Radioactive sources for thickness measuring devices

Abstract

The present disclosure provides a radioactive source for a thickness measuring device, comprising: a box body having a housing and an exit window, the housing chamber being used to accommodate beta radioactive gas; a collimating portion disposed in the box body and forming a plurality of exit channels arranged at intervals, the exit channels being conductive along a first direction, and the exit window covering one end of the exit channels; and an electric field generating portion disposed in the box body, for forming an electric field in the housing chamber; wherein the direction of the electric field is parallel to the first direction and is directed from the exit window into the housing chamber. The radioactive source can utilize the collimating portion to filter beta rays emitted from the housing chamber toward the exit window or emitted through the exit window, allowing some beta rays with a direction highly consistent with the first direction to be emitted out of the box body through the exit channel and the exit window to participate in the thickness measurement of the object to be measured, thereby improving the collimation of the emitted beta rays and enhancing the measurement accuracy of the thickness measuring device.

Description

Technical Field

[0001] The present disclosure relates to the field of measurement technology, and in particular to a radioactive source for a thickness measuring device. Background Art

[0002] In beta-ray thickness measurement, the measurement accuracy of a beta-ray thickness gauge is often positively correlated with the intensity of the beta rays emitted by the gauge, and beta collimation can affect thickness uniformity measurements. However, due to the high divergence of the beta rays produced by a beta-radiation source, controlling the collimation of the emitted beta rays is difficult when the beta-ray thickness gauge emits the rays over a large emission area. Furthermore, using traditional collimation methods can easily lead to a decrease in beta-ray intensity, affecting measurement accuracy and limiting the widespread application of beta-ray thickness measurement technology. Summary of the Invention

[0003] The present disclosure aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] In view of this, according to an embodiment of the present disclosure, a radioactive source for a thickness measuring device is proposed, comprising:

[0005] The box body has a receiving cavity and an exit window, wherein the receiving cavity is used to receive the β radioactive gas;

[0006] The collimating portion is provided on the box body and is formed with a plurality of exit channels arranged at intervals, the exit channels are connected along a first direction, and the exit window covers one end of the exit channel;

[0007] An electric field generating portion, disposed in the box body, for forming an electric field in the accommodating cavity;

[0008] The direction of the electric field is parallel to the first direction and points from the exit window to the accommodation cavity.

[0009] In a feasible embodiment, the collimating portion includes:

[0010] A plurality of grid plates are provided at the exit window. The grid plates extend along a first direction. The plurality of grid plates are arranged in an array. An exit channel is formed between two adjacent grid plates.

[0011] In a feasible embodiment, the grid is made of aluminum alloy or titanium, and the thickness of the grid is greater than or equal to 0.5 mm.

[0012] In a feasible embodiment, the exit window is in a strip shape, and a plurality of grid plates are arranged in an array along the length direction of the exit window.

[0013] In a feasible embodiment, along the length direction of the exit window, the distance between two adjacent grid plates is greater than or equal to 0.5 cm and less than or equal to 1.5 cm; and / or

[0014] The length of the grid along the first direction is less than or equal to 1.5 cm.

[0015] In a feasible implementation manner, the electric field generating unit includes:

[0016] The electrode plate is disposed in the accommodating cavity, the electrode plate extends along a second direction, the second direction is perpendicular to the first direction, and the alignment portion and the electrode plate are spaced apart along the first direction;

[0017] The power supply is electrically connected to the electrode plate and is used to provide voltage to the electrode plate so as to form an electric field between the electrode plate and the exit window.

[0018] In a feasible embodiment, the box body further comprises a support wall, the support wall and the exit window are arranged opposite to each other along the first direction, and the electrode plate is arranged on the support wall;

[0019] Along the first direction, a first distance between the electrode plate and the exit window is greater than a second distance between the electrode plate and the support wall.

[0020] In a feasible implementation manner, the second distance is less than or equal to 4 mm.

[0021] In a feasible implementation manner, the electric field generating unit further includes:

[0022] a first insulating member connected between the electrode plate and the exit window;

[0023] The second insulating member is connected between the electrode plate and the supporting wall.

[0024] In a feasible implementation manner, the electric field generating unit further includes:

[0025] The conductor is passed through the box body, and the conductor is sealed and connected to the box body;

[0026] The power supply is arranged outside the box body, and the electrode plate is electrically connected to the power supply through a conductor.

[0027] The above description is only an overview of the technical solution provided by the present disclosure. In order to more clearly understand the technical means of the present disclosure, it can be implemented in accordance with the contents of the specification. In order to make the above and other features and effects of the present disclosure more obvious and easy to understand, the implementation methods of the present disclosure are specifically listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the exemplary embodiments below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present disclosure. Throughout the drawings, like reference symbols denote like parts. In the drawings:

[0029] Figure 1A schematic structural diagram of a radioactive source for a thickness measuring device according to an embodiment of the present disclosure;

[0030] Figure 2 A schematic structural diagram of a radioactive source for a thickness measuring device according to another embodiment of the present disclosure.

[0031] in, Figure 1 and Figure 2 The corresponding relationship between the reference numerals and component names is as follows:

[0032] 100 box body; 200 collimation part; 300 electric field generating part;

[0033] 110 exit window; 120 support wall;

[0034] 210 grid plate;

[0035] 310 electrode plate; 320 power supply member; 330 first insulating member; 340 second insulating member; 350 conductor member;

[0036] 101 accommodating chamber; 201 exit channel. DETAILED DESCRIPTION

[0037] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0038] like Figure 1 As shown, according to an embodiment of the present disclosure, a radioactive source for a thickness measuring device is proposed, including: a box body 100, having a accommodating cavity 101 and an exit window 110, the accommodating cavity 101 is used to accommodate β radioactive gas; a collimating portion 200, arranged in the box body 100, and forming a plurality of exit channels 201 arranged at intervals, the exit channels 201 are conductive along a first direction, and the exit window 110 covers one end of the exit channel 201; an electric field generating portion 300, arranged in the box body 100, and used to form an electric field in the accommodating cavity 101; wherein the direction of the electric field is parallel to the first direction, and is directed from the exit window 110 to the accommodating cavity 101.

[0039] The radioactive source for the thickness measuring device provided in the embodiment of the present disclosure includes the aforementioned box body 100, the aforementioned collimating part 200 and the aforementioned electric field generating part 300. The aforementioned box body 100 has a accommodating cavity 101 and an exit window 110. In actual application, the aforementioned accommodating cavity 101 can be filled with β radioactive gas to utilize the aforementioned β radioactive gas as a radiation source of β rays. The aforementioned β radioactive gas can emit β rays in multiple directions. The aforementioned collimating part 200 is arranged in the box body 100, and the collimating part 200 is formed with a plurality of exit channels 201 that are conductive along a first direction. One end of the exit channel 201 is covered by the aforementioned exit window 110. The collimating part 200 can be located inside the accommodating cavity 101 or outside the accommodating cavity 101; wherein, as Figure 1 As shown, when the collimating portion 200 is located in the accommodating cavity, among the aforementioned β rays in multiple directions, at least part of the β rays directed toward the aforementioned exit window 110 are likely to preferentially pass through the aforementioned collimating portion 200, and the portion of the β rays that have passed through the aforementioned collimating portion 200 and have a direction that is more consistent with the aforementioned first direction are likely to pass through the aforementioned exit channel 201 and further be directed toward the aforementioned exit window 110, and then be directed toward the outside of the box body 100 through the aforementioned exit window 110, while the portion of the β rays that have passed through the aforementioned collimating portion 200 and have a direction that deviates greatly from the aforementioned first direction are likely to be directed into the physical portion of the collimating portion 200 and then be intercepted or absorbed by the physical portion of the collimating portion 200; Figure 2 As shown, when the collimating portion 200 is located outside the accommodating cavity 101, among the aforementioned multiple directions of β rays, the β rays emitted from the box body 100 through the exit window 110 can further pass through the collimating portion 200, and the portion of the β rays passing through the collimating portion 200 whose direction is highly consistent with the aforementioned first direction can easily pass through the aforementioned exit channel 201 and further be emitted to the outside, while the portion of the β rays passing through the collimating portion 200 whose direction deviates greatly from the aforementioned first direction can easily enter the solid portion of the collimating portion 200 and be intercepted or absorbed by the solid portion of the collimating portion 200. Based on this, it can be ensured that the direction of the β rays emitted from the box body 100 maintains a high degree of consistency with the aforementioned first direction, which can improve the collimation of the β rays emitted by the radiation source of the thickness measuring device, which is conducive to improving the measurement accuracy of the thickness measuring device, and facilitating the increase of the β-ray exit area of ​​the β-ray thickness measuring device, thereby expanding the detection range of the thickness measuring device and facilitating the expansion of the application range of the β-ray-based thickness measuring device.

[0040] The electric field generating unit 300 is disposed in the housing 100 and is used to form an electric field in a certain direction within the accommodating chamber 101. The direction of the electric field is parallel to the first direction and is directed from the exit window 110 into the accommodating chamber 101. Since beta particles are generally negatively charged, the radioactive source for the thickness measuring device can utilize the electric field to exert an electric field force on the beta particles within the accommodating chamber 101 that is parallel to the first direction and directed from within the accommodating chamber 101 toward the exit window 110, thereby causing the beta particles to move in the first direction. This can, on the one hand, reduce absorption of beta rays within the accommodating chamber 101 and loss of beta rays in the collimating unit 200, thereby improving the beta ray emission rate and emission speed of the thickness measuring device and enhancing the beta ray intensity emitted by the radioactive source for the thickness measuring device. On the other hand, the electric field generating unit 300 can cooperate with the collimating unit 200 to further improve the collimation of the beta rays emitted by the thickness measuring device.

[0041] It should be noted that Figure 1 The center direction line F1 is used to schematically represent the aforementioned first direction, the direction line F2 is used to schematically represent the second direction perpendicular to the aforementioned first direction, and the dotted line with an arrow is used to schematically represent the direction of the aforementioned electric field.

[0042] It should be noted that, in practical applications, the radioactive source used in the thickness measuring device provided in the embodiment of the present disclosure can be used to perform non-destructive thickness measurement of the object to be measured. For example, it can be used to monitor the coating density of the electrode material on the substrate of a lithium battery.

[0043] It should be noted that when using beta rays for thickness measurement, measurements obtained with beta rays incident perpendicularly to the object are often more accurate, while measurements obtained with beta rays less perpendicular to the object often have larger errors. Therefore, in practical applications, high requirements are placed on the collimation of the beta rays output by beta-ray thickness gauges. However, the beta rays emitted by a beta source are relatively divergent, making it more difficult to control the collimation when the beta-ray thickness gauge is directed to emit the rays over a larger output area. This makes it difficult for beta-ray thickness gauges to perform thickness measurements on large areas of the object being measured, limiting the widespread application of beta-ray thickness measurement technology. The radioactive source for the thickness measuring device provided by the embodiment of the present disclosure is based on the above-mentioned setting. On the one hand, the above-mentioned collimating portion 200 can be used to screen the beta rays emitted from the accommodating cavity 101 toward the exit window 110 or the beta rays emitted through the exit window 110, so that some of the beta rays in multiple directions with a direction that is highly consistent with the above-mentioned first direction can be emitted out of the box body 100 through the exit channel 201 and the exit window 110 to participate in the thickness measurement of the object to be measured, and intercept some of the beta rays with a direction that deviates greatly from the above-mentioned first direction, thereby improving the accuracy of the beta rays emitted by the radioactive source for the thickness measuring device. collimation, thereby improving the measurement accuracy of the aforementioned thickness measuring device and facilitating the expansion of the emission area of ​​the radiation source used in the thickness measuring device; on the other hand, the aforementioned electric field generating unit 300 can also be used to apply an electric field force to the beta particles in the accommodating cavity 101. The direction of the aforementioned electric field force is parallel to the aforementioned first direction and points from the aforementioned accommodating cavity 101 to the aforementioned emission window 110, so that the movement direction of the beta particles tends to the aforementioned first direction, thereby increasing the number of beta rays that can pass through the aforementioned emission channel 201, reducing the absorption phenomenon of beta sources in the accommodating cavity 101, and improving the beta ray emission rate of the aforementioned thickness measuring device.

[0044] It is understood that the aforementioned box body 100 is a sealed box structure, thereby preventing the loss of the aforementioned beta radioactive gas. In practical applications, the aforementioned box body 100 may include a first box wall and multiple second box walls. The first box wall and the multiple second box walls enclose the aforementioned accommodating chamber 101, and the thickness of the first box wall is less than the thickness of the second box wall, so that the beta rays can be emitted through the first box wall with a smaller thickness. Thus, the aforementioned first box wall can serve as the aforementioned exit window 110. Correspondingly, the thickness of the second box wall is relatively large, so that the beta rays emitted to the second box wall can be intercepted or absorbed by the second box wall. Exemplarily, the thickness of the first box wall can be greater than or equal to 30μm and less than or equal to 50μm, and the first box wall and the second box wall can both be made of titanium.

[0045] It is understood that the exit window 110 has an incident side and an exit side. When the collimating portion 200 is located within the accommodating cavity 101, the incident side covers one end of the exit channel 201. When the collimating portion 200 is located outside the accommodating cavity 101, the exit side covers one end of the exit channel 201. The exit side faces away from the accommodating cavity 101, and both the incident side and the exit side are perpendicular to the first direction. The exit area can be the area of ​​the exit side, or the sum of the areas of the orthographic projections of multiple exit channels 201 on the exit side.

[0046] It is understood that the type of the aforementioned β radioactive gas can be determined in accordance with actual needs, as long as it can emit β rays. For example, the aforementioned β radioactive gas can be, but is not limited to, Kr-85 or tritium or 14 C gaseous compounds or Ar-39, etc.

[0047] It is understood that the amount of beta radioactive gas contained in the aforementioned chamber 101 can be set according to actual needs. For example, the chamber 101 can contain 1 atm-4 atm of Kr-85 at room temperature, with an abundance of approximately 5%.

[0048] It can be understood that the aforementioned collimating portion 200 has a solid portion and a channel portion, wherein the channel portion includes the plurality of aforementioned exit channels 201 , and the solid portion is a solid structure surrounding the aforementioned channel portion.

[0049] It can be understood that the direction of the aforementioned electric field is parallel to the first direction, and is limited by the exit window 110 pointing to the inside of the accommodating cavity 101, which is only used to constrain the direction of the aforementioned electric field, and does not serve as a limitation on the distribution range of the electric field; accordingly, the aforementioned electric field can be distributed in the entire accommodating cavity 101, or distributed in part of the accommodating cavity 101.

[0050] like Figure 1 As shown, in some examples, the collimating portion 200 includes: a plurality of grid plates 210 disposed on the exit window 110 , the grid plates 210 extending along a first direction, the plurality of grid plates 210 arranged in an array, and an exit channel 201 formed between two adjacent grid plates 210 .

[0051] In this technical solution, the collimating portion 200 may include a plurality of the aforementioned grid plates 210. Based on the aforementioned arrangement, on the one hand, one end of the exit channel 201 may be relatively close to the exit window 110, so that the beta rays emitted toward the aforementioned exit window 110 through the exit channel 201 can easily and quickly pass through the exit window 110 and be emitted out of the box body 100, thereby reducing the risk of the beta rays emitted by the exit channel 201 deviating from their direction. On the other hand, the structural regularity of the collimating portion 200 and the uniformity of the distribution of the plurality of exit channels 201 may be improved, thereby facilitating the improvement of the uniformity of the beta rays emitted by the aforementioned thickness measuring device and enhancing the measurement effect of the aforementioned thickness measuring device. On the other hand, the structural volume and weight of the collimating portion 200 may also be reduced, thereby ensuring the lightweight level of the radiation source for the thickness measuring device.

[0052] It is understood that the grid plate 210 may be directly connected to the exit window 110 or indirectly connected to the exit window 110. For example, an insulating ceramic sheet may be provided between the side of the box body 100 where the exit window 110 is formed and the grid plate 210. The insulating ceramic sheet may be, but is not limited to, an alumina insulating ceramic sheet, so that the withstand voltage of the insulating ceramic sheet is above 3000V.

[0053] Exemplarily, the array range of the plurality of grating plates 210 is adapted to the distribution range of the exit window 110. For example, when the exit window 110 is substantially in the shape of a rectangular plate, the plurality of grating plates 210 may be arranged in an array along the length direction and / or the width direction of the exit window 110. When the plurality of grating plates 210 are arranged in an array along the length direction of the exit window 110, the length of the array range of the plurality of grating plates 210 may be consistent with the length of the exit window 110. When the plurality of grating plates 210 are arranged in an array along the width direction of the exit window 110, the width of the array range of the plurality of grating plates 210 may be consistent with the width of the exit window 110. When the plurality of grating plates 210 are arranged in an array along the length and width directions of the exit window 110, the length of the array range of the plurality of grating plates 210 may be consistent with the length of the exit window 110, and the width of the array range of the plurality of grating plates 210 may be consistent with the width of the exit window 110. Therefore, the coverage of the exit window 110 by the collimating portion 200 can be ensured, and the probability of the β-ray being emitted in a direction deviating from the first direction can be reduced.

[0054] like Figure 1 As shown, in some examples, the grid plate 210 is made of aluminum alloy or titanium, and the thickness H of the grid plate 210 is greater than or equal to 0.5 mm.

[0055] In this technical solution, the thickness H and material of the aforementioned grid 210 are constrained; based on the aforementioned settings, the grid 210's absorption performance for β particles can be improved, thereby facilitating the grid 210 to absorb β rays that deviate from the first direction, which is beneficial to enhancing the collimation effect of the collimating portion 200 on β rays. In addition, the atomic numbers of aluminum alloy and titanium are relatively low, so the bremsstrahlung intensity generated by the grid 210 when interacting with β particles will also be correspondingly reduced, which is beneficial to improving the safety of the aforementioned thickness measuring device and reducing the environmental impact of the aforementioned thickness measuring device during use.

[0056] Illustratively, the thickness H of the grid plate 210 may be greater than or equal to 0.5 mm and less than or equal to 1 mm.

[0057] In some examples, the exit window 110 is in a strip shape, and the plurality of grid plates 210 are arranged in an array along the length direction of the exit window 110 .

[0058] In this technical solution, the exit window 110 can be strip-shaped, and the plurality of aforementioned grid plates 210 can be arranged in an array along the length direction of the exit window 110. Based on the aforementioned arrangement, on the one hand, the distribution range of the exit window 110 can be increased, thereby increasing the exit area of ​​the radiation source used in the thickness measuring device and the detection range of the thickness measuring device. On the other hand, the degree of matching between the distribution ranges of the plurality of grid plates 210 and the exit window 110 can also be improved, thereby increasing the coverage rate of the collimating portion 200 on the exit window 110, which is conducive to ensuring the interception effect of the collimating portion 200 on beta rays deviating from the first direction, thereby providing protection for the exit collimation and detection accuracy of the aforementioned thickness measuring device.

[0059] Exemplarily, the box body 100 may be in a strip shape, and the length direction of the exit window 110 is the same as the length direction of the box body 100 .

[0060] In some examples, along the length direction of the exit window 110 , the distance D1 between two adjacent grid plates 210 is greater than or equal to 0.5 cm and less than or equal to 1.5 cm; and / or the length D2 of the grid plates 210 along the first direction is less than or equal to 1.5 cm.

[0061] In this technical solution, the distance D1 between two adjacent grid plates 210 can be set to be greater than or equal to 0.5 cm and less than or equal to 1.5 cm along the length direction of the exit window 110. Based on the above setting, the width of the above-mentioned exit channel 201 can be increased, thereby increasing the exit area of ​​the radioactive source for the thickness measuring device, which is beneficial to improving the β-ray exit rate of the radioactive source for the thickness measuring device, and further improving the detection efficiency of the thickness measuring device.

[0062] In this technical solution, the length D2 of the grid 210 along the first direction can be set to be less than or equal to 1.5 cm. Based on the above setting, the interception range of the grid 210 can be controlled to avoid the distribution range of the grid 210 in the accommodating cavity 101 being too large, so as to leave more space for the electric field to deflect the movement direction of the β particles, thereby facilitating the β-ray emission rate of the radioactive source used in the thickness measuring device, thereby improving the detection efficiency of the thickness measuring device.

[0063] In this technical solution, a distance D1 between two adjacent grid plates 210 can be set to be greater than or equal to 0.5 cm and less than or equal to 1.5 cm along the length direction of the exit window 110, and a length D2 of the grid plate 210 along the first direction can be set to be less than or equal to 1.5 cm. This ensures that the collimating portion 200 can intercept beta rays that deviate from the first direction while ensuring the beta ray emission rate of the radioactive source used in the thickness measuring device, thereby improving the detection efficiency of the thickness measuring device.

[0064] like Figure 1 As shown, in some examples, the electric field generating part 300 includes: a plate 310, which is arranged in the accommodating cavity 101, the plate 310 extends along the second direction, the second direction is perpendicular to the first direction, and the collimating part 200 and the plate 310 are arranged at intervals along the first direction; a power supply 320, which is electrically connected to the plate 310 and is used to provide voltage to the plate 310 so that an electric field is formed between the plate 310 and the exit window 110.

[0065] In this technical solution, the electric field generating unit 300 may include the aforementioned electrode 310 and the aforementioned power supply 320. Based on the aforementioned configuration, when the power supply 320 provides a voltage to the electrode 310, the aforementioned electric field can be formed between the electrode 310 and the aforementioned exit window 110, thereby applying an electric field force parallel to the aforementioned first direction and directed from the aforementioned accommodation chamber 101 toward the aforementioned exit window 110 to the β particles in the accommodation chamber 101, so that the movement direction of the β particles tends to the aforementioned first direction. On the one hand, it can reduce the absorption phenomenon of the β sources in the accommodation chamber 101 and the loss of β rays in the collimating unit 200, improve the β ray emission rate and emission speed of the aforementioned thickness measuring device, and enhance the β intensity emitted by the radioactive source of the thickness measuring device. On the other hand, the electric field generating unit 300 can cooperate with the aforementioned collimating unit 200 to further improve the collimation of the β rays emitted by the aforementioned thickness measuring device.

[0066] It is understandable that the extension direction of the electrode plate 310 refers to the length direction or width direction of the electrode plate 310 .

[0067] It is understandable that the electrode plate 310 may be electrically connected to the negative electrode of the power supply 320 , so that the potential of the electrode plate 310 is lower than the potential of the exit window 110 , thereby forming the aforementioned electric field between the electrode plate 310 and the exit window 110 .

[0068] For example, the box body 100 is grounded via the power supply 320 , thereby improving the safety of the radioactive source for the thickness measuring device.

[0069] For example, the electrode plate 310 may be a solid aluminum sheet or copper sheet, thereby reducing the difficulty of processing the electrode plate 310 and improving the structural strength of the electrode plate 310 while ensuring the electrical performance of the electrode plate 310 .

[0070] For example, the thickness of the electrode plate 310 may be approximately 1 mm, which is beneficial for ensuring the lightweight level of the electrode plate 310 and further beneficial for controlling the overall weight of the radioactive source for the thickness measuring device.

[0071] Illustratively, the input end of the aforementioned power supply 320 is used to connect to a 220V or 12V voltage, and the maximum output voltage is not less than 3000V, so that the power supply 320 can provide a higher voltage to the electrode plate 310, for example, providing a voltage of 1000V, 1200V or 1500V to the electrode plate 310, thereby increasing the intensity of the electric field and the effect on beta particles.

[0072] In some examples, the box body 100 further has a support wall 120, which is arranged opposite to the exit window 110 along a first direction, and the electrode plate 310 is set on the support wall 120; along the first direction, the first distance between the electrode plate 310 and the exit window 110 is greater than the second distance between the electrode plate 310 and the support wall 120.

[0073] In this technical solution, the box body 100 may further include the aforementioned support wall 120, and the aforementioned first distance may be set to be greater than the aforementioned second distance; based on the aforementioned setting, on the one hand, the aforementioned electrode plate 310 may be fixed by the support wall 120, thereby ensuring the installation stability and reliability of the electrode plate 310 in the accommodating cavity 101; on the other hand, the volume of the portion of the accommodating cavity 101 located between the electrode plate 310 and the support wall 120 may also be reduced, thereby allowing more β particles to be located between the electrode plate 310 and the exit window 110, which is beneficial to improving the utilization rate of the β particles in the accommodating cavity 101 and improving the emission rate of the radioactive source used in the thickness measuring device.

[0074] It can be understood that, when the box body 100 includes the aforementioned first box wall and second box wall, at least one of the plurality of second box walls is arranged opposite to the exit window 110 along the first direction, and accordingly, the second box wall is the aforementioned support wall 120 .

[0075] In some examples, the second distance is less than or equal to 4 mm.

[0076] In this technical solution, the aforementioned second distance is constrained; based on the aforementioned setting, the volume of the portion of the accommodating cavity 101 located between the electrode plate 310 and the support wall 120 can be further reduced, so that more β particles are located between the electrode plate 310 and the exit window 110, which is beneficial to improving the utilization rate of the β particles in the accommodating cavity 101 and improving the emission rate of the radioactive source used in the thickness measuring device.

[0077] Exemplarily, the second distance is less than or equal to 4 mm and greater than or equal to 2 mm, so that an insulating material can be disposed between the support wall 120 and the electrode plate 310 .

[0078] Taking the aforementioned second distance of 2 mm, the chamber 101 being filled with 1 atm Kr-85 gas with an abundance of 5%, and the chamber 101 being a rectangular parallelepiped measuring 100 mm × 30 mm × 30 mm, as an example, without the collimating unit 200 placed in the chamber 101 and without the electric field generating unit 300 applying an electric field, the beta-ray emission rate of the thickness measurement device's radiation source at the exit window 110 was 20%, with an average beta-ray emission angle of 41°. When the power supply 320 supplied a voltage of 2000 V to the electrode plate 310 and the collimating unit 200 was not placed, the beta-ray emission rate of the thickness measurement device's radiation source at the exit window 110 was 29%. This indicates that the aforementioned electric field effectively improves the emission rate of the radiation thickness measurement device. With no electric field applied within the housing chamber 101, the collimator 200 was placed outside the housing chamber 101, close to the exit window. The spacing between the grid plates 210 was 2 mm, and the average exit angle of the β-rays was 36°. This shows that the collimator effectively improves the exit collimation of the β-ray thickness measurement device.

[0079] like Figure 1 As shown, in some examples, the electric field generating unit 300 further includes: a first insulating member 330 connected between the electrode plate 310 and the exit window 110 ; and a second insulating member 340 connected between the electrode plate 310 and the support wall 120 .

[0080] In this technical solution, the electric field generating part 300 may include the aforementioned first insulating part 330 and the aforementioned second insulating part 340; based on the aforementioned setting, on the one hand, the box body 100 can support the aforementioned electrode 310 through the aforementioned first insulating part 330 and the second insulating part 340 to ensure the installation stability and reliability of the electrode 310 in the accommodating cavity 101; on the other hand, a certain interval can be formed between the box body 100 and the electrode 310, thereby avoiding the box body 100 from being charged, which is beneficial to improving the safety of the box body 100.

[0081] Exemplarily, the first insulating member 330 and the second insulating member 340 may both be made of insulating ceramics having a withstand voltage greater than or equal to 3000 V, for example, may both be made of alumina insulating ceramics.

[0082] like Figure 1 As shown, in some examples, the electric field generating part 300 further includes: a conductor 350, which is passed through the box body 100, and the conductor 350 is sealed and connected to the box body 100; wherein, the power supply 320 is arranged outside the box body 100, and the electrode 310 is electrically connected to the power supply 320 through the conductor 350.

[0083] In this technical solution, the electric field generating part 300 may also include the aforementioned conductor part 350; based on the aforementioned setting, the control convenience of the power supply part 320 can be improved, the installation difficulty of the power supply part 320 can be reduced, and the airtightness of the box body 100 can be ensured while using the conductor part 350 to connect the power supply part 320 and the electrode plate 310.

[0084] Exemplarily, the aforementioned conductor part 350 may include a metal needle, an insulating layer and a connecting layer, wherein the metal needle is electrically connected between the aforementioned power supply part 320 and the aforementioned electrode plate 310, the aforementioned insulating layer is sleeved on the aforementioned metal needle, the aforementioned connecting layer is sleeved on the aforementioned insulating layer, and the connecting layer passes through and is sealed and welded to the aforementioned box body 100.

[0085] In the present disclosure, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. Terms such as "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; "connected" can mean a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances.

[0086] In the description of the present disclosure, it is to be understood that the terms "up", "down", "left", "right", "front", "back", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction, and therefore, cannot be understood as a limitation on the present disclosure.

[0087] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0088] The above are merely preferred embodiments of the present disclosure and are not intended to limit the present disclosure. Those skilled in the art will readily appreciate that various modifications and variations of the present disclosure are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present disclosure shall be included within the scope of protection of the present disclosure.

Claims

1. A radioactive source for a thickness measuring device, characterized in that: include: The box body has a receiving cavity and an exit window, wherein the receiving cavity is used to receive the β-radioactive gas; a collimating portion, disposed on the box body and forming a plurality of exit channels arranged at intervals, the exit channels being open along a first direction, the exit window covering one end of the exit channels, the first direction being a direction from the interior of the accommodating cavity toward the exit window; an electric field generating portion, disposed in the box body, for forming an electric field in the accommodating cavity; Wherein, the direction of the electric field is parallel to the first direction, and is directed from the exit window into the accommodation cavity; The collimating portion comprises: A plurality of grid plates are provided on the exit window, the grid plates extend along the first direction, the plurality of grid plates are arranged in an array, and the exit channel is formed between two adjacent grid plates; The grid plate is made of aluminum alloy or titanium, and the thickness of the grid plate is greater than or equal to 0.5 mm; The exit window is in a strip shape, and a plurality of grid plates are arranged in an array along the length direction of the exit window; Along the length direction of the exit window, the distance between two adjacent grid plates is greater than or equal to 0.5 cm and less than or equal to 1.5 cm; The length of the grid along the first direction is less than or equal to 1.5 cm; The electric field generating unit includes: a plate disposed in the accommodating cavity, the plate extending along a second direction perpendicular to the first direction, the collimating portion and the plate being spaced apart along the first direction; A power supply is electrically connected to the electrode plate and is used to provide voltage to the electrode plate so as to form the electric field between the electrode plate and the exit window.

2. The radioactive source for thickness measurement device according to claim 1, characterized in that: The box body further comprises a support wall, the support wall and the exit window are arranged opposite to each other along the first direction, and the electrode plate is arranged on the support wall; Along the first direction, a first distance between the electrode plate and the exit window is greater than a second distance between the electrode plate and the support wall.

3. The radioactive source for thickness measurement device according to claim 2, characterized in that: The second distance is less than or equal to 4 mm.

4. The radioactive source for thickness measurement device according to claim 2, characterized in that: The electric field generating unit further includes: a first insulating member connected between the electrode plate and the exit window; The second insulating member is connected between the electrode plate and the supporting wall.

5. The radioactive source for a thickness measuring device according to claim 1, wherein: The electric field generating unit further includes: A conductor is provided through the box body, and the conductor is sealed and connected to the box body; The power supply is arranged outside the box body, and the electrode plate is electrically connected to the power supply through the conductor.

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