CN219676304U - PIPS anti-coincidence structure - Google Patents
PIPS anti-coincidence structure Download PDFInfo
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- CN219676304U CN219676304U CN202320155938.5U CN202320155938U CN219676304U CN 219676304 U CN219676304 U CN 219676304U CN 202320155938 U CN202320155938 U CN 202320155938U CN 219676304 U CN219676304 U CN 219676304U
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- photomultiplier
- coincidence
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- 239000002245 particle Substances 0.000 claims abstract description 62
- 238000005259 measurement Methods 0.000 claims abstract description 20
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 24
- 239000010949 copper Substances 0.000 claims description 24
- 229910052802 copper Inorganic materials 0.000 claims description 24
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 16
- 239000011248 coating agent Substances 0.000 claims description 16
- 238000000576 coating method Methods 0.000 claims description 16
- 239000004408 titanium dioxide Substances 0.000 claims description 8
- 239000003973 paint Substances 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 230000002391 anti-complement effect Effects 0.000 claims 4
- 108010008730 anticomplement Proteins 0.000 claims 4
- 230000000694 effects Effects 0.000 abstract description 16
- 239000000523 sample Substances 0.000 description 48
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 230000003321 amplification Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000005468 ion implantation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000004347 surface barrier Methods 0.000 description 2
- 238000002315 alpha-particle spectrum Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
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- Measurement Of Radiation (AREA)
Abstract
The utility model relates to a PIPS anti-coincidence structure, which adopts a PIPS detector arranged on a detector bracket; the PIPS detector is arranged in the shielding device, and the anti-coincidence detector is fully distributed in the shielding device; arranging a sample device below the PIPS detector; when the PIPS detector detects a sample placed on the sample device, the PIPS detector only responds to gamma rays when responding to alpha particles, beta particles and gamma particles, and the PIPS detector is in anti-coincidence with the influence of the gamma particles in the environment on the measurement results of the alpha particles and the beta particles; the PIPS anti-coincidence effect of the product in the prior art is poor, the background count is high, the measurement accuracy is low, and the problems of high local count rate, inaccurate measurement and the like are solved.
Description
Technical Field
The embodiment of the utility model relates to a detection structure for detecting alpha, beta and gamma rays, in particular to a PIPS anti-coincidence structure.
Background
PIPS is an abbreviation for Passive Implanted Planar Silicon Detector (passive implanted planar silicon detector), which is a new process product for semiconductor passivation ion implantation. It can replace silicon surface barrier detectors and diffusion junction detectors in most applications today. The contact surface is formed by ion implantation, so that an accurate, thin and abrupt junction can be obtained, the alpha particle resolution performance is good, and the leakage current is only 1/10-1/100 of that of the surface barrier type. In addition, the incident window is very thin, and peak broadening can be reduced for low-level alpha particle spectrum measurement. Because the measured alpha particles and beta particles have low radioactivity level and are easily influenced by surrounding environment radiation, the measuring environment has high requirements on low background, a combined probe of a plastic scintillator and PIPS is needed, and the sample preparation can be concentrated by adopting two measures of air filtration and liquid evaporation. At present, the PIPS product in the prior art has poor anti-coincidence effect, high background count, low measurement precision and the like, and needs to solve the problems of high background count rate, inaccurate measurement and the like.
Disclosure of Invention
The PIPS anti-coincidence structure is used for anti-coincidence of influence of gamma particles on alpha particle and beta particle measurement results in an environment when alpha particles, beta particles and gamma particles are responded.
In order to achieve the above object, an embodiment of the present utility model provides a PIPS anti-coincidence structure, including:
a detector bracket;
the PIPS detector is arranged on the detector bracket;
a shielding device, the PIPS detector is arranged in the shielding device,
an anti-coincidence detector, which is arranged in the shielding device;
the sample device is arranged below the PIPS detector;
when the PIPS detector detects a sample placed on the sample device, the PIPS detector only responds to gamma rays when responding to alpha particles, beta particles and gamma particles, and the anti-coincidence detector only responds to gamma rays, so that the influence of gamma particles in the environment on the measurement results of the alpha particles and the beta particles is anti-coincidence.
Further, in the PIPS anti-coincidence structure, a front-end amplifying device is arranged at one side of the shielding device, and the PIPS detector is electrically connected with the front-end amplifying device.
Further, in the PIPS anti-coincidence structure, the sample is directly opposite to the lower part of the PIPS detector; the sample moves left and right along with the sample device, and the sample device sends the sample to the position right below the PIPS detector.
Further, in the PIPS anti-coincidence structure, the shielding device further includes:
a shielding copper housing, which is arranged around the PIPS detector;
a shield copper cover, which is fixed above the shield copper cover; the shielding copper housing and the shielding copper cover form a closed frame;
the plastic scintillators are fixed in the closed frame and are distributed on the inner side of the closed frame in an inverted concave mode;
a titanium dioxide coating, which is coated on the plastic scintillator;
and (3) a black paint coating, wherein the black paint coating is coated on the titanium dioxide coating.
Further, in the PIPS anti-coincidence structure, the anti-coincidence detector further includes:
the photomultiplier is arranged on one side of the shielding copper housing of the shielding device; the photomultiplier tube reflects gamma rays to the plastic scintillator, performs photoelectric conversion and performs multiplication;
a photomultiplier fixing sleeve fixed on the outer side of the shielding copper housing; inserting the photomultiplier tube into the photomultiplier tube fixing sleeve;
the photomultiplier tube clamping sleeve is fixedly connected with the photomultiplier tube fixing sleeve through threads;
a photomultiplier tail plug is arranged in the photomultiplier card sleeve; a compression spring is arranged in the photomultiplier tail insert to compress the photomultiplier and the plastic scintillator; one end of the tail plug of the photomultiplier is connected with the photomultiplier through an insert; the photomultiplier tail plug is connected to the control system.
Further, in the PIPS anti-coincidence structure, the sample device further comprises:
a sample tray, which is arranged below the sample; fixing a detector bracket above the sample tray;
and fixing the sample pushing frame below the sample tray.
Further, in the PIPS anti-coincidence structure, the front end amplifying device is a signal amplifier of the PIPS detector, the front end amplifying device is electrically connected with a control system of the PIPS anti-coincidence structure, and the front end amplifying device is fixed above the detector bracket.
Further, in the PIPS anti-conforming structure, a lead chamber is arranged at the outer side of the PIPS anti-conforming structure.
Compared with the prior art, the PIPS detector is arranged on the detector bracket; the PIPS detector is arranged in the shielding device, and the anti-coincidence detector is fully distributed in the shielding device; arranging a sample device below the PIPS detector; when the PIPS detector detects a sample placed on the sample device, the PIPS detector only responds to gamma rays when responding to alpha particles, beta particles and gamma particles, and the PIPS detector is in anti-coincidence with the influence of the gamma particles in the environment on the measurement results of the alpha particles and the beta particles; the problems of poor PIPS anti-coincidence effect, high background count, low measurement accuracy, inaccurate measurement and the like of the product in the prior art are solved.
Drawings
FIG. 1 is a schematic perspective view of the present utility model;
FIG. 2 is a schematic view of the front view of FIG. 1;
FIG. 3 is a schematic top view of FIG. 1;
fig. 4 is a schematic view in full section of fig. 1.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. However, those of ordinary skill in the art will understand that in various embodiments of the present utility model, numerous technical details have been set forth in order to provide a better understanding of the present utility model. However, the technical solutions claimed in the claims of the present utility model can be realized without these technical details and various changes and modifications based on the following embodiments.
A first embodiment of the present utility model relates to a PIPS anti-coincidence structure, as shown in fig. 1, 2, 3, and 4, including:
the probe bracket 1 arranged in the PIPS anti-coincidence structure in the embodiment is mainly used for installing the PIPS probe 2; the PIPS detector 2 in the present embodiment is mainly used for responding to α particles, β particles, and γ particles, and the PIPS detector 2 is disposed on the detector bracket 1;
the PIPS detector 2 is arranged in a shielding device 20, and the shielding device 20 mainly isolates the detected sample from the outside.
An anti-coincidence detector 30 is provided inside the shielding device 20; the anti-coincidence detector 30 is mainly responsive to gamma rays only, and thus can be anti-coincident with the effect of ambient gamma on alpha, beta measurements. In order to further reduce the background, the accuracy of measuring the alpha particles and the beta particles of the sample is improved.
A sample device 40 is arranged below the PIPS detector 2; the sample device 40 is mainly used for placing and conveying the sample 3
When the PIPS detector 2 detects the sample 3 placed on the sample device, the anti-coincidence detector 30 only responds to the gamma rays when the PIPS detector 2 responds to the alpha particles, the beta particles and the gamma particles, and the influence of the gamma particles in the environment on the measurement results of the alpha particles and the beta particles is anti-coincidence. In order to further reduce the background and thus improve the accuracy of measuring the alpha particles and the beta particles of the sample, the PIPS anti-coincidence structure in the embodiment is used for anti-coincidence of the PIPS anti-coincidence structure of the influence of the gamma particles on the measurement results of the alpha particles and the beta particles in the environment when responding to the alpha particles, the beta particles and the gamma particles; the problems of poor PIPS anti-coincidence effect, high background count, low measurement accuracy, inaccurate measurement and the like of the product in the prior art are solved.
In order to achieve the above technical effects, in the present embodiment, as shown in fig. 1, 2, 3, and 4, a front-end amplifier 4 is disposed on one side of the shielding device 20, and the PIPS detector 2 is electrically connected to the front-end amplifier 4. The front-end amplifying device 4 is used for amplifying signals of the PIPS detector 2 when measuring alpha particles and beta particles through the design of an amplifying circuit, so that the signals are converted into electric signals by the PIPS detector when measuring the alpha particles and the beta particles, and therefore the quantification and the reading of the alpha particles and the beta particles by a control system of a PIPS anti-coincidence structure are met.
In order to achieve the above technical effects, in this embodiment, the PIPS inverse structure is shown in fig. 1, 2, 3, and 4, and is a sample 5 facing the lower side of the PIPS detector 2; the sample 5 moves left and right with the sample device 40, and the sample device 40 sends the sample 5 directly under the PIPS detector 2. The sample device 40 conveys the sample 5 by moving left and right.
In order to achieve the above technical effects, the PIPS in the present embodiment has a reverse fitting structure, as shown in fig. 1, 2, 3, and 4, and the shielding device 20 further includes:
a shielding copper housing 6 is arranged around the PIPS detector 2; the shielding copper housing 6 surrounds the PIPS detector 2;
a shield copper cover 7 is fixed above the shield copper cover 6; the shielding copper housing 6 and the shielding copper cover 7 form a closed frame; the shield copper cover 7 is secured over the shield copper housing 6 to form a closed frame enclosing the PIPS detector 2.
A plurality of plastic scintillators 10 are fixed in the closed frame, and the plastic scintillators 10 are distributed on the inner side of the closed frame in an inverted concave mode; the plastic scintillator 10 is only responsive to gamma rays and thus can be anti-fit to the effects of ambient gamma on alpha, beta measurements.
Coating a titanium dioxide coating 9 on a plastic scintillator 10; the titanium dioxide coating 9 mainly increases the light reflection effect.
A black paint coating 8 is applied over the titanium dioxide coating 9. The black paint coating 8 mainly plays a role in light shielding.
In order to achieve the above technical effects, in this embodiment, the PIPS anti-coincidence structure, as shown in fig. 1, 2, 3, and 4, includes:
a photomultiplier 12, wherein the photomultiplier 12 is arranged on one side of the shielding copper housing 6 of the shielding device 20; the photomultiplier 12 performs photoelectric conversion and multiplication on the gamma rays reflected by the plastic scintillator 10;
a photomultiplier fixing sleeve 11 is fixed on the outer side of the shielding copper housing 6; inserting a photomultiplier 12 into the photomultiplier fixing sleeve 11;
the photomultiplier tube clamping sleeve 13 is fixedly connected with the photomultiplier tube fixing sleeve 11 through threads; the photomultiplier tube clamping sleeve 13 and the photomultiplier tube fixing sleeve 11 mainly serve to fix the photomultiplier tube 12.
A photomultiplier tail insert 14 is arranged in the photomultiplier card sleeve 11; one end of the photomultiplier tail insert 14 is connected with the photomultiplier 12 through an insert; a compression spring is arranged in the photomultiplier tail insert 14 to compress the photomultiplier 12 and the plastic scintillator 10; the photomultiplier tube tail insert 14 is connected to a control system. The photomultiplier tube tail insert 14 is primarily intended for connection to a control system, enabling data amplified by the photomultiplier tube 12 to be conducted into the control system. Enabling the control system to identify the data conducted by the photomultiplier tube 12.
In order to achieve the above technical effects, the PIPS anti-coincidence structure in this embodiment, as shown in fig. 1, 2, 3, and 4, the sample device 40 further includes:
a sample tray 15 is arranged below the sample 5; a detector bracket 1 is fixed above the sample tray 15; the sample tray 15 is mainly used for placing the samples 5.
A sample pushing frame 16 is fixed below the sample tray 15. The sample pushing frame 16 transports the sample 5 mainly by moving back and forth.
In order to achieve the above technical effects, in the embodiment, as shown in fig. 1, 2, 3 and 4, the front-end amplifying device 4 is a signal amplifier of a PIPS detector, the front-end amplifying device 4 is electrically connected with a control system of the PIPS anti-coincidence structure, and the front-end amplifying device 4 is fixed above the detector bracket 1. The main function of the front-end amplification device 4 is to amplify the signal detected by the PIPS detector 2 by an amplification circuit inside the front-end amplification device 4.
In order to achieve the above technical effects, the PIPS anti-conforming structure in this embodiment is provided with a lead chamber 17 on the outer side of the PIPS anti-conforming structure as shown in fig. 1, 2, 3 and 4. The lead chamber 17 is mainly used for physically shielding environmental radiation and reducing environmental background.
In the PIPS anti-coincidence structure in the present embodiment, the PIPS detector 2 is used as a main detector, and can respond to α, β, γ simultaneously; the plastic scintillator 10 is used as an anti-coincidence detector, and can only respond to gamma rays in structural design, so that the influence of environmental gamma particles on alpha particle and beta particle measurement results can be anti-coincidence. In order to further reduce the background, the plastic scintillator 10 is firstly coated with the titanium dioxide coating 9 to increase the light reflection effect, then coated with the black paint coating 8 to play a role of avoiding light, a through window is reserved at the joint of the plastic scintillator 10 and the photomultiplier 12, the PIPS probe is completely wrapped by the side surface and the top surface of the plastic scintillator 10, and the whole monitoring module is surrounded by the lead chamber 17 by adopting a physical shielding method. The lead chambers 17 are connected by a self-locking mechanism. The PIPS detector 2 is positioned right above the sample tray 15 and is used for directly measuring alpha and beta rays of a sample, and the PIPS detector 2 can perform activity measurement in the environment of the lead chamber 17; the upper plastic scintillator 10 is matched with the anti-coincidence detector 30 to eliminate high-energy ray interference such as gamma particles.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of carrying out the utility model and that various changes in form and details may be made therein without departing from the spirit and scope of the utility model.
Claims (8)
1. A PIPS anti-coincidence structure comprising:
a detector bracket;
the PIPS detector is arranged on the detector bracket;
a shielding device, the PIPS detector is arranged in the shielding device,
an anti-coincidence detector, which is arranged in the shielding device;
the sample device is arranged below the PIPS detector;
when the PIPS detector detects a sample placed on the sample device, the PIPS detector only responds to gamma rays when responding to alpha particles, beta particles and gamma particles, and the anti-coincidence detector only responds to gamma rays, so that the influence of gamma particles in the environment on the measurement results of the alpha particles and the beta particles is anti-coincidence.
2. The PIPS anti-coincidence structure according to claim 1, wherein a front-end amplifying device is arranged at one side of the shielding device, and the PIPS detector is electrically connected with the front-end amplifying device.
3. The PIPS anti-coincidence structure according to claim 2, wherein the sample is directly facing under the PIPS detector; the sample moves left and right along with the sample device, and the sample device sends the sample to the position right below the PIPS detector.
4. The PIPS anticomplement structure according to claim 1, wherein said shielding device further comprises:
a shielding copper housing, which is arranged around the PIPS detector;
a shield copper cover, which is fixed above the shield copper cover; the shielding copper housing and the shielding copper cover form a closed frame;
the plastic scintillators are fixed in the closed frame and are distributed on the inner side of the closed frame in an inverted concave mode;
a titanium dioxide coating, which is coated on the plastic scintillator;
and (3) a black paint coating, wherein the black paint coating is coated on the titanium dioxide coating.
5. The PIPS anticomplement structure according to claim 1, wherein the anticomplement detector further comprises:
the photomultiplier is arranged on one side of the shielding copper housing of the shielding device; the photomultiplier tube reflects gamma rays to the plastic scintillator, performs photoelectric conversion and performs multiplication;
a photomultiplier fixing sleeve fixed on the outer side of the shielding copper housing; inserting the photomultiplier tube into the photomultiplier tube fixing sleeve;
the photomultiplier tube clamping sleeve is fixedly connected with the photomultiplier tube fixing sleeve through threads;
a photomultiplier tail plug is arranged in the photomultiplier card sleeve; a compression spring is arranged in the photomultiplier tail insert to compress the photomultiplier and the plastic scintillator; one end of the tail plug of the photomultiplier is connected with the photomultiplier through an insert; the photomultiplier tail plug is connected to the control system.
6. The PIPS anticomplement structure according to claim 3, wherein said sample device further comprises:
a sample tray, which is arranged below the sample; fixing a detector bracket above the sample tray;
and fixing the sample pushing frame below the sample tray.
7. The PIPS anti-coincidence structure according to claim 2, wherein the front end amplifying device is a signal amplifier of a PIPS detector, the front end amplifying device is electrically connected with a control system of the PIPS anti-coincidence structure, and the front end amplifying device is fixed above the detector bracket.
8. The PIPS inverse conforming structure according to any one of claims 1 to 7 wherein a lead compartment is provided outside the PIPS inverse conforming structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320155938.5U CN219676304U (en) | 2023-01-18 | 2023-01-18 | PIPS anti-coincidence structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320155938.5U CN219676304U (en) | 2023-01-18 | 2023-01-18 | PIPS anti-coincidence structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219676304U true CN219676304U (en) | 2023-09-12 |
Family
ID=87927635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320155938.5U Active CN219676304U (en) | 2023-01-18 | 2023-01-18 | PIPS anti-coincidence structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219676304U (en) |
-
2023
- 2023-01-18 CN CN202320155938.5U patent/CN219676304U/en active Active
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