first shielding cover 12a, facing away from the first radiation port 122a.

[0071] The first magnetic plate 11a is installed on one side of the first shielding cover 12a. For example, the first magnetic plate 11a is pasted on one side of the first shielding cover 12a. Pasting here is only an example and is not intended to limit the present application.

[0072] Alternatively, the β-ray emission module 1 further includes a first mounting seat 14 a , one side of the first shielding cover 12 a is mounted on the first mounting seat 14 a , and the first magnetic plate 11 a is mounted on the first mounting seat 14 a .

[0073] The beta-ray receiving module 2 includes a first ray receiver 21a and a second magnetic plate 22a. The receiving port of the first ray receiver 21a is opposite the beta-ray transmitting module 1 and is used to receive beta rays that have penetrated the object under test 3. The second magnetic plate 22a is located to one side of the first ray receiver 21a, facing away from the receiving port of the first ray receiver 21a.

[0074] The second magnetic plate 22a is installed on one side of the first ray receiver 21a. For example, the second magnetic plate 22a is pasted on one side of the first ray receiver 21a. Pasting here is only an example and is not a limitation to this application.

[0075] Alternatively, the β-ray emitting module 1 further includes a second mounting base 23 a , one side of the first ray receiver 21 a is mounted on the second mounting base 23 a , and the second magnetic plate 22 a is mounted on the second mounting base 23 a .

[0076] The north pole of the first magnetic plate 11a faces the south pole of the second magnetic plate 22a, creating a nearly uniform magnetic field, which constrains the magnetic flux lines from the beta-ray transmitting module 1 to the beta-ray receiving module 2. Alternatively, the south pole of the first magnetic plate 11a faces the north pole of the second magnetic plate 22a, creating a nearly uniform magnetic field, which constrains the magnetic flux lines from the beta-ray receiving module 2 to the beta-ray transmitting module 1. Furthermore, the first magnetic plate 11a and the second magnetic plate 22a are of the same size and material.

[0077] In the first, second and third embodiments above, the first magnetic plate 11a and the second magnetic plate 22a are natural magnets, and the first shielding cover 12a is a cover made of lead. The natural magnets and the cover made of lead are only examples and are not intended to limit the present application.

[0078] As shown in FIG4 , the fourth embodiment of the present application discloses a beta-ray measuring device, including a beta-ray transmitting module 1 for transmitting beta-rays and a beta-ray receiving module 2 for receiving beta-rays, specifically as follows:

[0079] The β-ray emitting module 1 and the β-ray receiving module 2 are arranged relative to each other with a gap therebetween, which accommodates the object to be measured 3. For example, the β-ray emitting module 1 and the β-ray receiving module 2 are arranged relative to each other in the Z-axis direction, and the object to be measured 3 is located on the XY-axis plane of the gap. The object to be measured 3 is a sheet made of a film material, such as a lithium battery electrode. The Z-axis, X-axis, Y-axis, and lithium battery electrode herein are merely examples and are not intended to limit the present application.

[0080] The β-ray emission module 1 generates a magnetic field with constrained magnetic flux lines. These lines of flux point from the β-ray emission module 1 to the β-ray receiving module 2, or vice versa. Constrained magnetic flux lines pass through the gap, causing the β-ray charged particles to move in equidistant spirals from the β-ray emission module 1 to the β-ray receiving module 2 in the magnetic field, achieving magnetic focusing or magnetic confinement. The β-ray charged particles move in equidistant spirals in the magnetic field. If the magnetic field is approximately uniform, the trajectory of the β-ray charged particles approximates a cylinder. If the magnetic field is gradient, the trajectory of the β-ray charged particles approximates a frustum.

[0081] Surface density is often used to describe the mass distribution per unit area of ​​planar objects such as sheets, films, and paper. In order to measure the surface density of the object 3 to be measured, the β-ray receiving module 2 is used to receive the β-rays after penetrating the object 3 to be measured, convert the received rays into signal data, and calculate the surface density of the object 3 based on the negative exponential relationship between the attenuation ratio of the ray intensity and the surface density of the object 3 to be measured.

[0082] Specifically, the beta-ray transmitting module 1 includes a first current-carrying coil 11b, a second shielding cover 12b, and a second beta-ray radiation source 13b. The second shielding cover 12b defines a second accommodating cavity 121b, which has a second radiation port 122b. The second beta-ray radiation source 13b is housed within the second accommodating cavity 121b, and the beta rays are emitted from the second radiation port 122b. The beta-ray receiving module 2 includes a second radiation receiver 21b for receiving the beta rays after they have penetrated the object under test 3.

[0083] The first current-carrying coil 11b surrounds the outer side of the second shielding cover 12b. Alternatively, the first current-carrying coil 11b is located at the second radiation port 122b and surrounds the opening direction of the second radiation port 122b.

[0084] The north pole of the first current-carrying coil 11b is opposite to the beta-ray receiving module 2, forming a convergent magnetic field with the central axis of the first current-carrying coil 11b as the axis of symmetry. The magnetic field is a gradient magnetic field, which constrains the direction of the magnetic flux lines from the beta-ray transmitting module 1 to the beta-ray receiving module 2. Alternatively, the south pole of the first current-carrying coil 11b is opposite to the beta-ray receiving module 2, forming a convergent magnetic field with the central axis of the first current-carrying coil 11b as the axis of symmetry. The magnetic field is a gradient magnetic field, which constrains the direction of the magnetic flux lines from the beta-ray receiving module 2 to the beta-ray transmitting module 1.

[0085] If the β-ray emitting module 1 and the β-ray receiving module 2 are close to each other, that is, the gap between them is small enough, for example, 1-20 mm, then the movement distance of the β-ray charged particles is short. Even if the movement trajectory of the β-ray charged particles in the gradient magnetic field is approximately a frustum, the actual deviation is not large, that is, the radius difference between the upper and lower end surfaces of the frustum is not large, and the effect of magnetic focusing or magnetic confinement can also be achieved.

[0086] As shown in FIG5 , the fifth embodiment of the present application discloses a beta-ray measuring device, including a beta-ray transmitting module 1 for transmitting beta-rays and a beta-ray receiving module 2 for receiving beta-rays, specifically as follows:

[0087] The β-ray emitting module 1 and the β-ray receiving module 2 are arranged relative to each other with a gap therebetween, which accommodates the object to be measured 3. For example, the β-ray emitting module 1 and the β-ray receiving module 2 are arranged relative to each other in the Z-axis direction, and the object to be measured 3 is located on the XY-axis plane of the gap. The object to be measured 3 is a sheet made of a film material, such as a lithium battery electrode. The Z-axis, X-axis, Y-axis, and lithium battery electrode herein are merely examples and are not intended to limit the present application.

[0088] The β-ray receiving module 2 generates a magnetic field with constrained magnetic flux lines. These lines of flux point from the β-ray receiving module 2 to the β-ray transmitting module 1, or vice versa. Constrained magnetic flux lines pass through the gap, causing the β-ray charged particles to move in equidistant spirals in the magnetic field from the β-ray transmitting module 1 to the β-ray receiving module 2, thereby achieving magnetic focusing or magnetic confinement. The β-ray charged particles move in equidistant spirals in the magnetic field. If the magnetic field is approximately uniform, the trajectory of the β-ray charged particles approximates a cylinder. If the magnetic field is gradient, the trajectory of the β-ray charged particles approximates a frustum.

[0089] Surface density is often used to describe the mass distribution per unit area of ​​planar objects such as sheets, films, and paper. In order to measure the surface density of the object 3 to be measured, the β-ray receiving module 2 is used to convert the received rays into signal data, and calculate the surface density of the object 3 to be measured based on the negative exponential relationship between the attenuation ratio of the ray intensity and the surface density of the object 3 to be measured.

[0090] Specifically, the beta-ray emission module 1 includes a second shielding cover 12b and a second beta-ray radiation source 13b. The second shielding cover 12b has a second accommodating cavity 121b, which has a second radiation port 122b. The second beta-ray radiation source 13b is accommodated in the second accommodating cavity 121b, and the beta rays are emitted from the second radiation port 122b.

[0091] The β-ray receiving module 2 includes a second ray receiver 21 b and a second current-carrying coil 22 b , wherein the receiving port of the second ray receiver 21 b is opposite to the β-ray transmitting module 1 and is used to receive the β-ray after penetrating the object 3 .

[0092] The second current-carrying coil 22b surrounds the outer side of the second radiation receiver 21b. Alternatively, the second current-carrying coil 22b is located at the receiving port and surrounds the opening direction of the receiving port.

[0093] The north pole of the second current-carrying coil 22b is opposite to the beta-ray transmitting module 1, forming a convergent magnetic field with the central axis of the second current-carrying coil 22b as the axis of symmetry. The magnetic field is a gradient magnetic field, which constrains the direction of the magnetic flux lines from the beta-ray receiving module 2 to the beta-ray transmitting module 1. Alternatively, the south pole of the second current-carrying coil 22b is opposite to the beta-ray transmitting module 1, forming a convergent magnetic field with the central axis of the second current-carrying coil 22b as the axis of symmetry. The magnetic field is a gradient magnetic field, which constrains the direction of the magnetic flux lines from the beta-ray transmitting module 1 to the beta-ray receiving module 2.

[0094] If the β-ray emitting module 1 and the β-ray receiving module 2 are close to each other, that is, the gap between them is small enough, for example, 1-20 mm, then the movement distance of the β-ray charged particles is short. Even if the movement trajectory of the β-ray charged particles in the gradient magnetic field is approximately a frustum, the actual deviation is not large, that is, the radius difference between the upper and lower end surfaces of the frustum is not large, and the effect of magnetic focusing or magnetic confinement can also be achieved.

[0095] As shown in FIG6 , the sixth embodiment of the present application discloses a beta-ray measuring device, including a beta-ray transmitting module 1 for transmitting beta-rays and a beta-ray receiving module 2 for receiving beta-rays, specifically as follows:

[0096] The β-ray emitting module 1 and the β-ray receiving module 2 are arranged relative to each other with a gap therebetween, which accommodates the object to be measured 3. For example, the β-ray emitting module 1 and the β-ray receiving module 2 are arranged relative to each other in the Z-axis direction, and the object to be measured 3 is located on the XY-axis plane of the gap. The object to be measured 3 is a sheet made of a film material, such as a lithium battery electrode. The Z-axis, X-axis, Y-axis, and lithium battery electrode herein are merely examples and are not intended to limit the present application.

[0097] Beta-ray transmitting module 1 and beta-ray receiving module 2 form a magnetic field with constrained magnetic flux lines. These lines of flux point from beta-ray transmitting module 1 to beta-ray receiving module 2, or vice versa. Constrained magnetic flux lines pass through the gap, causing beta-ray charged particles to move in equidistant spirals from beta-ray transmitting module 1 to beta-ray receiving module 2 in the magnetic field, achieving magnetic focusing or magnetic confinement. Beta-ray charged particles move in equidistant spirals in the magnetic field. If the magnetic field is approximately uniform, the trajectory of the beta-ray charged particles approximates a cylinder. If the magnetic field is gradient, the trajectory of the beta-ray charged particles approximates a frustum.

[0098] Surface density is often used to describe the mass distribution per unit area of ​​planar objects such as sheets, films, and paper. In order to measure the surface density of the object 3 to be measured, the β-ray receiving module 2 is used to convert the received rays into signal data, and calculate the surface density of the object 3 to be measured based on the negative exponential relationship between the attenuation ratio of the ray intensity and the surface density of the object 3 to be measured.

[0099] Specifically, the beta-ray emission module 1 includes a first current-carrying coil 11b, a second shielding cover 12b, and a second beta-ray radiation source 13b. The second shielding cover 12b defines a second accommodating cavity 121b, which has a second radiation port 122b. The second beta-ray radiation source 13b is accommodated in the second accommodating cavity 121b, and beta rays are emitted from the second radiation port 122b.

[0100] The first current-carrying coil 11b surrounds the outer side of the second shielding cover 12b. Alternatively, the first current-carrying coil 11b is located at the second radiation port 122b and surrounds the opening direction of the second radiation port 122b.

[0101] The β-ray receiving module 2 includes a second ray receiver 21 b and a second current-carrying coil 22 b , wherein the receiving port of the second ray receiver 21 b is opposite to the β-ray transmitting module 1 and is used to receive the β-ray after penetrating the object 3 .

[0102] The second current-carrying coil 22b surrounds the outer side of the second radiation receiver 21b. Alternatively, the second current-carrying coil 22b is located at the receiving port and surrounds the opening direction of the receiving port.

[0103] The north pole of the first current-carrying coil 11b is opposite to the south pole of the second current-carrying coil 22b, and the magnetic field is approximately uniform, constraining the direction of the magnetic flux lines from the beta-ray transmitting module 1 to the beta-ray receiving module 2. Alternatively, the south pole of the first current-carrying coil 11b is opposite to the north pole of the second current-carrying coil 22b, and the magnetic field is approximately uniform, constraining the direction of the magnetic flux lines from the beta-ray receiving module 2 to the beta-ray transmitting module 1.

[0104] Furthermore, the first current-carrying coil 11b and the second current-carrying coil 22b are of the same size and material. The currents flowing through the first and second current-carrying coils 11b, 22b are equal in magnitude and direction. The first and second current-carrying coils 11b, 22b are coaxial and parallel to each other in a plane. The distance between the first and second current-carrying coils 11b, 22b is less than or equal to the radius of the first current-carrying coil 11b.

[0105] In the fourth, fifth and sixth embodiments above, the first current-carrying coil 11b and the second current-carrying coil 22b are annular current-carrying coils, and the second shielding cover 12b is a cover body made of lead. The annular current-carrying coils and the cover body made of lead are merely examples and are not intended to limit the present application.

[0106] The magnetic induction intensity of the magnetic field generated by a single coil is relatively weak. If a stronger magnetic field needs to be generated, another commonly used method is to use multiple coils arranged closely together, that is, the current-carrying wire is regularly and tightly wound into N turns of coil, where N is greater than or equal to 2. This can generate a strong uniform magnetic field at the center axis of the coil and its surrounding area.

[0107] As shown in FIG7 , the seventh embodiment of the present application discloses a beta-ray measuring device, including a beta-ray transmitting module 1 for transmitting beta-rays and a beta-ray receiving module 2 for receiving beta-rays, specifically as follows:

[0108] The β-ray emitting module 1 and the β-ray receiving module 2 are arranged relative to each other with a gap therebetween, which accommodates the object to be measured 3. For example, the β-ray emitting module 1 and the β-ray receiving module 2 are arranged relative to each other in the Z-axis direction, and the object to be measured 3 is located on the XY-axis plane of the gap. The object to be measured 3 is a sheet made of a film material, such as a lithium battery electrode. The Z-axis, X-axis, Y-axis, and lithium battery electrode herein are merely examples and are not intended to limit the present application.

[0109] The β-ray emission module 1 generates a magnetic field with constrained magnetic flux lines. These lines of flux point from the β-ray emission module 1 to the β-ray receiving module 2, or vice versa. Constrained magnetic flux lines pass through the gap, causing the β-ray charged particles to move in equidistant spirals from the β-ray emission module 1 to the β-ray receiving module 2 in the magnetic field, achieving magnetic focusing or magnetic confinement. The β-ray charged particles move in equidistant spirals in the magnetic field. If the magnetic field is approximately uniform, the trajectory of the β-ray charged particles approximates a cylinder. If the magnetic field is gradient, the trajectory of the β-ray charged particles approximates a frustum.

[0110] Surface density is often used to describe the mass distribution per unit area of ​​planar objects such as sheets, films, and paper. In order to measure the surface density of the object 3 to be measured, the β-ray receiving module 2 is used to receive the β-rays after penetrating the object 3 to be measured, convert the received rays into signal data, and calculate the surface density of the object 3 based on the negative exponential relationship between the attenuation ratio of the ray intensity and the surface density of the object 3 to be measured.

[0111] Specifically, the beta-ray transmitting module 1 includes a first magnetic ring 11c, a third shielding cover 12c, and a third beta-ray radiation source 13c. The third shielding cover 12c defines a third accommodating cavity 121c, which has a third radiation port 122c. The third beta-ray radiation source 13c is housed within the third accommodating cavity 121c, and beta rays are emitted from the third radiation port 122c. The beta-ray receiving module 2 includes a third ray receiver 21c for receiving beta rays that have passed through the object under test 3.

[0112] The first magnetic ring 11c surrounds the outside of the third shielding cover 12c. Alternatively, the first magnetic ring 11c is located at the third radiation opening 122c and surrounds the opening direction of the third radiation opening 122c.

[0113] The north pole of the first magnetic ring 11c is opposite to the beta-ray receiving module 2, forming a convergent magnetic field with the central axis of the first magnetic ring 11c as the axis of symmetry. The magnetic field is a gradient magnetic field, which constrains the direction of the magnetic flux lines from the beta-ray transmitting module 1 to the beta-ray receiving module 2. Alternatively, the south pole of the first magnetic ring 11c is opposite to the beta-ray receiving module 2, forming a convergent magnetic field with the central axis of the first magnetic ring 11c as the axis of symmetry. The magnetic field is a gradient magnetic field, which constrains the direction of the magnetic flux lines from the beta-ray receiving module 2 to the beta-ray transmitting module 1.

[0114] If the β-ray emitting module 1 and the β-ray receiving module 2 are close to each other, that is, the gap between them is small enough, for example, 1-20 mm, then the movement distance of the β-ray charged particles is short. Even if the movement trajectory of the β-ray charged particles in the gradient magnetic field is approximately a frustum, the actual deviation is not large, that is, the radius difference between the upper and lower end surfaces of the frustum is not large, and the effect of magnetic focusing or magnetic confinement can also be achieved.

[0115] As shown in FIG8 , the eighth embodiment of the present application discloses a beta-ray measuring device, including a beta-ray transmitting module 1 for transmitting beta-rays and a beta-ray receiving module 2 for receiving beta-rays, specifically as follows:

[0116] The β-ray emitting module 1 and the β-ray receiving module 2 are arranged relative to each other with a gap therebetween, which accommodates the object to be measured 3. For example, the β-ray emitting module 1 and the β-ray receiving module 2 are arranged relative to each other in the Z-axis direction, and the object to be measured 3 is located on the XY-axis plane of the gap. The object to be measured 3 is a sheet made of a film material, such as a lithium battery electrode. The Z-axis, X-axis, Y-axis, and lithium battery electrode herein are merely examples and are not intended to limit the present application.

[0117] The β-ray receiving module 2 generates a magnetic field with constrained magnetic flux lines. These lines of flux point from the β-ray receiving module 2 to the β-ray transmitting module 1, or vice versa. Constrained magnetic flux lines pass through the gap, causing the β-ray charged particles to move in equidistant spirals in the magnetic field from the β-ray transmitting module 1 to the β-ray receiving module 2, thereby achieving magnetic focusing or magnetic confinement. The β-ray charged particles move in equidistant spirals in the magnetic field. If the magnetic field is approximately uniform, the trajectory of the β-ray charged particles approximates a cylinder. If the magnetic field is gradient, the trajectory of the β-ray charged particles approximates a frustum.

[0118] Surface density is often used to describe the mass distribution per unit area of ​​planar objects such as sheets, films, and paper. In order to measure the surface density of the object 3 to be measured, the β-ray receiving module 2 is used to convert the received rays into signal data, and calculate the surface density of the object 3 to be measured based on the negative exponential relationship between the attenuation ratio of the ray intensity and the surface density of the object 3 to be measured.

[0119] Specifically, the beta-ray emission module 1 includes a third shielding cover 12c and a third beta-ray radiation source 13c. The third shielding cover 12c defines a third accommodating cavity 121c, which has a third radiation port 122c. The third beta-ray radiation source 13c is accommodated in the third accommodating cavity 121c, and beta rays are emitted from the third radiation port 122c.

[0120] The beta-ray receiving module 2 includes a third ray receiver 21c and a second magnetic ring 22c. The receiving port of the third ray receiver 21c is opposite the beta-ray transmitting module 1. The second magnetic ring 22c surrounds the outside of the third ray receiver 21c. Alternatively, the second magnetic ring 22c is located at the receiving port and surrounds the opening of the receiving port.

[0121] The north pole of the second magnetic ring 22c is opposite to the beta-ray emission module 1, forming a convergent magnetic field with the central axis of the second magnetic ring 22c as the axis of symmetry. The magnetic field is a gradient magnetic field, which constrains the direction of the magnetic flux lines from the beta-ray receiving module 2 to the beta-ray emission module 1. Alternatively, the south pole of the second magnetic ring 22c is opposite to the beta-ray emission module 1, forming a convergent magnetic field with the central axis of the second magnetic ring 22c as the axis of symmetry. The magnetic field is a gradient magnetic field, which constrains the direction of the magnetic flux lines from the beta-ray emission module 1 to the beta-ray receiving module 2.

[0122] If the β-ray emitting module 1 and the β-ray receiving module 2 are close to each other, that is, the gap between them is small enough, for example, 1-20 mm, then the movement distance of the β-ray charged particles is short. Even if the movement trajectory of the β-ray charged particles in the gradient magnetic field is approximately a frustum, the actual deviation is not large, that is, the radius difference between the upper and lower end surfaces of the frustum is not large, and the effect of magnetic focusing or magnetic confinement can also be achieved.

[0123] As shown in FIG9 , the ninth embodiment of the present application discloses a beta-ray measuring device, including a beta-ray transmitting module 1 for transmitting beta-rays and a beta-ray receiving module 2 for receiving beta-rays, specifically as follows:

[0124] The β-ray emitting module 1 and the β-ray receiving module 2 are arranged relative to each other with a gap therebetween, which accommodates the object to be measured 3. For example, the β-ray emitting module 1 and the β-ray receiving module 2 are arranged relative to each other in the Z-axis direction, and the object to be measured 3 is located on the XY-axis plane of the gap. The object to be measured 3 is a sheet made of a film material, such as a lithium battery electrode. The Z-axis, X-axis, Y-axis, and lithium battery electrode herein are merely examples and are not intended to limit the present application.

[0125] Beta-ray transmitting module 1 and beta-ray receiving module 2 form a magnetic field with constrained magnetic flux lines. These lines of flux point from beta-ray transmitting module 1 to beta-ray receiving module 2, or vice versa. Constrained magnetic flux lines pass through the gap, causing beta-ray charged particles to move in equidistant spirals from beta-ray transmitting module 1 to beta-ray receiving module 2 in the magnetic field, achieving magnetic focusing or magnetic confinement. Beta-ray charged particles move in equidistant spirals in the magnetic field. If the magnetic field is approximately uniform, the trajectory of the beta-ray charged particles approximates a cylinder. If the magnetic field is gradient, the trajectory of the beta-ray charged particles approximates a frustum.

[0126] Surface density is often used to describe the mass distribution per unit area of ​​planar objects such as sheets, films, and paper. In order to measure the surface density of the object 3 to be measured, the β-ray receiving module 2 is used to convert the received rays into signal data, and calculate the surface density of the object 3 to be measured based on the negative exponential relationship between the attenuation ratio of the ray intensity and the surface density of the object 3 to be measured.

[0127] Specifically, the beta-ray emission module 1 includes a first magnetic ring 11c, a third shielding cover 12c, and a third beta-ray radiation source 13c. The third shielding cover 12c defines a third accommodating cavity 121c, which has a third radiation port 122c. The third beta-ray radiation source 13c is housed within the third accommodating cavity 121c, and beta rays are emitted from the third radiation port 122c. The first magnetic ring 11c surrounds the outside of the third shielding cover 12c. Alternatively, the first magnetic ring 11c is located at the third radiation port 122c and surrounds the opening of the third radiation port 122c.

[0128] The beta-ray receiving module 2 includes a third ray receiver 21c and a second magnetic ring 22c. The receiving port of the third ray receiver 21c is opposite the beta-ray transmitting module 1. The second magnetic ring 22c surrounds the outside of the third ray receiver 21c. Alternatively, the second magnetic ring 22c is located at the receiving port and surrounds the opening of the receiving port.

[0129] The north pole of the first magnetic ring 11c is opposite to the south pole of the second magnetic ring 22c, and the magnetic field is approximately uniform, constraining the direction of the magnetic flux lines from the beta-ray transmitting module 1 to the beta-ray receiving module 2. Alternatively, the south pole of the first magnetic ring 11c is opposite to the north pole of the second magnetic ring 22c, and the magnetic field is approximately uniform, constraining the direction of the magnetic flux lines from the beta-ray receiving module 2 to the beta-ray transmitting module 1.

[0130] In addition, the first magnetic ring 11c and the second magnetic ring 22c are of the same size and material. The first magnetic ring 11c and the second magnetic ring 22c are coaxial and parallel to each other in the plane, and the distance between the first magnetic ring 11c and the second magnetic ring 22c is less than or equal to the radius of the first magnetic ring 11c.

[0131] In the seventh, eighth and ninth embodiments mentioned above, the third shielding cover 12c is a cover body made of lead, the first magnetic ring 11c and the second magnetic ring 22c are annular permanent magnets. A permanent magnet is a material that can generate a constant magnetic field, and is usually made of ferromagnetic materials such as iron, cobalt and nickel. The cover body and annular permanent magnet made of lead here are only examples and are not intended to limit the present application.

[0132] Based on any of the above embodiments, the first beta-ray radiation source 13a, the second beta-ray radiation source 13b, and the third beta-ray radiation source 13c are referred to as beta-ray radiation sources, and the first ray receiver 21a, the second ray receiver 21b, and the third ray receiver 21c are referred to as ray receivers. As shown in FIG10 , the motion of the beta-ray charged particle beam in a uniform magnetic field is as follows:

[0133] Beta rays are actually high-speed beams of charged particles. They are lightweight, have strong penetrating power, and weak ionization, causing them to deflect in a uniform magnetic field B. When a charged particle beam enters uniform magnetic field B from a beta ray source, the velocity direction V of the charged particle beam forms an angle θ with the magnetic field of uniform magnetic field B. The charged particle beam moves in an equidistant spiral along the Z axis within uniform magnetic field B.

[0134] Specifically, the β-ray radiation source emits β-rays with a certain emission angle with the Z-axis direction as the axial direction. The β-rays penetrate the object 3. A part of the β-rays is blocked by the object 3, and the other part of the β-rays penetrate the object 3 and are received by the ray receiver. The ray receiver converts the received rays into signal data. The intensity of the rays after penetrating the object 3 is attenuated compared to the intensity of the rays before penetrating the object 3. The attenuation ratio of the ray intensity is in a negative exponential relationship with the surface density of the object 3. The surface density of the object 3 is calculated based on this relationship.

[0135] A uniform magnetic field B is oriented along the Z axis. When a charged particle beam enters the uniform magnetic field B from a beta-ray source, point A, its velocity V forms an angle θ with the magnetic field. Velocity V can be decomposed into a velocity component Vx perpendicular to the uniform magnetic field B and a velocity component Vz parallel to the uniform magnetic field B: Vx = V*sinθ, and Vz = V*cosθ. Due to the Lorentz force, the velocity component Vx perpendicular to the uniform magnetic field B remains constant in magnitude, but only in direction, resulting in uniform circular motion in the XY plane. The velocity component Vz parallel to the uniform magnetic field B remains constant in magnitude and direction, and its motion is uniform linear motion along the Z axis. The combined motion of these two motions is an equidistant spiral motion in space along the Z axis.

[0136] When a charged particle beam follows an equidistant spiral, the radius of this spiral, or the radius of gyration of the circular motion of the charged particle beam in a uniform magnetic field B, is called the radius of curvature of the equidistant spiral and is represented by R: R = mVx / (qB) = mVsinθ / (qB), where m is the mass of the particle, q is the charge of the particle, and B is the magnetic field strength of the uniform magnetic field B. The distance the particle travels per revolution is called the pitch, represented by H: H = Vz*T = πmvcosθ / (qB), where T is the time required for the particle to complete one revolution, known as the rotation period, T = πm / qB. When a beta-ray source is placed in a uniform magnetic field B, the magnetic field strength remains constant, and all charged particles emitted by the source have the same rotation period, T. When the charged particle beam is emitted from the β-ray radiation source point A with the same velocity V, and the angle θ between the velocity V and the uniform magnetic field B is very small, the magnitude of the component velocity Vz=V*cosθ of each particle along the Z-axis is approximately the same. According to the formula H=Vz*T, it can be concluded that the charged particle beam has a pitch H of approximately the same size.

[0137] The charged particle beams all move in equidistant spirals, each with a different radius of curvature R. However, since the Z-axis velocity component Vz is approximately the same, it can be assumed that the pitch H of all particles is the same. After one rotation period T, all particles reconverge to point A' along different equidistant spiral trajectories. This means that the β-rays are focused at point A', and the β-ray intensity is enhanced. After each rotation period T, all particles converge once on the busbar of the simulated cylinder formed by the equidistant spirals, which means that the β-ray intensity is enhanced. The object under test 3 can be located at or near the focal point.

[0138] By implementing this application, the following beneficial effects are achieved:

[0139] The present application utilizes a magnetic field to magnetically focus or magnetically confine beta rays, thereby making the rays more concentrated and reducing the ray spot, thereby improving measurement accuracy. In addition, it can also suppress scattering and improve the utilization rate of the rays.

[0140] It can be understood that the above embodiments only express some implementation methods of the present application, and their descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the present application. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present application, the above embodiments or technical features can be freely combined, and several deformations and improvements can be made, which all fall within the scope of protection of the present application, that is, the embodiments described in "some embodiments" can be freely combined with any of the above and below embodiments; therefore, all equivalent changes and modifications made to the scope of the claims of the present application should fall within the scope of coverage of the claims of the present application.

Claims

1. A beta ray measuring device, characterized in that: It comprises a beta ray transmitting module (1) for transmitting beta rays and a beta ray receiving module (2) for receiving beta rays; The beta-ray transmitting module (1) and the beta-ray receiving module (2) are arranged opposite to each other with a gap therebetween; The beta-ray transmitting module (1) and / or the beta-ray receiving module (2) form a magnetic field, wherein there are constrained magnetic flux lines in the magnetic field, and the direction of the constrained magnetic flux lines is from the beta-ray transmitting module (1) to the beta-ray receiving module (2) or from the beta-ray receiving module (2) to the beta-ray transmitting module (1), and the constrained magnetic flux lines pass through the gap.

2. The beta ray measuring device according to claim 1, characterized in that The beta ray emission module (1) comprises a first magnetic plate (11a), a first shielding cover (12a) and a first beta ray radiation source (13a); The first shielding cover (12a) has a first accommodating cavity (121a), the first accommodating cavity (121a) has a first radiation port (122a), the first beta-ray radiation source (13a) is accommodated in the first accommodating cavity (121a), and beta rays are emitted from the first radiation port (122a); The first magnetic plate (11a) is located on one side of the first shielding cover (12a), and the first magnetic plate (11a) faces away from the first radiation port (122a); And / or, the beta ray receiving module (2) comprises a first ray receiver (21a) and a second magnetic plate (22a); Wherein, the receiving port of the first ray receiver (21a) is opposite to the beta ray emission module (1); The second magnetic plate (22a) is located on one side of the first ray receiver (21a), and the second magnetic plate (22a) faces away from the receiving port of the first ray receiver (21a).

3. The beta ray measuring device according to claim 2, characterized in that: The first magnetic plate (11a) and the second magnetic plate (22a) are of the same size.

4. The beta ray measuring device according to claim 1, characterized in that The beta ray emission module (1) comprises a first current-carrying coil (11b), a second shielding cover (12b) and a second beta ray radiation source (13b); The second shielding cover (12b) has a second accommodating cavity (121b), the second accommodating cavity (121b) has a second radiation port (122b), the second beta-ray radiation source (13b) is accommodated in the second accommodating cavity (121b), and beta rays are emitted from the second radiation port (122b); The first current-carrying coil (11b) surrounds the outside of the second shielding cover (12b); or, the first current-carrying coil (11b) is located at the second radiation port (122b) and surrounds the opening direction of the second radiation port (122b); And / or, the beta ray receiving module (2) includes a second ray receiver (21b) and a second current-carrying coil (22b); Wherein, the receiving port of the second ray receiver (21b) is opposite to the beta ray emission module (1); The second current-carrying coil (22b) surrounds the outside of the second ray receiver (21b); or, the second current-carrying coil (22b) is located at the receiving port and surrounds the opening direction of the receiving port.

5. The beta ray measuring device according to claim 4, characterized in that The first current-carrying coil (11b) and the second current-carrying coil (22b) are of the same size.

6. The beta ray measuring device according to claim 5, characterized in that The first current-carrying coil (11b) and the second current-carrying coil (22b) are coaxial and parallel to each other on a plane, and the distance between the first current-carrying coil (11b) and the second current-carrying coil (22b) is less than or equal to the radius of the first current-carrying coil (11b).

7. The beta ray measuring device according to claim 1, characterized in that The beta ray emission module (1) comprises a first magnetic ring (11c), a third shielding cover (12c) and a third beta ray radiation source (13c); The third shielding cover (12c) comprises a third accommodating cavity (121c), the third accommodating cavity (121c) comprises a third radiation port (122c), the third beta-ray radiation source (13c) is accommodated in the third accommodating cavity (121c), and beta rays are emitted from the third radiation port (122c); The first magnetic ring (11c) surrounds the outside of the third shielding cover (12c); or, the first magnetic ring (11c) is located at the third radiation port (122c) and surrounds the opening direction of the third radiation port (122c); And / or, the beta ray receiving module (2) includes a third ray receiver (21c) and a second magnetic ring (22c); Wherein, the receiving port of the third ray receiver (21c) is opposite to the beta ray emission module (1); The second magnetic ring (22c) surrounds the outside of the third ray receiver (21c); or, the second magnetic ring (22c) is located at the receiving port and surrounds the opening direction of the receiving port.

8. The beta ray measuring device according to claim 7, characterized in that The first magnetic ring (11c) and the second magnetic ring (22c) are of the same size.

9. The beta ray measuring device according to claim 8, characterized in that The first magnetic ring (11c) and the second magnetic ring (22c) are coaxial and parallel to each other on a plane, and the distance between the first magnetic ring (11c) and the second magnetic ring (22c) is less than or equal to the radius of the first magnetic ring (11c).

10. The beta ray measuring device according to claim 2, 4 or 7, characterized in that: The first magnetic plate (11a) and the second magnetic plate (22a) are made of the same material, or the first current-carrying coil (11b) and the second current-carrying coil (22b) are made of the same material, or the first magnetic ring (11c) and the second magnetic ring (22c) are made of the same material.

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