CN220381300U - Radiation-resistant sodium iodide measurement detector - Google Patents
Radiation-resistant sodium iodide measurement detector Download PDFInfo
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- CN220381300U CN220381300U CN202322262736.3U CN202322262736U CN220381300U CN 220381300 U CN220381300 U CN 220381300U CN 202322262736 U CN202322262736 U CN 202322262736U CN 220381300 U CN220381300 U CN 220381300U
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- light guide
- sodium iodide
- photomultiplier
- radiation
- analysis system
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- FVAUCKIRQBBSSJ-UHFFFAOYSA-M sodium iodide Chemical compound [Na+].[I-] FVAUCKIRQBBSSJ-UHFFFAOYSA-M 0.000 title claims abstract description 233
- 235000009518 sodium iodide Nutrition 0.000 title claims abstract description 77
- 238000005259 measurement Methods 0.000 title claims abstract description 33
- 230000005855 radiation Effects 0.000 title claims abstract description 28
- 239000013078 crystal Substances 0.000 claims abstract description 50
- 230000003287 optical effect Effects 0.000 claims abstract description 18
- 239000013307 optical fiber Substances 0.000 claims description 16
- 239000000523 sample Substances 0.000 claims description 15
- 230000002285 radioactive effect Effects 0.000 claims description 12
- 239000010453 quartz Substances 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 230000001678 irradiating effect Effects 0.000 claims 1
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 230000000149 penetrating effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- WJWSFWHDKPKKES-UHFFFAOYSA-N plutonium uranium Chemical compound [U].[Pu] WJWSFWHDKPKKES-UHFFFAOYSA-N 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005202 decontamination Methods 0.000 description 1
- 230000003588 decontaminative effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005251 gamma ray Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003758 nuclear fuel Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Landscapes
- Measurement Of Radiation (AREA)
Abstract
The utility model discloses an irradiation-resistant sodium iodide measurement detector which comprises a sodium iodide crystal, a bent light guide, a photomultiplier tube, an electronic device and an analysis system, wherein the sodium iodide crystal is opposite to a measuring pool and is used for generating fluorescence according to rays to be measured so as to emit optical signals, the photomultiplier tube is used for amplifying the optical signals, the electronic device and the analysis system are electrically connected with the photomultiplier tube and are used for analyzing the amplified optical signals, the bent light guide is arranged between the sodium iodide crystal and the photomultiplier tube, the first end of the bent light guide is connected with the sodium iodide crystal, the second end of the bent light guide is connected with the photomultiplier tube and is used for collecting and transmitting the optical signals, and the end face of the first end of the bent light guide and the end face of the second end of the bent light guide are at a first angle so as to prevent the photomultiplier tube, the electronic device and the analysis system from being directly irradiated by environmental high-radioactivity background. The radiation-resistant sodium iodide measurement detector is suitable for working under high-radioactivity background and can prevent components such as a photomultiplier and electronics from being damaged by radiation.
Description
Technical Field
The utility model belongs to the technical field of nuclear industry, and particularly relates to a radiation-resistant sodium iodide measurement detector.
Background
The post-treatment sample analysis is an important component part of a nuclear fuel post-treatment plant, can timely and accurately monitor the content of each component in the process feed liquid and the change condition of each process stage, and provides necessary control parameters for process flow control. The total gamma radioactivity of the feed liquid can directly reflect the decontamination and purification effects of the process of the post-treatment plant and is a key analysis parameter in the analysis of the post-treatment plant; in addition, the uranium plutonium content measured by gamma absorption is also a key analysis parameter for control in the post-treatment plant process.
The most commonly used gamma ray detector is a sodium iodide detector, which has the outstanding characteristics of high efficiency and high sensitivity, and is used for measuring the uranium plutonium concentration by a gamma absorption method or measuring the total gamma radioactivity.
The sodium iodide detector in the prior art consists of a sodium iodide crystal, a photomultiplier, an electronic processing circuit and an analysis system, wherein the photomultiplier and part of electronic devices are positioned at the rear end of the sodium iodide crystal and are in linear layout. In post-treatment sample analysis, the substances with strong radioactive background exist or have strong radioactive background in the working environment, and the strong radioactive diameter penetrates through the crystal, so that the photomultiplier and the electronics at the rear end of the probe of the detector are obviously affected, and the problems of large fluctuation of measurement results, reduced accuracy, damage of the electronics and the like are caused.
Disclosure of Invention
The utility model aims to solve the technical problems in the prior art and provides the radiation-resistant sodium iodide measuring detector which can be suitable for working under high-radioactivity background and can prevent components such as a photomultiplier, electronics and the like from being damaged by irradiation.
In order to solve the problems, the utility model adopts the following technical scheme:
the utility model provides a radiation-resistant sodium iodide measurement detector, includes sodium iodide crystal, curved light guide, photomultiplier and electron device and analytic system, sodium iodide crystal just is to the measuring cell for produce fluorescence according to the ray of awaiting measuring, in order to send the light signal, the photomultiplier is used for amplifying the light signal, electron device and analytic system are connected with photomultiplier electricity for carry out the analysis to the light signal after amplifying, curved light guide locates between sodium iodide crystal and the photomultiplier, and its first end is connected with sodium iodide crystal, and the second end is connected with the photomultiplier for collect and transmit the light signal, and the terminal surface of the first end of curved light guide and the terminal surface of second end are first angle, in order to avoid environment high radioactivity background direct irradiation photomultiplier and electron device and analytic system.
Preferably, the detector is in a highly radioactive environment, the detector further comprising a shielded enclosure, the photomultiplier tube and the electronics and analysis system being disposed within the shielded enclosure.
Preferably, the shielding shell is made of stainless steel.
Preferably, the curved light guide is in the shape of an arc-shaped bent pipe, and the first angle ranges from 90 degrees to 135 degrees.
Preferably, the end face of the first end of the bent light guide is a vertical face, and the end face of the second end is a horizontal face.
Preferably, the curved light guide adopts split type structure, and it includes first toper light guide, second toper light guide, optic fibre, the one end of first toper light guide with photomultiplier is connected, and the other end passes through optic fibre with the second toper light guide is connected, the other end of second toper light guide is installed on the sodium iodide crystal face.
Preferably, said sodium iodide crystal and said second tapered light guide are disposed in a highly radioactive environment facing the measurement cell, and said photomultiplier and said electronics and analysis system are disposed in a low-radioactivity/non-radioactive environment remote from the measurement cell.
Preferably, the conical bottom of the first conical light guide is connected with the photomultiplier, the conical top is connected with one end of the optical fiber, the conical bottom of the second conical light guide is connected with the sodium iodide crystal, and the conical top is connected with the other end of the optical fiber.
Preferably, the optical fiber comprises two sections connected with each other, namely a horizontal section and a vertical section.
Preferably, the curved light guide is made of quartz.
The radiation-resistant sodium iodide measurement detector provided by the utility model has the advantages that the light guide connected with the sodium iodide crystal and the photomultiplier is arranged in a bent shape, so that the high-radioactivity background can be effectively prevented from directly entering the photomultiplier, the electronic device and the analysis system through the sodium iodide crystal, and the radiation damage of the high-radioactivity background is prevented, and the radiation-resistant sodium iodide measurement detector is suitable for measurement in a high-radioactivity environment. And the structure is simple, and the installation and maintenance are convenient and quick.
Drawings
FIG. 1 is a schematic diagram of one embodiment of a radiation-resistant sodium iodide measurement probe of the present utility model;
fig. 2 is a schematic structural diagram of another embodiment of the radiation-resistant sodium iodide measurement probe of the present utility model.
In the figure: 1-measuring cell, 2-sodium iodide crystal, 3-bent light guide, 31-second taper light guide, 32-first taper light guide, 4-optical fiber, 6-photomultiplier, 7-electronics and analysis system, 8-shielding shell.
Detailed Description
The following description of the embodiments of the present utility model will be made more apparent, and the embodiments described in detail, but not necessarily all, in connection with the accompanying drawings. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.
In the description of the present utility model, it should be noted that, the terms "upper" and the like indicate an orientation or a positional relationship based on the orientation or the positional relationship shown in the drawings, and are merely for convenience and simplicity of description, and do not indicate or imply that the apparatus or element in question must be provided with a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, the terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "configured," "mounted," "secured," and the like are to be construed broadly and may be either fixedly connected or detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art according to the specific circumstances.
The utility model provides an irradiation-resistant sodium iodide measurement detector which comprises a sodium iodide crystal, a bent light guide, a photomultiplier tube, an electronic device and an analysis system, wherein the sodium iodide crystal is opposite to a measuring pool and is used for generating fluorescence according to rays to be measured so as to emit optical signals, the photomultiplier tube is used for amplifying the optical signals, the electronic device and the analysis system are electrically connected with the photomultiplier tube and are used for analyzing the amplified optical signals, the bent light guide is arranged between the sodium iodide crystal and the photomultiplier tube, the first end of the bent light guide is connected with the sodium iodide crystal, the second end of the bent light guide is connected with the photomultiplier tube and is used for collecting and transmitting the optical signals, and the end face of the first end and the end face of the second end of the bent light guide are in a first angle so as to prevent the photomultiplier tube, the electronic device and the analysis system from being directly irradiated by environmental high-radioactivity background.
Example 1
As shown in fig. 1, the embodiment discloses a radiation-resistant sodium iodide measurement detector, which comprises a sodium iodide crystal 2, a bent light guide 3, a photomultiplier 6 and an electronic device and analysis system 7, wherein the sodium iodide crystal 2 is opposite to a measuring cell 1, receives gamma rays penetrating out of the measuring cell 1 and generates fluorescence so as to emit optical signals, the photomultiplier 6 is used for amplifying the optical signals, the electronic device and analysis system 7 is electrically connected with the photomultiplier 6 and is used for analyzing the amplified optical signals, the bent light guide 3 is arranged between the sodium iodide crystal 2 and the photomultiplier 6, a first end of the bent light guide 3 is connected with the sodium iodide crystal 2, a second end of the bent light guide 3 is connected with the photomultiplier 6 and is used for collecting and transmitting the optical signals, and an end face of the first end and an end face of the second end of the bent light guide 3 are at a certain inclination angle, namely the first angle, so that the photomultiplier 6 and the electronic device and the analysis system 7 are prevented from being directly irradiated by environmental high-radioactivity background.
In this embodiment, the whole detector is in the high radioactivity environment, the detector still includes shielding shell 8, shielding shell is cavity structure, its one end is equipped with the opening, photomultiplier 6 and electronics and analytic system 7 all set up in shielding shell 8, and photomultiplier 6 sets up the open end at shielding shell 8, electronics and analytic system 7 set up the inboard at shielding shell 8, in order to guarantee that shielding shell 8 has good shielding effect, shielding shell 8 adopts the stainless steel to make.
As shown in fig. 1, the curved light guide 3 is an arc-shaped bent pipe, the range of the first angle is 90-135 degrees, and the irradiation resistance requirement is met while the processing difficulty is reduced. In this embodiment the first angle is 90 deg. and the end face of the first end of the bent light guide 3 is a vertical face and the end face of the second end is a horizontal face to prevent the high radioactive background in the environment from penetrating the sodium iodide crystal 2 into the photomultiplier tube 6 and the electronics and analysis system 7, causing damage thereto.
Preferably, a plurality of bent light guides 3 (generally 3-6) can be arranged between the sodium iodide crystal 2 and the photomultiplier tube 6, and the plurality of bent light guides 3 are connected end to end, so that the dosage of high-radioactivity background entering the photomultiplier tube 6 and the electronic devices and the analysis system 7 can be further reduced.
In this embodiment, the radiation-resistant sodium iodide measurement detector is used for measuring the ray to be measured in the measurement cell 1, the high-radioactivity background in the environment and the ray to be measured are simultaneously incident into the sodium iodide crystal 2, the ray to be measured is deposited in the crystal, the sodium iodide crystal 2 is caused to emit fluorescence, the fluorescence is reflected for multiple times by the bent light guide 3, finally enters the photomultiplier 6 at a certain angle with the sodium iodide crystal 2, the photomultiplier 6 amplifies the incident optical signal, and then transmits the amplified optical signal to the electronic device and the analysis system 7, and the electronic device and the analysis system 7 analyze the amplified optical signal.
The high-radioactivity background enters the sodium iodide crystal 2, and is basically not deposited due to high energy and small absorption cross section, and directly penetrates the sodium iodide crystal 2, and the arc-shaped bent light guide 3 can prevent the high-radioactivity background from entering the photomultiplier 6 and the electronic device and the analysis system 7 at the rear end, so that the irradiation influence of the high-radioactivity background on the photomultiplier 6 and the electronic device and the analysis system 7 is avoided.
In this embodiment, the curved light guide 3 is made of quartz.
The radiation-resistant sodium iodide measurement detector in the embodiment is characterized in that the light guide is arranged in the shape of an arc-shaped bent pipe, so that the high-radioactivity background in the environment can be effectively prevented from penetrating through the sodium iodide crystal 2 and entering the photomultiplier 6, the electronics and the analysis system 7, and the photomultiplier 6, the electronics and the analysis system 7 are arranged in the shielding shell 8, so that the radiation-resistant sodium iodide measurement detector is further protected from the high-radioactivity background in the environment, and the device can work normally under the high-radioactivity background.
Example 2
The embodiment discloses another irradiation-resistant sodium iodide measurement detector.
As shown in fig. 2, the curved light guide 3 adopts a split structure, which comprises a first conical light guide 32, a second conical light guide 31 and an optical fiber 4, wherein one end of the first conical light guide 32 is connected with the photomultiplier 6, the other end of the first conical light guide is connected with the second conical light guide 31 through the optical fiber 4, and the other end of the second conical light guide 31 is arranged on the sodium iodide crystal 2.
In this embodiment, the sodium iodide crystal 2 and the second tapered light guide 31 are disposed in a highly radioactive environment facing the measuring cell 1, and the photomultiplier tube 6 and the electronics and analysis system 7 are disposed in a low-radioactivity/non-radioactive environment remote from the measuring cell 1.
Specifically, the conical bottom of the first conical light guide 32 is connected with the photomultiplier 6, the conical top is connected with one end of the optical fiber 4, the conical bottom of the second conical light guide 31 is connected with the sodium iodide crystal 2, and the conical top is connected with the other end of the optical fiber 4. The optical fiber 4 comprises two sections which are connected with each other, namely a horizontal section and a vertical section, and an optical signal generated by the incident of the ray to be detected on the sodium iodide crystal 2 is transmitted to the photomultiplier 6 through the optical fiber 4. And the tapered bottom surfaces of the first tapered light guide 32 and the second tapered light guide 31 are perpendicular to each other, specifically, the tapered bottom surfaces of the first tapered light guide 32 are horizontally disposed and the tapered bottom surfaces of the second tapered light guide 31 are vertically disposed.
In this embodiment, the curved light guide 3 is made of quartz.
In this embodiment, the high-radioactivity background and the ray to be measured are simultaneously incident into the sodium iodide crystal 2, the ray to be measured is deposited in the sodium iodide crystal 2, so that the sodium iodide crystal 2 emits fluorescence, the fluorescence enters the optical fiber 4 through the second taper light guide 31 for transmission, and enters the photomultiplier 6 through the first taper light guide 32 at the far end for analysis treatment, and the high-radioactivity background enters the sodium iodide crystal 2, and is directly penetrated through the sodium iodide crystal 2 due to high energy and small absorption section, so that the radiation influence of the high-radioactivity background on the photomultiplier 6, the electronics and the analysis system 7 is avoided.
The light guide of the radiation-resistant sodium iodide measurement detector in the embodiment adopts split type arrangement, and the photomultiplier tube 6 and the electronic device and the analysis system 7 are arranged in a low-radioactivity/non-radioactivity environment far away from the measuring cell 1, so that the irradiation influence of high-radioactivity background on the photomultiplier tube 6 and the electronic device and the analysis system 7 is thoroughly solved. Ensuring that the device can work normally under high radioactive background.
It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present utility model, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the utility model, and are also considered to be within the scope of the utility model.
Claims (10)
1. A radiation-resistant sodium iodide measurement detector is characterized by comprising a sodium iodide crystal (2), a bent light guide (3), a photomultiplier (6) and an electronic device and analysis system (7),
the sodium iodide crystal (2) is opposite to the measuring cell (1) and is used for generating fluorescence according to rays to be measured so as to emit light signals,
the photomultiplier (6) is used for amplifying the optical signal,
the electronic device and the analysis system (7) are electrically connected with the photomultiplier (6) and are used for analyzing the amplified optical signals,
the bent light guide (3) is arranged between the sodium iodide crystal (2) and the photomultiplier (6), the first end of the bent light guide is connected with the sodium iodide crystal (2), the second end of the bent light guide is connected with the photomultiplier (6) and is used for collecting and transmitting light signals, and the end face of the first end of the bent light guide (3) and the end face of the second end are at a first angle so as to avoid the environment high-radioactivity background from directly irradiating the photomultiplier (6) and the electronic device and analysis system (7).
2. The radiation resistant sodium iodide measurement probe of claim 1 wherein the probe is in a highly radioactive environment,
the detector further comprises a shielding housing (8),
the photomultiplier (6) and the electronics and analysis system (7) are both arranged in a shielding housing (8).
3. Radiation-resistant sodium iodide measurement probe according to claim 2, characterized in that the shielding housing (8) is made of stainless steel.
4. The radiation-resistant sodium iodide measurement probe according to claim 2, wherein the curved light guide (3) is in the shape of an arc-shaped bend, and the first angle is in the range of 90 ° to 135 °.
5. The radiation-resistant sodium iodide measurement probe according to claim 4, wherein the end face of the first end of the bent light guide (3) is a vertical face and the end face of the second end is a horizontal face.
6. The radiation-resistant sodium iodide measurement probe according to claim 1, wherein the bent light guide (3) is of a split structure comprising a first tapered light guide (32), a second tapered light guide (31), an optical fiber (4),
one end of the first conical light guide (32) is connected with the photomultiplier (6), the other end of the first conical light guide is connected with the second conical light guide (31) through an optical fiber (4), and the other end of the second conical light guide (31) is arranged on the surface of the sodium iodide crystal (2).
7. The radiation-resistant sodium iodide measurement probe according to claim 6, wherein the sodium iodide crystal (2) and the second tapered light guide (31) are disposed in a highly radioactive environment facing the measurement cell (1),
the photomultiplier (6) and the electronics and analysis system (7) are arranged in a low-radioactivity/non-radioactivity environment remote from the measuring cell (1).
8. The radiation-resistant sodium iodide measurement probe according to claim 7, wherein the conical bottom of the first conical light guide (32) is connected to the photomultiplier (6), the conical tip is connected to one end of the optical fiber (4),
the cone bottom of the second cone-shaped light guide (31) is connected with the sodium iodide crystal (2), and the cone top is connected with the other end of the optical fiber (4).
9. The radiation-resistant sodium iodide measurement probe according to claim 7, wherein the optical fiber (4) comprises two sections connected to each other, a horizontal section and a vertical section.
10. Radiation-resistant sodium iodide measurement probe according to any one of claims 1 to 9, characterized in that the curved light guide (3) is made of quartz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322262736.3U CN220381300U (en) | 2023-08-22 | 2023-08-22 | Radiation-resistant sodium iodide measurement detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322262736.3U CN220381300U (en) | 2023-08-22 | 2023-08-22 | Radiation-resistant sodium iodide measurement detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220381300U true CN220381300U (en) | 2024-01-23 |
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ID=89568233
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322262736.3U Active CN220381300U (en) | 2023-08-22 | 2023-08-22 | Radiation-resistant sodium iodide measurement detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220381300U (en) |
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2023
- 2023-08-22 CN CN202322262736.3U patent/CN220381300U/en active Active
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