CN220855203U - Dose calibration system of neutron radiation detector with wide energy spectrum - Google Patents
Dose calibration system of neutron radiation detector with wide energy spectrum Download PDFInfo
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- CN220855203U CN220855203U CN202322460699.7U CN202322460699U CN220855203U CN 220855203 U CN220855203 U CN 220855203U CN 202322460699 U CN202322460699 U CN 202322460699U CN 220855203 U CN220855203 U CN 220855203U
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- 230000005855 radiation Effects 0.000 title claims abstract description 57
- 238000001228 spectrum Methods 0.000 title claims abstract description 25
- 238000012360 testing method Methods 0.000 claims abstract description 12
- 239000002699 waste material Substances 0.000 claims abstract description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 18
- 229910052744 lithium Inorganic materials 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 15
- 238000010586 diagram Methods 0.000 description 6
- 230000004044 response Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 231100000673 dose–response relationship Toxicity 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001225 therapeutic effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000011287 therapeutic dose Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Measurement Of Radiation (AREA)
Abstract
The utility model discloses a dose calibration system of a wide-energy-spectrum neutron radiation detector, which comprises a neutron target device, a deflection system, a beam garbage can, a neutron collimator and a test bench which are sequentially arranged, wherein the neutron target device is used for generating neutrons with high yield; the deflection system is used for deflecting the waste proton beam after passing through the neutron target device; the beam garbage can is used for collecting and shielding deflected proton beams and radiation fields; the neutron collimator is used for shielding a background neutron radiation field to be eliminated; the test bench is used for calibrating the high-energy narrow-spectrum neutron dose after the background neutron radiation field is eliminated. The method can improve the accuracy of the wide-energy-spectrum neutron radiation detector for calibrating the high-energy neutron dose.
Description
Technical Field
The utility model relates to the technical field of radiation monitoring, in particular to a dosage calibration system of a neutron radiation detector with a wide energy spectrum.
Background
A neutron radiation monitor is an instrument for measuring neutron radiation that is capable of detecting neutrons in different energy ranges, which may accompany the neutron radiation in the surrounding environment in nuclear plant construction, operation and neutron-related applications. Neutron radiation dose equivalent monitoring is essential during application.
When the conventional neutron radiation detector performs neutron fluence rate measurement, the fluence energy response is poor, so that the reliability of neutron detection efficiency in a wider energy range cannot be satisfied. In addition, the existing equipment has the problem of inaccurate response and dose calibration, so that misjudgment of neutron radiation is caused, and the problem that people cannot timely take proper protective measures when receiving radiation is caused, so that potential risks of neutron radiation to personnel and the environment are increased. In the application scenario of the proton therapeutic apparatus, if the neutron radiation dose cannot be accurately measured and monitored, it may not be ensured that the patient receives the predetermined therapeutic dose, and the therapeutic effect and safety are affected.
Disclosure of utility model
In order to improve the accuracy of energy and dose response calibration of a neutron radiation detector, the scheme provides a dose calibration system of a wide-energy-spectrum neutron radiation detector, neutrons with high yield are generated through a high-purity lithium target, large-angle deflection of proton beam current is realized in a small space range by adopting an annular halbach permanent magnet array, minimization of background neutrons is realized by adopting a beam current garbage can and a collimator designed by an optimization algorithm, and the accuracy of single-energy neutron dose calibration can be improved.
The utility model provides a dosage calibration system of a neutron radiation detector with a wide energy spectrum, which comprises the following components: neutron target device, deflection system, beam garbage can, neutron collimator and test bench,
Wherein the neutron target device is used for generating neutrons with high yield; the deflection system is used for deflecting the waste proton beam after passing through the neutron target device; the beam garbage can is used for collecting and shielding deflected proton beams and radiation fields; the neutron collimator is used for shielding a background neutron radiation field to be eliminated; the test bench is used for calibrating the high-energy narrow-spectrum neutron dose after the background neutron radiation field is eliminated.
The system can perform real-time calibration test and response performance test on the dose response of the neutron radiation detector with wide energy response, eliminates the radiation field of background neutrons to the maximum extent, and improves the accuracy of single-energy narrow-spectrum neutron dose calibration.
Optionally, in the dose calibration system, the neutron target device adopts a lithium target, the lithium target adopts a lithium target film of 2-167mg/cm < 2 >, and the thickness of the lithium target film is in direct proportion to the yield of the monoenergetic neutrons.
Alternatively, in the dose calibration system, the deflection system uses halbach array permanent magnets to deflect protons Shu Liuchan remaining after passing through the neutron target device, and the magnetic field strength of the array permanent magnets is 1.5T.
Alternatively, in the above dose calibration system, the good field area of the deflection system is 20mm, and the deflection angle for the proton beam having an energy of 70MeV-235MeV is in the range of 10 ° to 5 °.
Optionally, in the dose calibration system, the neutron collimator is configured to eliminate background neutrons having a radiation intensity less than a preset intensity value, and to shield a radiation field of the reflected neutrons.
Optionally, in the dose calibration system, the material, the size and the shielding thickness of the beam garbage can and the material, the size and the thickness of the neutron collimator are obtained through Monte Carlo software simulation radiation field optimization.
Optionally, in the dose calibration system, the test bench is further used for measuring the fluence and dose equivalent of the pulsed neutron radiation field in real time.
According to the dose calibration system provided by the utility model, the high-purity lithium target is adopted to enable the proton beam to generate neutrons with high yield, the halbach array permanent magnet is adopted to realize large-angle deflection of the proton beam in a wide energy spectrum range in a small range, and the optimized and adjusted beam garbage can and the collimator are adopted to shield unnecessary particles and radiation fields, so that the minimization of background neutrons can be realized, and the accuracy of high-energy narrow-spectrum neutron dose calibration is improved.
The foregoing description is only an overview of the present utility model, and is intended to be implemented in accordance with the teachings of the present utility model in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present utility model more readily apparent.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 shows a schematic diagram of a dose calibration system of a broad spectrum neutron radiation detector according to one embodiment of the utility model;
FIG. 2 shows neutron yield versus target film thickness for different energies, according to one embodiment of the utility model;
FIG. 3 shows a schematic diagram of a magnetic field distribution curve of an annular halbach array of permanent magnets according to one embodiment of the utility model;
FIG. 4 illustrates a proton beam deflection schematic according to one embodiment of the present utility model;
FIG. 5 shows a neutron radiation energy spectrum diagram according to an embodiment of the utility model.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The utility model provides a dose calibration system of a wide-spectrum neutron radiation detector, which comprises a neutron target device, a deflection system, a beam garbage can, a neutron collimator and a test bench.
FIG. 1 shows a schematic diagram of a dose calibration system of a broad spectrum neutron radiation detector according to one embodiment of the utility model. As shown in fig. 1, the proton beam bombards the lithium target to generate neutrons with different wide energy spectrums, the remaining proton beam is collected and shielded by a beam garbage can after being deflected by a deflection magnet, background neutrons in the neutrons with wide energy spectrums are eliminated by a neutron collimator, and finally, the high-energy narrow-spectrum neutron dose is calibrated on a test bench in real time.
Wherein the neutron target device is used for generating neutrons with high yield. The proton beam after being accelerated by the accelerator bombards the lithium target to generate neutrons with different energies. In order to generate neutrons with high yield, the scheme adopts a high-purity lithium target, and prepares a lithium target film with the concentration of 2-167mg/cm 2 by a rolling method.
By studying the relationship between the target film thickness and the unienergy neutron yield, it is known that the thickness of the lithium target film is proportional to the unienergy neutron yield. FIG. 2 shows neutron yield versus Li target film thickness for different energies, according to one embodiment of the utility model. As shown in fig. 2, the relationship between the neutron yield and the lithium target film thickness of 70MeV, 150MeV, and 235MeV energy was studied, which showed that the greater the target film thickness, the greater the neutron yield. The thickness of the lithium target film can be properly increased to obtain neutrons with high yield.
The deflection system is used for deflecting the proton beam current remained after passing through the neutron target device. The deflection system deflects protons Shu Liuchan remaining after passing through the neutron target device using halbach array permanent magnets with a field strength of 1.5T, which can produce the strongest magnetic field with the least amount of magnets.
FIG. 3 shows a schematic diagram of the magnetic field distribution curve of an annular halbach array of permanent magnets according to one embodiment of the utility model. As shown in fig. 3, by arranging magnets of different magnetization directions in order, the magnetic field intensity of one side of the halbach permanent magnet array is increased, and the magnetic field intensity of the other side is decreased.
In one embodiment of the utility model, the good field area of the annular halbach permanent magnet array is 20mm, and the deflection angle for proton beam current with energy of 70MeV-235MeV is in the range of 10 DEG to 5 deg.
Fig. 4 shows a proton beam deflection schematic according to one embodiment of the utility model. As shown in fig. 4, the proton beam deflection angle of 235MeV was 5 °, the proton beam deflection angle of 70MeV was 10 °, and the proton beam deflection angles of the remaining energies were between 10 ° and 5 °. And the greater the energy, the smaller the deflection angle.
The beam garbage can is used for collecting and shielding the deflected proton beam and the radiation field, is placed in the deflection angle range of the deflection system to the proton beam, and is filled with water. The neutron collimator is used for shielding background neutrons which need to be eliminated and reflecting the radiation field of the neutrons.
The radiation shielding can be systematically analyzed, and the materials, the sizes and the shielding thicknesses of the beam garbage can and the materials, the sizes and the thicknesses of the neutron collimator can be obtained by optimizing the simulation radiation field of Monte Carlo software.
The method is characterized in that the Monte Carlo software is adopted to calculate, the attenuation effect of each reaction section and the shielding body can be comprehensively considered, the shielding design is optimized, the optimal shielding material and the corresponding thickness are obtained, and background neutrons are minimized.
FIG. 5 shows a neutron radiation energy spectrum diagram according to an embodiment of the utility model. As shown in fig. 5, the neutron energy spectrum curves with energies of 70MeV, 100MeV, 125MeV, 150MeV, 175MeV, 200MeV, and 235MeV respectively contain a large amount of background neutrons with low radiation intensity to be eliminated. The test bench is used for calibrating the high-energy narrow-spectrum neutron dose after background neutrons are eliminated.
According to the dose calibration system provided by the utility model, the high-purity lithium target is adopted to enable the proton beam to generate neutrons with high yield, the annular halbach permanent magnet array is adopted to realize large-angle deflection of the proton beam in a wide energy spectrum range in a small range, and the beam garbage bin and the collimator which are optimally designed are adopted to shield unnecessary particles and radiation fields, so that minimization of background neutrons can be realized, and accuracy of high-energy narrow-spectrum neutron dose calibration in wide-energy-spectrum energy response is improved.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the utility model may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the utility model, various features of the utility model are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be construed as reflecting the intention that: i.e., the claimed utility model requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this utility model.
Those skilled in the art will appreciate that the modules or units or components of the devices in the examples disclosed herein may be arranged in a device as described in this embodiment, or alternatively may be located in one or more devices different from the devices in this example. The modules in the foregoing examples may be combined into one module or may be further divided into a plurality of sub-modules.
Those skilled in the art will appreciate that the modules in the apparatus of the embodiments may be adaptively changed and disposed in one or more apparatuses different from the embodiments. The modules or units or components of the embodiments may be combined into one module or unit or component and, furthermore, they may be divided into a plurality of sub-modules or sub-units or sub-components. Any combination of all features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or units of any method or apparatus so disclosed, may be used in combination, except insofar as at least some of such features and/or processes or units are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the utility model and form different embodiments. For example, in the following claims, any of the claimed embodiments can be used in any combination.
Furthermore, some of the embodiments are described herein as methods or combinations of method elements that may be implemented by a processor of a computer system or by other means for performing the functions. Thus, a processor with the necessary instructions for implementing a method or a method element forms a means for implementing the method or the method element. Furthermore, the elements of the apparatus embodiments described herein are examples of the following apparatus: the apparatus is for carrying out the functions performed by the elements for carrying out the objects of the utility model.
As used herein, unless otherwise specified the use of the ordinal terms "first," "second," "third," etc., to describe a general object merely denote different instances of like objects, and are not intended to imply that the objects so described must have a given order, either temporally, spatially, in ranking, or in any other manner.
While the utility model has been described with respect to a limited number of embodiments, those skilled in the art, having benefit of the above description, will appreciate that other embodiments are contemplated within the scope of the utility model as described herein. Furthermore, it should be noted that the language used in the specification has been principally selected for readability and instructional purposes, and may not have been selected to delineate or circumscribe the inventive subject matter. Accordingly, many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the appended claims. The disclosure of the present utility model is intended to be illustrative, but not limiting, of the scope of the utility model, which is defined by the appended claims.
Claims (8)
1. A dose calibration system of a wide-spectrum neutron radiation detector is characterized by comprising a neutron target device, a deflection system, a beam garbage can, a neutron collimator and a test bench which are sequentially arranged,
The neutron target device is used for enabling the proton beam to generate neutrons with high yield; the deflection system is used for deflecting the waste proton beam after passing through the neutron target device; the beam garbage can is used for collecting and shielding deflected proton beams and radiation fields; the neutron collimator is used for shielding a background neutron radiation field to be eliminated; the test bench is used for calibrating the high-energy narrow-spectrum neutron dose after the background neutron radiation field is eliminated.
2. The broad spectrum neutron radiation detector dosage calibration system of claim 1, wherein the neutron target device employs a lithium target, the lithium target employs a lithium target film of 2-167mg/cm 2, and the thickness of the lithium target film is proportional to the yield of monoenergetic neutrons.
3. The broad spectrum neutron radiation detector dosage calibration system of claim 1, wherein the deflection system deflects protons Shu Liuchan remaining after passing through the neutron target device using an annular halbach array of permanent magnets having a magnetic field strength of 1.5T.
4. A dose calibration system for a broad spectrum neutron radiation detector according to claim 3, wherein the good field area of the annular halbach array is 20mm for a deflection angle of a proton beam having an energy of 70MeV-235MeV in the range of 10 ° to 5 °.
5. The broad spectrum neutron radiation detector dosage calibration system of claim 1, wherein the beam garbage can is positioned within a deflection angle range of the deflection system to the proton beam, and wherein the beam garbage can is filled with water.
6. The broad spectrum neutron radiation detector of claim 1, wherein the neutron collimator is adapted to eliminate background neutrons having a radiation intensity less than a predetermined intensity value and to shield the radiation field of reflected neutrons.
7. The broad spectrum neutron radiation detector dosage calibration system of claim 1, wherein the beam garbage can materials, dimensions and shielding thicknesses and the neutron collimator materials, dimensions and thicknesses are optimized by monte carlo software simulated radiation fields.
8. The broad spectrum neutron radiation detector of claim 1, wherein the test stand is further adapted to measure the fluence and dose equivalent of the pulsed neutron radiation field in real time.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322460699.7U CN220855203U (en) | 2023-09-11 | 2023-09-11 | Dose calibration system of neutron radiation detector with wide energy spectrum |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202322460699.7U CN220855203U (en) | 2023-09-11 | 2023-09-11 | Dose calibration system of neutron radiation detector with wide energy spectrum |
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| CN220855203U true CN220855203U (en) | 2024-04-26 |
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