CN118033719A - Recoil proton telescope - Google Patents
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- CN118033719A CN118033719A CN202410007662.5A CN202410007662A CN118033719A CN 118033719 A CN118033719 A CN 118033719A CN 202410007662 A CN202410007662 A CN 202410007662A CN 118033719 A CN118033719 A CN 118033719A
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 108
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 108
- 239000010703 silicon Substances 0.000 claims abstract description 108
- 239000004698 Polyethylene Substances 0.000 claims abstract description 78
- -1 polyethylene Polymers 0.000 claims abstract description 78
- 229920000573 polyethylene Polymers 0.000 claims abstract description 78
- 238000006243 chemical reaction Methods 0.000 claims abstract description 22
- 238000005259 measurement Methods 0.000 claims description 38
- 239000011449 brick Substances 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 18
- 230000002093 peripheral effect Effects 0.000 claims description 16
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 9
- 229910052796 boron Inorganic materials 0.000 claims description 9
- 229910010293 ceramic material Inorganic materials 0.000 claims description 4
- 230000005855 radiation Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004980 dosimetry Methods 0.000 description 2
- 230000004992 fission Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000005865 ionizing radiation Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T3/00—Measuring neutron radiation
- G01T3/06—Measuring neutron radiation with scintillation detectors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T3/00—Measuring neutron radiation
- G01T3/02—Measuring neutron radiation by shielding other radiation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T3/00—Measuring neutron radiation
- G01T3/08—Measuring neutron radiation with semiconductor detectors
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- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- High Energy & Nuclear Physics (AREA)
- Molecular Biology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Measurement Of Radiation (AREA)
Abstract
The embodiment of the application provides a recoil proton telescope which is used for receiving neutron beam, and comprises a polyethylene converter, a silicon detector and a scintillator detector, wherein the polyethylene converter is perpendicular to the incidence direction of the neutron beam, and is provided with incidence surfaces and deviating surfaces which are positioned at two opposite sides, and the incidence surfaces face the incidence direction of the neutron beam; the silicon detector is positioned on one side of the polyethylene conversion body, which is provided with the deviating surface, and an included angle between the silicon detector and the polyethylene conversion body is larger than 0 degrees and smaller than 90 degrees; the scintillator detector is positioned on one side of the silicon detector, which is away from the polyethylene converter, and an included angle between the scintillator detector and the silicon detector is 0 degrees. The recoil proton telescope provided by the embodiment of the application can reduce the influence of high-energy neutrons on the beam.
Description
Technical Field
The application relates to the technical field of neutron measurement devices, in particular to a recoil proton telescope.
Background
The neutron reference radiation field is the basis of the performance detection, response calibration and other works of the neutron measurement device, and is also an indispensable technical platform for carrying out the researches of neutron dosimetry, micro-dosimetry, nuclear data measurement and the like. In recent years, the technical institutions for measuring and calibrating neutron research in developed countries, such as Germany PTB, british NPL, japanese AIST, JAEA and the like, do not need to input a large amount of manpower and material resources to research neutron reference radiation fields. The current national defense science and technology industry ionizing radiation primary metering station establishes a 144 keV-15 MeV single-energy neutron reference radiation field based on a serial accelerator, and solves the magnitude tracing of parameters such as the neutron detector fluence, the dose and the like in an energy region below 20 MeV. But currently, no quasi-single-energy neutron reference radiation field with the energy region of more than 20MeV is established in China. With the requirements of space neutron detection tasks and the development of ground high-energy proton accelerators, the requirements of energy regions above 20MeV on single-energy neutron reference radiation fields are more and more prominent.
Neutron fluence rate is one of the most important parameters of neutron reference radiation, and only a reference radiation field whose neutron fluence rate is accurately known can be used for detector calibration or performance testing. In the related art, the absolute measurement of the neutron fluence rate can be carried out through a recoil proton telescope, and the recoil proton telescope mainly adopts 1 H (n, p) elastic scattering reaction, so that the reaction channel of H in the energy range below 200MeV is simpler, only one reaction is elastically scattered, the elastic scattering surface can be used for replacing the full section in the energy range below 200MeV, and the full section measurement method of H is simpler.
However, the recoil proton telescope in the related art is applicable only to the energy region below 20 MeV. In the energy range of 20 MeV-200 MeV, along with the improvement of neutron energy, the reaction channels between high-energy neutrons and materials with different structures are increased sharply, so that the influence of the high-energy neutrons on the beam on the measurement structure is increased, the occasional coincidence background is increased, the uncertainty of measurement is increased, and the recoil proton telescope in the related technology is not suitable for neutron fluence rate measurement in the energy region above 20 MeV.
Disclosure of Invention
Accordingly, it is a primary object of embodiments of the present application to provide a recoil proton telescope capable of reducing the effect of high energy neutrons on a beam.
In order to achieve the above object, the technical solution of the embodiment of the present application is as follows:
The embodiment of the application provides a recoil proton telescope for receiving neutron beam flow, which comprises:
The polyethylene conversion body is perpendicular to the incidence direction of the neutron beam, and is provided with incidence surfaces and deviating surfaces which are positioned on two opposite sides, and the incidence surfaces face the incidence direction of the neutron beam;
The silicon detector is positioned on one side of the polyethylene conversion body, which is provided with the deviating surface, and an included angle between the silicon detector and the polyethylene conversion body is larger than 0 degrees and smaller than 90 degrees;
The scintillator detector is positioned on one side, away from the polyethylene converter, of the silicon detector, and an included angle between the scintillator detector and the silicon detector is 0 degrees.
In one embodiment, the recoil proton telescope is used for neutron fluence rate measurement in the energy area above 20MeV, and the silicon detector and the scintillator detector are located outside the neutron beam.
In one embodiment, the angle between the silicon detector and the polyethylene converter is 45 degrees; and/or the number of the groups of groups,
The center of the scintillator detector is positioned on an extension line of a connecting line of the center of the polyethylene converter and the center of the silicon detector; and/or the number of the groups of groups,
The center of the polyethylene converter coincides with the center of the neutron beam.
In one embodiment, the recoil proton telescope further includes a beam limiting diaphragm disposed between the silicon detector and the scintillator detector.
In one embodiment, the diameter of the polyethylene converter is smaller than the diameter of the neutron beam.
In one embodiment, the silicon detector comprises a fixing piece and a silicon wafer, wherein the fixing piece is wound on the periphery of the silicon wafer so as to avoid recoil protons generated by the polyethylene converter.
In one embodiment, the fixing member is a ceramic material.
In one embodiment, the recoil proton telescope further comprises a shielding assembly sleeved on the outer peripheral sides of the silicon detector and the scintillator detector.
In one embodiment, the shielding component comprises an aluminum material layer, and the aluminum material layer is sleeved on the outer peripheral sides of the silicon detector and the scintillator detector; and/or the number of the groups of groups,
The shielding component comprises a lead brick layer, and the lead brick layer is sleeved on the outer peripheral sides of the silicon detector and the scintillator detector; and/or the number of the groups of groups,
The shielding component comprises a boron-containing polyethylene brick layer, and the boron-containing polyethylene brick layer is sleeved on the outer peripheral sides of the silicon detector and the scintillator detector.
In one embodiment, the recoil proton telescope comprises a multi-channel analyzer and an upper computer, wherein the multi-channel analyzer is respectively in signal connection with the silicon detector, the scintillator detector and the upper computer.
The embodiment of the application provides a recoil proton telescope which is used for receiving neutron beam current and comprises a polyethylene converter, a silicon detector and a scintillator detector. The silicon detector is located on one side of the polyethylene conversion body, which is provided with a deviating surface, and an included angle between the silicon detector and the polyethylene conversion body is larger than 0 degrees and smaller than 90 degrees, the scintillator detector is located on one side of the silicon detector, which is away from the polyethylene conversion body, and the included angle between the scintillator detector and the silicon detector is 0 degrees. Therefore, the energy of recoil protons received by the silicon detector can be reduced, so that the volume of the scintillator is reduced, and the accidental coincidence background is reduced. Meanwhile, when the recoil proton telescope is used for neutron fluence rate measurement in an energy region above 20MeV, as the silicon detector deflects a certain angle relative to the polyethylene converter and is not arranged in parallel, the silicon detector and the scintillator detector can be arranged outside a neutron beam, so that the influence of high-energy neutrons on the neutron beam on the silicon detector and the scintillator detector can be reduced, the problem that the silicon detector is excessively damaged by irradiation on a beam and the scintillator detector is excessively high in counting rate on the beam to generate signal saturation is prevented, and the problem that the background is accidentally met can be further reduced, so that the recoil proton telescope can be used for neutron fluence rate measurement in the energy region above 20MeV and the uncertainty of measurement is low.
Drawings
FIG. 1 is a schematic diagram of a recoil proton telescope for neutron fluence rate measurement according to an embodiment of the present application, showing the direction of motion of neutron beam and recoil protons (straight solid arrows) and showing the data connection relationship between a multi-channel analyzer and an upper computer (dashed arrows);
FIG. 2 is a schematic illustration of a portion of the structure of the recoil proton telescope of FIG. 1;
fig. 3 is a schematic diagram of the structure of the silicon detector in fig. 2.
Description of the reference numerals
10. A polyethylene converter; 10a, incidence plane; 10b, a facing away surface; 20. a silicon detector; 21. a fixing member; 22. a silicon wafer; 30. a scintillator detector; 40. a multi-channel analyzer; 50. an upper computer; 60. a fission ionization chamber; 70. a plastic scintillator.
Detailed Description
An embodiment of the present application provides a recoil proton telescope for receiving neutron beam, referring to fig. 1 and 2, the recoil proton telescope includes a polyethylene converter 10, a silicon detector 20 and a scintillator detector 30.
The polyethylene converter 10 is perpendicular to the incidence direction of the neutron beam, and the polyethylene converter 10 has an incidence surface 10a and a departure surface 10b on opposite sides, the incidence surface 10a being oriented to the incidence direction of the neutron beam.
Specifically, the polyethylene converter 10 is a high-density polyethylene structure, which is disposed on a neutron beam, and can form recoil protons after the neutron beam is irradiated onto the polyethylene converter 10.
The polyethylene converter 10 is perpendicular to the incidence direction of the neutron beam, so that the position of the measurement fluence can be determined easily.
Further, the installation position of the polyethylene converter 10 is according to the actual situation. For example, the center of the polyethylene converter 10 coincides with the center of the neutron beam. This is because the center position of the neutron beam is generally a position where the uniformity of the neutron beam is good, and the measurement uncertainty can be reduced by disposing the polyethylene converter 10 at the center position of the neutron beam.
The silicon detector 20 is located on the side of the polyethylene conversion body 10 having the facing away from the face 10b, and the angle between the silicon detector 20 and the polyethylene conversion body 10 (the same angle as the angle α in fig. 1) is greater than 0 ° and less than 90 °.
Specifically, the silicon detector 20 may be passed by recoil protons from the polyethylene converter 10 and kept at a high energy to move toward the scintillator detector 30.
It will be appreciated that by forming an angle between the silicon detector 20 and the polyethylene converter 10, the energy of the recoil protons passing through the silicon detector 20 can be reduced, and thus the volume of the scintillator detector 30 used to deposit the energy of the recoil protons can be reduced, and thus the occasional coincidence background can be reduced.
In addition, it can be understood that when the device is used for measuring the neutron fluence rate in the energy region above 20MeV, the silicon detector 20 and the scintillator detector 30 can be located outside the neutron beam just because a certain included angle is formed between the silicon detector 20 and the polyethylene converter 10, so that the situation that the neutron beam greatly affects the silicon detector 20 and the scintillator detector 30 and increases accidentally to meet the background can be avoided.
It should be noted that the angle between the silicon detector 20 and the polyethylene converter 10 may be determined according to practical situations.
Illustratively, the angle between the silicon detector 20 and the polyethylene converter 10 is 45 °. With an angle of 45 deg., it is possible to facilitate arranging the silicon detector 20 and the scintillator detector 30 outside the neutron beam on the one hand, and to further reduce the energy of recoil protons passing through the silicon detector 20 on the other hand, to reduce the volume of the scintillator, thereby further reducing the occasional background.
The scintillator detector 30 is located on the side of the silicon detector 20 facing away from the polyethylene converter 10, and the angle between the scintillator detector 30 and the silicon detector 20 is 0 °.
Specifically, the scintillator detector 30 is disposed in parallel with the silicon detector 20, and on the one hand, when the scintillator detector 30 is used for neutron fluence rate measurement in an energy region of 20MeV or more, the scintillator detector 30 can be positioned outside the neutron beam. On the other hand, the energy of the recoil protons from the silicon detector 20 can be made to be deposited in the scintillator detector 30 as much as possible to reduce the measurement uncertainty.
According to the actual situation, the center of the scintillator detector 30 may be located on an extension line of the line connecting the center of the polyethylene converter 10 and the center of the silicon detector 20. Thereby, the scintillator detector 30 can be enabled to deposit as much energy as possible from the recoil protons of the silicon detector 20.
In addition, the specific model and size of the scintillator detector 30 are not limited, and for example, the scintillator detector 30 may be of the BC501A type, and the size thereof is 2 inches.
Obviously, the recoil proton telescope can be suitable for neutron fluence rate measurement of different energy areas, can be used for neutron fluence rate measurement of energy areas below 20MeV, and can also be used for neutron fluence rate measurement of energy areas above 20 MeV.
Illustratively, referring to FIG. 1, a recoil proton telescope is used for neutron fluence rate measurement in the energy region above 20MeV, with the silicon detector 20 and scintillator detector 30 located outside the neutron beam.
In the related art, in the neutron fluence rate measurement process of the energy region below 20MeV, the neutron flow can move along all directions, so that the influence of the neutron flow on the detector is small, the detector and the polyethylene conversion body 10 can be arranged in parallel, namely, the included angle is 0 °, the detector can be arranged on the neutron flow, the occasional coincidence background generated by the detector is small, and the measurement uncertainty is low. However, in the neutron fluence rate measurement process in the energy region above 20MeV, the neutron beam mainly moves along the same direction (for example, the shape of the neutron beam is similar to a cylinder), so that the influence of the neutron beam on the detector is greatly increased, along with the improvement of neutron energy, the reaction channels between high-energy neutrons and different structural materials are greatly increased, if the detector is still arranged on the neutron beam, the accidental coincidence background generated by the neutron beam is greatly increased, and the measurement uncertainty is also increased. For example, the recommended standard cross section for International atomic energy organization (IAEA) at energy regions below 20MeV is shown in Table 1. As can be seen from Table 1, the uncertainty of the H-shaped elastic scattering cross section of 20MeV or less was 0.83% at a maximum of 1 keV. In the energy range of 20MeV to 200MeV, the database only gives the evaluation section data, and does not give the uncertainty of the section. And when the uncertainty of the injection quantity is evaluated by each laboratory internationally, the uncertainty of the section of the high-energy neutrons is about 5%.
Table 1IAEA recommended H (n, n) reaction section and uncertainty
While the recoil proton telescope of the present application includes a polyethylene converter 10, a silicon detector 20, and a scintillator detector 30. The silicon detector 20 is located on the side of the polyethylene converter 10 having the facing away from the face 10b, and the angle between the silicon detector 20 and the polyethylene converter 10 is greater than 0 ° and less than 90 °, the scintillator detector 30 is located on the side of the silicon detector 20 facing away from the polyethylene converter 10, and the angle between the scintillator detector 30 and the silicon detector 20 is 0 °. Thus, the energy of the recoil protons received by the silicon detector 20 can be reduced, thereby reducing the volume of the scintillator and thus reducing accidental compliance with the background. Meanwhile, when the recoil proton telescope is used for neutron fluence measurement in an energy region above 20MeV, because the silicon detector 20 deflects a certain angle relative to the polyethylene converter 10 instead of being arranged in parallel, the silicon detector 20 and the scintillator detector 30 can be arranged outside a neutron beam, thereby reducing the influence of high-energy neutrons on the neutron beam on the silicon detector 20 and the scintillator detector 30, preventing the silicon detector 20 from being excessively damaged by irradiation on the beam and preventing the scintillator detector 30 from generating a signal saturation problem due to excessively high counting rate on the beam, further reducing accidental coincidence background, so that the recoil proton telescope can be used for neutron fluence measurement in the energy region above 20MeV and has low uncertainty of measurement.
In one embodiment, the recoil proton telescope further includes a beam limiting diaphragm disposed between the silicon detector 20 and the scintillator detector 30.
Specifically, by providing a beam limiting diaphragm between the silicon detector 20 and the scintillator detector 30, the solid angle of the recoil protons can be accurately controlled.
In one embodiment, the diameter of the polyethylene converter 10 is smaller than the diameter of the neutron beam.
Specifically, the size and thickness of the polyethylene converter 10 determine the number of recoil protons, which in turn determines the detection efficiency of the recoil proton telescope. The larger and thicker the polyethylene converter 10, the higher the efficiency of the detector. However, when the diameter of the converter is increased, the area of the covered neutron beam is increased, and the measurement uncertainty is increased due to beam non-uniformity and non-uniformity of the polyethylene itself. Thus, by making the diameter of the polyethylene converter 10 smaller than the diameter of the neutron beam, uniformity of the neutron beam moving to the polyethylene converter 10 is ensured, thereby reducing measurement uncertainty.
Illustratively, the neutron beam has a diameter of 40mm and the polyethylene converter 10 has a diameter of 15mm.
In addition, the thicker the polyethylene converter 10, the more dispersed the energy of the recoil protons, which is detrimental to subsequent measurements by the silicon detector 20 and the scintillator detector 30. Therefore, the polyethylene converter 10 is not preferably excessively thick, for example, the polyethylene converter 10 has a thickness of 2mm.
In one embodiment, referring to fig. 3, the silicon detector 20 includes a fixing member 21 and a silicon wafer 22, wherein the fixing member 21 is wound around the periphery of the silicon wafer 22 to avoid recoil protons generated by the polyethylene converter 10.
Specifically, the fixing member 21 can be used to fix and strengthen the silicon wafer 22, which is wound around the peripheral side of the silicon wafer 22 instead of being disposed on both sides of the end face of the silicon wafer 22, so that the loss of energy of the recoil protons due to the reaction with the fixing member 21 can be reduced as much as possible during the process of passing the recoil protons through the silicon wafer 22. Thus, measurement uncertainty can be reduced.
The dimensions of the silicon detector 20 may be set according to practical situations, for example, the diameter of the effective area of the silicon detector 20 is 40mm, and the thickness 1503 μm.
In addition, the application is not limited to the specific model of the silicon detector 20, for example, the silicon detector 20 is a MICRON MSD040 model.
The specific material and shape of the fixing member 21 are not limited.
For example, the fixing member 21 is a ceramic material. Because the main component of the ceramic material is Al 2O3, the reaction cross section of the material on neutrons is relatively small, so that the influence on the fluence rate measurement is small.
For another example, the fixing member 21 is an annular frame having a cavity, and the silicon wafer 22 is disposed in the cavity. Therefore, the influence of other structural substances on the movement path of the recoil protons on the energy and movement direction of the recoil protons can be reduced.
In one embodiment, the recoil proton telescope further includes a shielding assembly that is sleeved on the outer peripheral sides of the silicon detector 20 and the scintillator detector 30.
In particular, the shielding assembly can act as a shield, reducing accidental compliance with background, and reducing measurement uncertainty.
The shielding assembly can be of different structures according to practical situations.
For example, the shielding assembly includes an aluminum material layer that is sleeved on the outer peripheral sides of the silicon detector 20 and the scintillator detector 30, so that the silicon detector 20 and the scintillator detector 30 can be enclosed in the aluminum material layer.
The aluminum material layer may be an aluminum alloy material or a pure aluminum member.
As another example, the shielding assembly includes a layer of lead bricks that is sleeved on the outer peripheral sides of the silicon detector 20 and the scintillator detector 30. The lead brick layer is made of lead brick material, and can shield background photon signals of a radiation field so as to avoid accidental coincidence with the excessively high background.
For another example, the shielding assembly includes a layer of boron-containing polyethylene bricks that is sleeved around the outer peripheral sides of the silicon detector 20 and the scintillator detector 30. The boron-containing polyethylene brick layer is made of boron-containing polyethylene brick material, and can shield background neutrons of a radiation field so as to avoid accidental coincidence with the background being too high caused by scattered neutrons.
It will be appreciated that the shielding assembly may include only one of the aluminum material layer, the lead brick layer, and the boron-containing polyethylene brick layer, or a combination of the foregoing.
Illustratively, the shielding assembly includes a layer of lead bricks disposed on the outer peripheral sides of the silicon detector 20 and the scintillator detector 30, and a layer of boron-containing polyethylene bricks disposed on the outer peripheral sides of the lead bricks. And both the silicon detector 20 and the scintillator detector 30 are disposed in the aluminum material layer. Thus, the shielding assembly can shield the silicon detector 20 from visible light and electromagnetic signals on the one hand, and can shield the scintillator detector 30 from background neutrons and photon signals of the radiation field on the other hand, so that accidental excessive coincidence caused by scattered neutrons can be avoided.
In one embodiment, referring to fig. 1, the recoil proton telescope includes a multi-channel analyzer 40 and a host computer 50, wherein the multi-channel analyzer 40 is respectively in signal connection with the silicon detector 20, the scintillator detector 30 and the host computer 50. The multi-channel analyzer 40 may receive signals from the silicon detector 20 and the scintillator detector 30, and after processing, may be capable of transmitting signals to the host computer 50.
In one embodiment, the method for absolute measurement of neutron fluence rate by recoil proton telescope is as follows. In the measurement process, the length of the long and short integration windows is first determined, the scintillator detector 30 is subjected to signal discrimination by the long and short integration windows method, and the photon signals are subtracted, so that accidental coincidence with the background can be reduced. The second step uses protons to scale the energy of the scintillator detector 30, converting the abscissa of the scintillator pulse amplitude spectrum from the address to proton energy. In a third step, the polyethylene converter 10, the silicon detector 20 and the scintillator detector 30 and the shielding assembly (i.e. the recoil proton telescope whole) are placed at the respective measuring positions. Fourth, energy selection is carried out on recoil protons in the pulse amplitude spectrum of the scintillator detector 30, so that the proton energy range is limited, and accidental coincidence background generated by the recoil proton telescope structural material is reduced. Fifth, the digitizer is used to make coincidence measurements of the silicon detector 20 and the scintillator detector 30, with the scintillator detector 30 being a door-open detector, further reducing the occasional coincidence background. In the sixth step, the measurement result is processed by the multi-channel analyzer 40 and the host computer 50.
In one embodiment, the polyethylene converter 10 is spaced 1m from the collimator exit, the energy of the neutron beam is 100MeV, and after reacting with the polyethylene converter 10, the polyethylene converter 10 generates 50MeV recoil protons, and the separation between the silicon detector 20 and the scintillator detector 30 is 3cm.
In one embodiment, referring to fig. 1, a fission ionization chamber 60 and a first neutron monitor are further disposed at the front end of the polyethylene converter 10, and a plastic scintillator 70 and a second neutron monitor are disposed at the rear end of the recoil proton telescope.
In the description of the present application, reference to the term "one embodiment," "in some embodiments," "in a particular embodiment," or "exemplary" etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In the present application, the schematic representations of the above terms are not necessarily for the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the various embodiments or examples described in the present application and the features of the various embodiments or examples may be combined by those skilled in the art without contradiction.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.
Claims (10)
1. A recoil proton telescope for receiving a neutron beam, the recoil proton telescope comprising:
The polyethylene conversion body is perpendicular to the incidence direction of the neutron beam, and is provided with incidence surfaces and deviating surfaces which are positioned on two opposite sides, and the incidence surfaces face the incidence direction of the neutron beam;
The silicon detector is positioned on one side of the polyethylene conversion body, which is provided with the deviating surface, and an included angle between the silicon detector and the polyethylene conversion body is larger than 0 degrees and smaller than 90 degrees;
The scintillator detector is positioned on one side, away from the polyethylene converter, of the silicon detector, and an included angle between the scintillator detector and the silicon detector is 0 degrees.
2. The recoil proton telescope according to claim 1, being used for neutron fluence rate measurement in energy areas above 20MeV, and the silicon detector and the scintillator detector being located outside the neutron beam.
3. The recoil proton telescope according to claim 1, characterized in that the angle between the silicon detector and the polyethylene converter is 45 °; and/or the number of the groups of groups,
The center of the scintillator detector is positioned on an extension line of a connecting line of the center of the polyethylene converter and the center of the silicon detector; and/or the number of the groups of groups,
The center of the polyethylene converter coincides with the center of the neutron beam.
4. The recoil proton telescope according to claim 1, further comprising a beam limiting diaphragm disposed between the silicon detector and the scintillator detector.
5. The recoil proton telescope according to claim 1, wherein the diameter of the polyethylene converter is smaller than the diameter of the neutron beam.
6. The recoil proton telescope according to any one of claims 1 to 5, wherein the silicon detector comprises a fixing member and a silicon wafer, the fixing member being wound around a peripheral side of the silicon wafer to avoid recoil protons generated by the polyethylene converter.
7. The recoil proton telescope according to claim 6, wherein said fixing member is a ceramic material.
8. The recoil proton telescope according to any of claims 1 to 5, further comprising a shielding member which is fitted around the outer peripheral sides of the silicon detector and the scintillator detector.
9. The recoil proton telescope according to claim 8, wherein said shielding member comprises an aluminum material layer which is sleeved on the outer peripheral sides of said silicon detector and said scintillator detector; and/or the number of the groups of groups,
The shielding component comprises a lead brick layer, and the lead brick layer is sleeved on the outer peripheral sides of the silicon detector and the scintillator detector; and/or the number of the groups of groups,
The shielding component comprises a boron-containing polyethylene brick layer, and the boron-containing polyethylene brick layer is sleeved on the outer peripheral sides of the silicon detector and the scintillator detector.
10. The recoil proton telescope according to any of claims 1-5, comprising a multichannel analyzer and a host computer, said multichannel analyzer being in signal connection with said silicon detector, said scintillator detector and said host computer, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202410007662.5A CN118033719A (en) | 2024-01-02 | 2024-01-02 | Recoil proton telescope |
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| CN202410007662.5A CN118033719A (en) | 2024-01-02 | 2024-01-02 | Recoil proton telescope |
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