A device and method for detecting characteristic fluorescence

Abstract

The application provides a characteristic fluorescence detection device, which comprises a shell, a radioactive source and a detector. The shell has a sealed chamber capable of containing a gas medium. The radioactive source is placed in the sealed chamber. Characteristic fluorescence is generated after radioactive particles emitted by the radioactive source interact with the gas medium. The detector is arranged downstream of the radioactive source along the transmission direction of the radioactive particles and is used for receiving the characteristic fluorescence. The characteristic fluorescence detection device can detect the yield of characteristic fluorescence of radioactive particles with different energies in different types of gas medium through the detector, establish a mathematical relationship between the yield of characteristic fluorescence and the activity of the radioactive source, calculate the emission rate of the radioactive particles according to the yield of characteristic fluorescence of the radioactive particles emitted by the radioactive source in a specific gas medium, and thus realize the detection of the activity of the radioactive source. Since the range of the characteristic fluorescence is generally long, the detection distance is improved.

Description

Technical Field

[0001] This application relates to the field of detection technology, and in particular to a detection device and method for characteristic fluorescence. Background Technology

[0002] In the detection of radioactive source activity, taking alpha radioactive sources as an example, an alpha particle is a particle composed of two protons and two neutrons. A radioactive source that emits alpha particles through decay is called an alpha radioactive source. Various detection devices and methods exist to detect the energy of alpha particles and the number of emitted alpha particles. Examples include surface contamination meters, alpha spectrometers, and low-background alpha / beta meters. The principle is to utilize the direct interaction between alpha particles and the detector, or the interaction between alpha particles and the medium, resulting in secondary electrons that interact with the detector, causing a response. By measuring the number of alpha particles, the activity of the alpha radioactive source is reflected.

[0003] Because alpha particles have a short range, detection devices in related technologies need to attach the detector to the surface of the radiation source or within 10 cm; otherwise, it is difficult to detect alpha particles, resulting in a short detection distance. Summary of the Invention

[0004] In view of this, the embodiments of this application aim to provide a detection device and method for characteristic fluorescence to solve the problem of short detection distance for radioactive source activity in related technologies.

[0005] To achieve the above objectives, embodiments of this application provide a detection device for characteristic fluorescence, comprising:

[0006] A housing having a sealed chamber capable of containing a gaseous medium;

[0007] A radioactive source placed in the sealed chamber, the radioactive source being used to emit radioactive particles, the radioactive particles generating characteristic fluorescence after interacting with the gaseous medium;

[0008] A detector, positioned downstream of the radioactive source along the direction of the radioactive particle's propagation, is used to receive the characteristic fluorescence.

[0009] In some embodiments, the radiation source is movably disposed within the sealed chamber; and / or, the detector is disposed at one end of the housing along its length and located outside the sealed chamber.

[0010] In some embodiments, the detection device includes a mounting frame movably disposed within the sealed chamber, and the radiation source is placed on the mounting frame.

[0011] In some embodiments, the detection device includes a guide rail extending along the length of the detection device, and the mounting bracket is disposed on the guide rail and is movable along the extension direction of the guide rail.

[0012] In some embodiments, the detection device includes a filter array disposed between the radiation source and the detector along the direction of transmission of the radioactive particles, the filter array being used to filter out non-characteristic fluorescence.

[0013] In some embodiments, the housing has an air inlet and an air outlet communicating with the sealed chamber; and / or, the housing is made of stainless steel or aluminum alloy.

[0014] In some embodiments, the housing has a sample exchange port communicating with the sealed chamber, and the detection device includes a sealing cover disposed at the sample exchange port.

[0015] Another embodiment of this application provides a characteristic fluorescence detection method, the detection method comprising:

[0016] The radioactive source was placed in a sealed chamber;

[0017] The detector is positioned downstream of the radioactive source, along the direction of transmission of the radioactive particles emitted by the radioactive source.

[0018] The sealed chamber is evacuated, and a gaseous medium is introduced into the sealed chamber.

[0019] The detector measures the yield of characteristic fluorescence produced by the interaction of radioactive particles with the gaseous medium.

[0020] In some embodiments, the detection method further includes:

[0021] The distance between the detector and the radiation source is adjusted to detect the yield of the characteristic fluorescence.

[0022] In some embodiments, the detection method further includes:

[0023] Replace the radiation source and detect the yield of the characteristic fluorescence.

[0024] In some embodiments, the detection method further includes:

[0025] The gas medium was changed, and the yield of the characteristic fluorescence was detected.

[0026] In some embodiments, after the step of detecting the yield of characteristic fluorescence produced by the interaction of radioactive particles with the gaseous medium by a detector, the method further includes:

[0027] The characteristic fluorescence is filtered by a filter array.

[0028] In some embodiments, prior to the step of filtering the characteristic fluorescence through a filter array, the following steps are included:

[0029] The characteristic fluorescence is focused by a condenser lens group having at least one condenser lens.

[0030] In some embodiments, the mathematical relationship between the yield of the characteristic fluorescence and the activity of the radioactive source is as follows:

[0031]

[0032] In the formula:

[0033] N C The count of characteristic fluorescence detected by the detector;

[0034] Q e For detector quantum efficiency;

[0035] A represents the receiving area of ​​the characteristic fluorescence;

[0036] r sphere This is the distance from the radiation source to the spherical surface of the condenser lens assembly;

[0037] T w The characteristic fluorescence transmittance of the condenser lens group;

[0038] T f The characteristic fluorescence transmittance of the filter group;

[0039] N α Emissivity of radioactive particles;

[0040] E γ The energy of the characteristic fluorescent photon;

[0041] E α Energy of radioactive particles;

[0042] f e The conversion efficiency is the characteristic fluorescence.

[0043] The characteristic fluorescence detection device provided in this application includes a housing, a radioactive source, and a detector. The housing has a sealed chamber that can contain a gaseous medium. The radioactive source is placed in the sealed chamber and emits radioactive particles. After the radioactive particles interact with the gaseous medium, characteristic fluorescence is generated. Along the transmission direction of the radioactive particles, the detector is located downstream of the radioactive source and is used to receive the characteristic fluorescence. First, the radioactive particles emitted by the radioactive source interact with the gaseous medium to generate characteristic fluorescence. The detector detects the yield of the characteristic fluorescence. That is, the characteristic fluorescence detection device of this application can detect the yield of characteristic fluorescence of radioactive particles of different energies in different types of gaseous media by the detector, establish a mathematical relationship between the yield of characteristic fluorescence and the activity of the radioactive source. Based on this mathematical relationship between the yield of characteristic fluorescence and the activity of the radioactive source, and according to the yield of characteristic fluorescence of the radioactive particles emitted by the radioactive source in a specific gaseous medium, the emissivity of the radioactive particles can be calculated, thereby realizing the detection of the activity of the radioactive source. In addition, since the range of characteristic fluorescence is generally long, reaching the meter level, the intensity of characteristic fluorescence can be detected at a relatively long distance from the radiation source. This means that the activity of the radiation source can be detected at a relatively long distance from the radiation source, thereby increasing the detection distance and reducing the radiation received by the detection personnel when detecting the activity of the radiation source in a strong radiation environment. This can effectively ensure the safety of the detection personnel and the environment. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the structure of a characteristic fluorescence detection device in one embodiment of this application;

[0045] Figure 2 This is a schematic diagram of a characteristic fluorescence detection method in one embodiment of this application.

[0046] Explanation of reference numerals in the attached figures

[0047] 1. Radioactive source; 2. Detector; 3. Housing; 3a. Sealed chamber; 3b. Air inlet; 3c. Air outlet; 3d. Sample exchange port; 4. Mounting bracket; 5. Guide rail; 6. Filter assembly; 7. Sealing cover; 100. Detection device. Detailed Implementation

[0048] It should be noted that, unless otherwise specified, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed descriptions in the specific implementation should be understood as explanations of the purpose of this application and should not be regarded as undue limitations on this application.

[0049] The directional terms used in the description of this application are for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application.

[0050] Please see Figure 1 This application provides a characteristic fluorescence detection device. The detection device 100 includes a housing 3, a radioactive source 1, and a detector 2. The housing 3 has a sealed chamber 3a, which can be used to contain a gaseous medium. The radioactive source 1 is placed in the sealed chamber 3a and is used to emit radioactive particles. The radioactive particles generate characteristic fluorescence after interacting with the gaseous medium. Along the transmission direction of the radioactive particles, the detector 2 is located downstream of the radioactive source 1 and is used to receive the characteristic fluorescence.

[0051] It should be noted that the specific type of gaseous medium is not limited here, as long as it can interact with radioactive particles and produce characteristic fluorescence. For example, the gaseous medium can be an inert gas such as helium or argon, or it can be air or nitrogen.

[0052] It is understandable that characteristic fluorescence is monochromatic light emitted by the excitation and de-excitation of a gaseous medium such as inert gas molecules, which is beneficial for detector 2 to distinguish characteristic fluorescence. Furthermore, the intensity of the characteristic fluorescence is positively correlated with the energy and number of radioactive particles. Therefore, the activity of radioactive source 1 can be calculated using the intensity of the characteristic fluorescence. For example, by establishing a mathematical relationship between the intensity of the characteristic fluorescence and the activity of radioactive source 1, the activity of radioactive source 1 can be detected by measuring the intensity of the characteristic fluorescence generated by the interaction of radioactive particles with the gaseous medium using detector 2.

[0053] Characteristic fluorescence, for example, is characteristic ultraviolet fluorescence.

[0054] It should be noted that the specific size of the radioactive source 1 is not limited here. For example, the radioactive source 1 is φ25mm×1mm. An appropriately sized radioactive source 1 is more conducive to establishing a mathematical relationship between the intensity of the characteristic fluorescence and the activity of the radioactive source 1.

[0055] Please see Figure 1 The housing 3 has a sealed chamber 3a, which can be used to contain a gaseous medium. By placing the radiation source 1 in the sealed chamber 3a and interacting with the specific gaseous medium in the sealed chamber 3a to generate characteristic fluorescence, the influence of other gaseous media in the environment on the detection results can be avoided to a certain extent.

[0056] It should be noted that the specific type of radioactive source 1 is not limited here. Radioactive source 1 can be, for example, an alpha radioactive source or a beta radioactive source. This application uses an alpha radioactive source as an example for illustration.

[0057] The characteristic fluorescence detection device of this application embodiment can detect the yield of characteristic fluorescence of radioactive particles with different energies in different types of gaseous media through detector 2, establish a mathematical relationship between the yield of characteristic fluorescence and the activity of radioactive source 1, and calculate the emissivity of radioactive particles based on the yield of characteristic fluorescence of radioactive particles emitted by radioactive source 1 in a specific gaseous medium, thereby realizing the detection of the activity of radioactive source 1. In addition, since the range of characteristic fluorescence is generally relatively long, reaching the meter level, the intensity of characteristic fluorescence can be detected at a relatively long distance from radioactive source 1. That is, the activity of radioactive source 1 can be detected at a relatively long distance from radioactive source 1, thereby increasing the detection distance and reducing the radiation received by the detection personnel when detecting the activity of radioactive source 1 in a strong radiation environment, thus effectively ensuring the safety of the detection personnel and the environment.

[0058] In one embodiment, please refer to Figure 1 The radioactive source 1 is movably disposed in the sealed chamber 3a. Thus, by moving the radioactive source 1, the distance between the radioactive source 1 and the detector 2 can be adjusted, thereby enabling the detection of the characteristic fluorescence yield of the radioactive source 1 under different detection distance conditions.

[0059] In one embodiment, please refer to Figure 1 Detector 2 is positioned at one end of the housing 3 along its length and outside the sealed chamber 3a. This allows the distance between the radiation source 1 and detector 2 to be adjusted by moving the radiation source 1 toward or away from detector 2. The placement of detector 2 at one end of the housing 3 along its length facilitates adjustment of the distance between the radiation source 1 and detector 2. Furthermore, the location of detector 2 outside the sealed chamber 3a facilitates adjustment of detector 2.

[0060] In other embodiments, the detector 2 may also be disposed at one end of the housing 3 along the width direction.

[0061] In other embodiments, the detector 2 may also be located inside the sealed chamber 3a, which helps to protect the detector 2 and prevent it from being damaged.

[0062] In one embodiment, please refer to Figure 1 The detection device 100 includes a mounting frame 4 movably disposed in a sealed chamber 3a, and the radiation source 1 is placed on the mounting frame 4. By providing the mounting frame 4, it is convenient to place the radiation source 1, and by movably disposing of the mounting frame 4 in the sealed chamber 3a, the radiation source 1 can be moved by moving the mounting frame 4.

[0063] It should be noted that the specific method of moving the radioactive source 1 is not limited here. For example, in one embodiment, please refer to... Figure 1 The detection device 100 includes a guide rail 5 extending along the length of the detection device 100, and a mounting bracket 4 disposed on the guide rail 5 and capable of moving along the extension direction of the guide rail 5. That is, by setting the guide rail 5 and the mounting bracket 4 disposed on the guide rail 5, the mounting bracket 4 can move along the extension direction of the guide rail 5. The setting of the guide rail 5 is beneficial to controlling the moving distance of the radiation source 1 and can improve the stability of the movement of the radiation source 1.

[0064] The specific structure of the guide rail 5 is not limited here. For example, the guide rail 5 can be formed by connecting lead screws with a lead screw pitch of 3mm-6mm, such as 3mm, 4mm, 5mm or 6mm.

[0065] In other embodiments, the mounting bracket 4 may also be fixedly mounted on the guide rail 5, and the guide rail 5 moves to drive the mounting bracket 4 to move, thereby realizing the movement of the radiation source 1.

[0066] It should be noted that the specific way in which the mounting bracket 4 moves relative to the guide rail 5 is not limited here, including but not limited to moving the mounting bracket 4 by means of a rotating wheel or a motor.

[0067] It should be noted that the specific shape of the shell 3 is not limited here. The shape of the shell 3 includes, but is not limited to, a hollow cylinder, a hollow elliptical cylinder, a hollow frustum, or a polygon with rounded corners, such as a rounded triangle. For example, in one embodiment, the shell 3 is a hollow cylinder with a circular cross-sectional area, which is beneficial to the smooth flow of the gas medium in the sealed chamber 3a.

[0068] The material of the housing 3 is not limited here, but may include, but is not limited to, stainless steel or aluminum alloy.

[0069] In one embodiment, the detection device 100 includes a condenser lens assembly (not shown) with at least one condenser lens. The condenser lens assembly is positioned upstream of the detector 2 along the direction of radioactive particle propagation to focus the divergent characteristic fluorescence. It is understood that the characteristic fluorescence generated by the interaction of radioactive particles with the gaseous medium is emitted in the 4π direction. By positioning the condenser lens assembly, including at least one condenser lens, upstream of the detector 2 (i.e., between the detector 2 and the radiation source 1), along the direction of radioactive particle propagation, to collect and converge the divergent characteristic fluorescence generated by distant radioactive particles, the divergent characteristic fluorescence can be focused to a focal point. This improves the collection efficiency of the detection device 100 for characteristic fluorescence, thereby increasing the detection efficiency and accuracy of the activity detection of the radiation source 1.

[0070] It should be noted that the condenser lens assembly including at least one condenser lens means that the condenser lens assembly can include only one condenser lens. This reduces the cost of the detection device 100 and improves the collection efficiency of the detection device 100 for characteristic fluorescence. The condenser lens assembly can also include multiple condenser lenses. By using multiple condenser lenses, the collection efficiency of the detection device 100 for characteristic fluorescence can be further improved.

[0071] It should be noted that in the embodiments of this application, "multiple" refers to a quantity including two or more.

[0072] In one embodiment, at least one condenser lens has an anti-reflection coating (not shown) on its surface. It should be noted that when the condenser lens assembly has only one condenser lens, the anti-reflection coating is provided on the surface of that condenser lens; when the condenser lens assembly has multiple condenser lenses, the anti-reflection coating is provided on the surface of at least one of the multiple condenser lenses.

[0073] As is understandable, antireflective coatings, also known as anti-reflection coatings, primarily function to reduce or eliminate reflected light from optical surfaces such as condenser lenses, thereby increasing the light transmittance of the condenser lenses and reducing or eliminating stray light in the system. In other words, the application of antireflective coatings not only increases the transmittance of characteristic fluorescence but also reflects stray light from other wavelengths, thus improving the detection efficiency and accuracy of characteristic fluorescence.

[0074] In one embodiment, please refer to Figure 1 The detection device 100 includes a filter group 6, which is positioned between the radiation source 1 and the detector 2 along the direction of radioactive particle transport. The filter group 6 is used to filter non-characteristic fluorescence. It is understood that by positioning the filter group 6 between the radiation source 1 and the detector 2 along the direction of radioactive particle transport, characteristic fluorescence is filtered out; that is, the filter group 6 filters out stray light of other wavelengths, allowing only characteristic fluorescence of the characteristic wavelength to pass through. This further reduces or eliminates stray light in the system, thereby further improving the detection efficiency and accuracy of characteristic fluorescence. Non-characteristic fluorescence here refers, for example, stray light of other wavelengths.

[0075] It should be noted that the filter group 6 includes at least one filter, meaning that the filter group 6 can include only one filter. This reduces the cost of the detection device 100 and also reduces or eliminates stray light from the system. The filter group 6 can also include multiple filters. By using multiple filters, stray light from the system can be further reduced or eliminated.

[0076] In one embodiment, please refer to Figure 1The housing 3 has an air inlet 3b and an air outlet 3c that communicate with the sealed chamber 3a. The detection device 100 can be connected to a gas cylinder through the air inlet 3b and a vacuum pump through the air outlet 3c. The gas medium is then introduced into the sealed chamber 3a through the air inlet 3b and a vacuum is drawn into the sealed chamber 3a through the air outlet 3c, thereby realizing the function of replacing the gas medium.

[0077] In one embodiment, please refer to Figure 1 The shell 3 has a sample exchange port 3d that communicates with the sealed chamber 3a. The radioactive source 1 can be placed or removed through the sample exchange port 3d, and different types and activities of radioactive source 1 can be replaced.

[0078] In one embodiment, please refer to Figure 1 The detection device 100 includes a sealing cover 7, which is located at the sample exchange port 3d and is used to seal the sealed chamber 3a.

[0079] The material of the sealing cover 7 is not limited here. For example, the material of the sealing cover 7 can be the same as that of the housing 3, including but not limited to stainless steel or aluminum alloy.

[0080] The sealing cover 7 can be fixed to the housing 3 with bolts.

[0081] In one embodiment, the detection device 100 includes a silicone gasket seal sandwiched between the sealing cover 7 and the housing 3 to improve the sealing performance between the sealing cover 7 and the side wall of the sample exchange port 3d.

[0082] Please see Figure 2 Another aspect of this application provides a characteristic fluorescence detection method, the detection method including:

[0083] S100. Place the radioactive source in a sealed chamber.

[0084] The detection device 100 includes a housing 3, a radioactive source 1, and a detector 2. The housing 3 has a sealed chamber 3a, which can be used to contain a gaseous medium. The radioactive source 1 is placed in the sealed chamber 3a and is used to emit radioactive particles. After the radioactive particles interact with the gaseous medium, they generate characteristic fluorescence. Along the direction of radioactive particle transmission, the detector 2 is located downstream of the radioactive source 1 and is used to receive the characteristic fluorescence.

[0085] It should be noted that the specific shape of the shell 3 is not limited here. The shape of the shell 3 includes, but is not limited to, a hollow cylinder, a hollow elliptical cylinder, a hollow frustum, or a polygon with rounded corners, such as a rounded triangle. For example, in one embodiment, the shell 3 is a hollow cylinder with a circular cross-sectional area, which is beneficial to the smooth flow of the gas medium in the sealed chamber 3a.

[0086] The material of the housing 3 is not limited here, but may include, but is not limited to, stainless steel or aluminum alloy.

[0087] It should be noted that the specific size of the radioactive source 1 is not limited here. For example, the radioactive source 1 is φ25mm×1mm. An appropriately sized radioactive source 1 is more conducive to establishing a mathematical relationship between the intensity of the characteristic fluorescence and the activity of the radioactive source 1.

[0088] It should be noted that the specific type of radioactive source 1 is not limited here. Radioactive source 1 can be, for example, an alpha radioactive source or a beta radioactive source. This application uses an alpha radioactive source as an example for illustration.

[0089] S200. The detector is positioned downstream of the radioactive source, along the transmission direction of the radioactive particles emitted by the radioactive source.

[0090] The detector 22 is, for example, a photon detector 22 or a photomultiplier tube. The detector 22 is used to receive the characteristic fluorescence transmitted by the front mirror group, convert it into an electrical signal, and obtain the number or intensity of the characteristic fluorescence.

[0091] S300. Evacuate the sealed chamber and fill it with a gaseous medium.

[0092] It should be noted that the specific type of gaseous medium is not limited here, as long as it can interact with radioactive particles and produce characteristic fluorescence. For example, the gaseous medium can be an inert gas such as helium or argon, or it can be air or nitrogen. For ease of detection, the gaseous medium in this embodiment is air.

[0093] Characteristic fluorescence, for example, is characteristic ultraviolet fluorescence.

[0094] S400, Detect the yield of characteristic fluorescence produced by the interaction of radioactive particles with the gaseous medium using a detector.

[0095] It is understandable that characteristic fluorescence is monochromatic light emitted by the excitation and de-excitation of a gaseous medium such as inert gas molecules, which is beneficial for detector 2 to distinguish characteristic fluorescence. Furthermore, the intensity of the characteristic fluorescence is positively correlated with the energy and number of radioactive particles. Therefore, the activity of radioactive source 1 can be calculated using the intensity of the characteristic fluorescence. For example, by establishing a mathematical relationship between the intensity of the characteristic fluorescence and the activity of radioactive source 1, the activity of radioactive source 1 can be detected by measuring the intensity of the characteristic fluorescence generated by the interaction of radioactive particles with the gaseous medium using detector 2.

[0096] The detection principle in related technologies utilizes the direct interaction between radioactive particles and the detector, or the interaction between radioactive particles and the medium, generating secondary electrons that interact with the detector, causing it to respond. The activity of the radioactive source is then reflected by measuring the number of radioactive particles. However, due to the short range of radioactive particles, the detection devices in these technologies need to place the detector directly onto the surface of the radioactive source or within 10 cm; otherwise, it is difficult to detect the radioactive particles. This results in a short detection distance.

[0097] The characteristic fluorescence detection device provided in this application includes a housing 3, a radioactive source 1, and a detector 2. The housing 3 has a sealed chamber 3a, which can be used to contain a gaseous medium. The radioactive source 1 is placed in the sealed chamber 3a and is used to emit radioactive particles. After the radioactive particles interact with the gaseous medium, characteristic fluorescence is generated. Along the transmission direction of the radioactive particles, the detector 2 is located downstream of the radioactive source 1 and is used to receive the characteristic fluorescence. First, the radioactive particles emitted by the radioactive source 1 interact with the gaseous medium to generate characteristic fluorescence. The detector 2 detects the yield of characteristic fluorescence. That is, the characteristic fluorescence detection device 100 of this application can detect the yield of characteristic fluorescence of radioactive particles of different energies in different types of gaseous media through the detector 2, establish a mathematical relationship between the yield of characteristic fluorescence and the activity of the radioactive source 1. Through this mathematical relationship between the yield of characteristic fluorescence and the activity of the radioactive source 1, and based on the yield of characteristic fluorescence of the radioactive particles emitted by the radioactive source 1 in a specific gaseous medium, the emissivity of the radioactive particles can be calculated, thereby realizing the detection of the activity of the radioactive source 1. In addition, since the range of characteristic fluorescence is generally long, reaching the meter level, the intensity of characteristic fluorescence can be detected at a relatively long distance from the radioactive source 1. This means that the activity of the radioactive source 1 can be detected at a relatively long distance from the radioactive source 1, thereby increasing the detection distance and reducing the radiation received by the detection personnel when detecting the activity of the radioactive source 1 in a strong radiation environment, thus effectively ensuring the safety of the detection personnel and the environment.

[0098] In one embodiment, the detection method further includes:

[0099] S500, Adjust the distance between the detector and the radiation source to detect the yield of the characteristic fluorescence.

[0100] In one embodiment, please refer to Figure 1 The radioactive source 1 is movably disposed in the sealed chamber 3a. Thus, by moving the radioactive source 1, the distance between the radioactive source 1 and the detector 2 can be adjusted, thereby enabling the detection of the characteristic fluorescence yield of the radioactive source 1 under different detection distance conditions.

[0101] In one embodiment, please refer to Figure 1Detector 2 is positioned at one end of the housing 3 along its length and outside the sealed chamber 3a. This allows the distance between the radiation source 1 and detector 2 to be adjusted by moving the radiation source 1 toward or away from detector 2. The placement of detector 2 at one end of the housing 3 along its length facilitates adjustment of the distance between the radiation source 1 and detector 2. Furthermore, the location of detector 2 outside the sealed chamber 3a facilitates adjustment of detector 2.

[0102] In other embodiments, the detector 2 may also be disposed at one end of the housing 3 along the width direction.

[0103] In other embodiments, the detector 2 may also be located inside the sealed chamber 3a, which helps to protect the detector 2 and prevent it from being damaged.

[0104] In one embodiment, please refer to Figure 1 The detection device 100 includes a mounting frame 4 movably disposed in a sealed chamber 3a, and the radiation source 1 is placed on the mounting frame 4. By providing the mounting frame 4, it is convenient to place the radiation source 1, and by movably disposing of the mounting frame 4 in the sealed chamber 3a, the radiation source 1 can be moved by moving the mounting frame 4.

[0105] It should be noted that the specific method of moving the radioactive source 1 is not limited here. For example, in one embodiment, please refer to... Figure 1 The detection device 100 includes a guide rail 5 extending along the length of the detection device 100, and a mounting bracket 4 disposed on the guide rail 5 and capable of moving along the extension direction of the guide rail 5. That is, by setting the guide rail 5 and the mounting bracket 4 disposed on the guide rail 5, the mounting bracket 4 can move along the extension direction of the guide rail 5. The setting of the guide rail 5 is beneficial to controlling the moving distance of the radiation source 1 and can improve the stability of the movement of the radiation source 1.

[0106] The specific structure of the guide rail 5 is not limited here. For example, the guide rail 5 can be formed by connecting lead screws with a lead screw pitch of 3mm-6mm, such as 3mm, 4mm, 5mm or 6mm.

[0107] In other embodiments, the mounting bracket 4 may also be fixedly mounted on the guide rail 5, and the guide rail 5 moves to drive the mounting bracket 4 to move, thereby realizing the movement of the radiation source 1.

[0108] It should be noted that the specific way in which the mounting bracket 4 moves relative to the guide rail 5 is not limited here, including but not limited to moving the mounting bracket 4 by means of a rotating wheel or a motor.

[0109] In one embodiment, the detection method further includes:

[0110] S600. Replace the radiation source and detect the yield of the characteristic fluorescence.

[0111] It is understandable that by replacing radioactive sources 1 with different types and activities, the yield of characteristic fluorescence of radioactive sources 1 with different types and activities in a gaseous medium can be detected.

[0112] Specifically, in one embodiment, please refer to Figure 1 The shell 3 has a sample exchange port 3d that communicates with the sealed chamber 3a. The radioactive source 1 can be placed or removed through the sample exchange port 3d, and different types and activities of radioactive source 1 can be replaced.

[0113] In one embodiment, please refer to... Figure 1 The detection device 100 includes a sealing cover 7, which is located at the sample exchange port 3d and is used to seal the sealed chamber 3a.

[0114] The material of the sealing cover 7 is not limited here. For example, the material of the sealing cover 7 can be the same as that of the housing 3, including but not limited to stainless steel or aluminum alloy.

[0115] The sealing cover 7 can be fixed to the housing 3 with bolts.

[0116] In one embodiment, the detection device 100 includes a silicone gasket seal sandwiched between the sealing cover 7 and the housing 3 to improve the sealing performance between the sealing cover 7 and the side wall of the sample exchange port 3d.

[0117] In one embodiment, the detection method further includes:

[0118] S700, Replace the gas medium and detect the yield of the characteristic fluorescence.

[0119] It is understandable that by changing different types of gaseous media, the yield of characteristic fluorescence of radioactive source 1 in different types of gaseous media can be detected.

[0120] Specifically, in one embodiment, please refer to Figure 1 The housing 3 has an air inlet 3b and an air outlet 3c that communicate with the sealed chamber 3a. The detection device 100 can be connected to a gas cylinder through the air inlet 3b and a vacuum pump through the air outlet 3c. The gas medium is then introduced into the sealed chamber 3a through the air inlet 3b and a vacuum is drawn into the sealed chamber 3a through the air outlet 3c, thereby realizing the function of replacing the gas medium.

[0121] In one embodiment, after the step of detecting the yield of characteristic fluorescence produced by the interaction of radioactive particles with the gaseous medium by a detector, the method further includes:

[0122] The characteristic fluorescence is filtered by a filter array.

[0123] In one embodiment, please refer to Figure 1 The detection device 100 includes a filter group 6, which is positioned between the radiation source 1 and the detector 2 along the direction of radioactive particle transport. The filter group 6 is used to filter non-characteristic fluorescence. It is understood that by positioning the filter group 6 between the radiation source 1 and the detector 2 along the direction of radioactive particle transport, characteristic fluorescence is filtered out; that is, the filter group 6 filters out stray light of other wavelengths, allowing only characteristic fluorescence of the characteristic wavelength to pass through. This further reduces or eliminates stray light in the system, thereby further improving the detection efficiency and accuracy of characteristic fluorescence. Non-characteristic fluorescence here refers, for example, stray light of other wavelengths.

[0124] It should be noted that the filter group 6 includes at least one filter, meaning that the filter group 6 can include only one filter. This reduces the cost of the detection device 100 and also reduces or eliminates stray light from the system. The filter group 6 can also include multiple filters. By using multiple filters, stray light from the system can be further reduced or eliminated.

[0125] In one embodiment, prior to the step of filtering the characteristic fluorescence using a filter array, the following steps are included:

[0126] The characteristic fluorescence is focused by a condenser lens group having at least one condenser lens.

[0127] In one embodiment, the detection device 100 includes a condenser lens assembly (not shown) with at least one condenser lens. The condenser lens assembly is positioned upstream of the detector 2 along the direction of radioactive particle propagation to focus the divergent characteristic fluorescence. It is understood that the characteristic fluorescence generated by the interaction of radioactive particles with the gaseous medium is emitted in the 4π direction. By positioning the condenser lens assembly, including at least one condenser lens, upstream of the detector 2 (i.e., between the detector 2 and the radiation source 1), along the direction of radioactive particle propagation, to collect and converge the divergent characteristic fluorescence generated by distant radioactive particles, the divergent characteristic fluorescence can be focused to a focal point. This improves the collection efficiency of the detection device 100 for characteristic fluorescence, thereby increasing the detection efficiency and accuracy of the activity detection of the radiation source 1.

[0128] It should be noted that the condenser lens assembly including at least one condenser lens means that the condenser lens assembly can include only one condenser lens. This reduces the cost of the detection device 100 and improves the collection efficiency of the detection device 100 for characteristic fluorescence. The condenser lens assembly can also include multiple condenser lenses. By using multiple condenser lenses, the collection efficiency of the detection device 100 for characteristic fluorescence can be further improved.

[0129] It should be noted that in the embodiments of this application, "multiple" refers to a quantity including two or more.

[0130] In one embodiment, at least one condenser lens has an anti-reflection coating (not shown) on its surface. It should be noted that when the condenser lens assembly has only one condenser lens, the anti-reflection coating is provided on the surface of that condenser lens; when the condenser lens assembly has multiple condenser lenses, the anti-reflection coating is provided on the surface of at least one of the multiple condenser lenses.

[0131] As is understandable, antireflective coatings, also known as anti-reflection coatings, primarily function to reduce or eliminate reflected light from optical surfaces such as condenser lenses, thereby increasing the light transmittance of the condenser lenses and reducing or eliminating stray light in the system. In other words, the application of antireflective coatings not only increases the transmittance of characteristic fluorescence but also reflects stray light from other wavelengths, thus improving the detection efficiency and accuracy of characteristic fluorescence.

[0132] In one embodiment, the mathematical relationship between the yield of the characteristic fluorescence and the activity of the radioactive source is as follows:

[0133]

[0134] In the formula:

[0135] N C The count of characteristic fluorescence detected by detector 2;

[0136] Q e For detector 2 quantum efficiency;

[0137] A represents the receiving area of ​​the characteristic fluorescence;

[0138] r sphere The distance from radiation source 1 to the spherical surface of the condenser lens group;

[0139] T w The characteristic fluorescence transmittance of the condenser lens group;

[0140] T f The characteristic fluorescence transmittance of filter group 6;

[0141] N α Emissivity of radioactive particles;

[0142] E γ Characteristic fluorescent photon energy;

[0143] E α Energy of radioactive particles;

[0144] f e The conversion efficiency is the characteristic fluorescence.

[0145] Taking radioactive source 1 as an example of an alpha radioactive source, the long-distance detection method for an alpha radioactive source involves detecting the activity of the alpha radioactive source by measuring the intensity of its characteristic ultraviolet fluorescence. The intensity of the characteristic fluorescence detected by the photon detector 2 is related to factors such as the type of radioactive source 1, i.e., the energy of the alpha particles, the activity of the alpha radioactive source, the detection distance, and the photon measurement efficiency. The detection device 100 of this application can accurately detect the fluorescence yield of characteristic ultraviolet fluorescence produced by the interaction of alpha particles of different energies with inert gases such as nitrogen and helium. This provides basic data support for establishing a mathematical relationship between the characteristic fluorescence intensity and the activity of radioactive source 1. For example, by detecting the fluorescence yield of characteristic ultraviolet fluorescence produced by the interaction of alpha particles of different energies with inert gases such as nitrogen and helium, the conversion efficiency f of the characteristic fluorescence under different experimental conditions can be calculated. e wait.

[0146] A photon detector 2 and an alpha radiation source are placed in a sealed chamber 3a, with the active areas of the photon detector 2 and the alpha radiation source at the same horizontal level. The radiation source 1 is fixed by a mounting bracket 4, which is mounted on a guide rail 5 and can be moved left and right to change the distance between the radiation source 1 and the detector 2. The sealed chamber 3a has a sample change port 3d, allowing for the replacement of alpha radiation sources of different types and activities. An inlet 3b is connected to a gas cylinder to fill the sealed chamber 3a with a gaseous medium, and an outlet 3c is connected to a vacuum pump to evacuate the interior of the sealed chamber 3a, thus enabling gas medium replacement. The photon detector 2 is used to detect the characteristic ultraviolet fluorescence produced by the interaction between the alpha radiation source and the gaseous medium. By changing parameters such as the radiation source 1, the gaseous medium, and the detection distance, the fluorescence yield of alpha particles in the gaseous medium can be accurately detected.

[0147] To address the short detection range of alpha radiation sources in existing technologies, this invention characterizes the activity of alpha radiation sources by detecting the characteristic ultraviolet fluorescence generated by the interaction of alpha particles with inert gases. Since the characteristic ultraviolet fluorescence is monochromatic light emitted by the excitation and de-excitation of inert gas molecules, it is advantageous for detector 2 to distinguish the characteristic ultraviolet fluorescence. Furthermore, the intensity of the generated characteristic ultraviolet fluorescence is positively correlated with the energy and number of alpha particles, allowing the activity of the alpha radiation source to be calculated using the intensity of the characteristic ultraviolet fluorescence. To establish the mathematical relationship between the intensity of the characteristic ultraviolet fluorescence and the activity of the alpha radiation source, it is necessary to accurately detect the characteristic ultraviolet fluorescence yield of alpha particles with different energies in different types of inert gases.

[0148] The detection device 100 and detection method of this application use the yield of characteristic fluorescence to calculate the activity of radioactive source 1. The detector 2 detects the characteristic fluorescence generated by the interaction of radioactive source 1 with the gas medium. By changing parameters such as radioactive source 1, gas medium, and detection distance, the detector 2 detects the fluorescence yield of different types and activities of radioactive source 1 in different types of gas media at different detection distances. Then, a mathematical relationship between the yield of characteristic fluorescence and the activity of radioactive source 1 is established. According to the mathematical relationship between the yield of characteristic fluorescence and the activity of radioactive source 1, the intensity of characteristic fluorescence generated by the interaction of radioactive particles with the gas medium can be detected by the detector 2, and the activity of radioactive source 1 can be calculated.

[0149] During the detection of the activity of radioactive source 1, the characteristic fluorescence N detected by detector 2 is first counted. C Substituting into the above mathematical formula, we can obtain the radioactive particle emissivity N. α The activity of radioactive source 1 is calculated accordingly. The radioactive particle detection method of this application detects the fluorescence yield of different types and activities of radioactive source 1 in different types of gaseous media at different detection distances using detector 2. This establishes a mathematical relationship between the characteristic fluorescence yield and the activity of radioactive source 1. Furthermore, detector 2 detects the intensity of the characteristic fluorescence generated by the interaction of radioactive particles with the gaseous medium to detect the activity of radioactive source 1. By utilizing the generally long range of characteristic fluorescence, the detection distance for the activity of radioactive source 1 is improved.

[0150] In the description of this application, the references to terms such as "in one embodiment," "in some embodiments," "in other embodiments," "in yet another embodiment," or "exemplary," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine the different embodiments or examples described in this application, as well as the features of the different embodiments or examples.

[0151] The various embodiments / implementations provided in this application can be combined with each other without creating contradictions.

[0152] The above are merely preferred embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A device for detecting a characteristic fluorescence, characterized in that include: A housing having a sealed chamber capable of containing a gaseous medium; A radioactive source placed in the sealed chamber, the radioactive source being used to emit radioactive particles, the radioactive particles generating characteristic fluorescence after interacting with the gaseous medium; A detector, positioned downstream of the radioactive source along the direction of radioactive particle transmission, is used to receive the characteristic fluorescence; the detector includes a condenser lens group having at least one condenser lens, positioned upstream of the detector along the direction of radioactive particle transmission, for focusing the divergent characteristic fluorescence; at least one condenser lens has an anti-reflection coating on its surface, the anti-reflection coating being used to reduce reflected light and increase light transmittance. A mounting frame movably disposed in the sealed chamber, wherein the radiation source is placed on the mounting frame; A guide rail extends along the length of the detection device, and the mounting bracket is disposed on the guide rail and is movable along the extension direction of the guide rail; The detector is disposed at one end of the housing along its length and is located on the outside or inside of the sealed chamber; The housing has an air inlet and an air outlet communicating with the sealed chamber. The detection device is connected to a gas cylinder through the air inlet and a vacuum pump through the air outlet. The gas medium is then introduced into the sealed chamber through the air inlet and the sealed chamber is evacuated through the air outlet, thereby realizing the function of replacing the gas medium. The housing has a sample exchange port communicating with the sealed chamber. The detection device includes a sealing cover, which is located at the sample exchange port. The radioactive source is placed or removed through the sample exchange port to replace radioactive sources of different types and activities.

2. The probe device of claim 1, wherein, The detection device includes a filter array positioned between the radiation source and the detector along the transmission direction of the radioactive particles, for filtering non-characteristic fluorescence.

3. The probe device of claim 1, wherein, The shell is made of stainless steel or aluminum alloy.

4. A method for feature fluorescence detection, applied to the detection device of any one of claims 1-3, characterized in that, The detection method includes: The radioactive source was placed in a sealed chamber; The detector is positioned downstream of the radioactive source, along the direction of transmission of the radioactive particles emitted by the radioactive source. The sealed chamber is evacuated, and a gaseous medium is introduced into the sealed chamber. The detector measures the yield of characteristic fluorescence produced by the interaction of radioactive particles with the gaseous medium.

5. The method of claim 4, wherein, The detection method also includes: The distance between the detector and the radiation source is adjusted to detect the yield of the characteristic fluorescence.

6. The method of claim 4, wherein, The detection method also includes: Replace the radiation source and detect the yield of the characteristic fluorescence.

7. The method of claim 4, wherein, The detection method also includes: The gas medium was changed, and the yield of the characteristic fluorescence was detected.

8. The method of claim 4, wherein, After the step of detecting the yield of characteristic fluorescence produced by the interaction of radioactive particles with the gaseous medium using a detector, the method includes: The characteristic fluorescence is filtered by a filter array.

9. The method of claim 8, wherein, Before the step of filtering the characteristic fluorescence through a filter array, the following steps are included: The characteristic fluorescence is focused by a condenser lens group having at least one condenser lens.

10. The method of claim 9, wherein, The mathematical relationship between the yield of the characteristic fluorescence and the activity of the radioactive source is as follows: In the formula: a count of characteristic fluorescence detected by the probe; quantum efficiency of the detector; A is the receiving area of the characteristic fluorescence; For the source to condenser spherical distance; characteristic fluorescence transmission for the condenser lens group; characteristic fluorescence transmission of the filter set; emission rate for radioactive particles; characteristic fluorescent photon energy; for radioactive particle energy; Conversion efficiency was characterized by fluorescence.

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