CN112285759A - Large-area beta detector with multi-area window and manufacturing method - Google Patents
Large-area beta detector with multi-area window and manufacturing method Download PDFInfo
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- CN112285759A CN112285759A CN202011147259.0A CN202011147259A CN112285759A CN 112285759 A CN112285759 A CN 112285759A CN 202011147259 A CN202011147259 A CN 202011147259A CN 112285759 A CN112285759 A CN 112285759A
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- 238000004519 manufacturing process Methods 0.000 title abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims abstract description 19
- 239000010410 layer Substances 0.000 claims description 19
- 230000005855 radiation Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 239000004033 plastic Substances 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 5
- 239000011241 protective layer Substances 0.000 claims description 5
- 239000000758 substrate Substances 0.000 claims description 5
- 230000005250 beta ray Effects 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 238000004020 luminiscence type Methods 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 description 15
- 238000001514 detection method Methods 0.000 description 9
- 238000004458 analytical method Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005865 ionizing radiation Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/20—Measuring radiation intensity with scintillation detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/20—Measuring radiation intensity with scintillation detectors
- G01T1/208—Circuits specially adapted for scintillation detectors, e.g. for the photo-multiplier section
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- High Energy & Nuclear Physics (AREA)
- Molecular Biology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Measurement Of Radiation (AREA)
Abstract
The invention discloses a large-area beta detector with a multi-region window and a manufacturing method thereof. The invention adopts scintillators with different luminescence decay time to manufacture a ray conversion layer, converts rays into visible light, collects the visible light to a photomultiplier through a light guide cavity, generates photoelectric conversion, generates current pulses with different widths, forms voltage signals with different rise times on a subsequent measuring circuit, and analyzes beta events measured at corresponding positions on a detector by combining a time measuring circuit.
Description
Technical Field
The invention relates to the field of large-area radiation detectors, in particular to a large-area beta detector with a multi-region window and a manufacturing method thereof.
Background
The basic working principle of the large-area plastic flash beta detector is that when a plastic flash sheet of the detector is subjected to ionizing radiation, visible light (the attenuation time is determined by materials) is emitted, reflected by a light guide cavity and collected to a photocathode of a photomultiplier, and then converted and multiplied to output current pulses for subsequent circuit acquisition, analysis and recording.
The large-area plastic flashing beta detector is a novel radiation detector developed after 2005, and is generally used for measuring the radioactivity of human body surface sewage at present due to the advantages of high detection efficiency, strong output signal, large detection area and strong environmental adaptability. The detection area of the human body surface pollution measuring equipment is 15000cm2～18000cm2The number of the used detectors is large, and the single-area window area of the detector is large (400 cm)2Above) without local distinguishing capability, the measurement result is 100cm higher than that in national standard GB87032The area average degree of contamination is calculated to be several times higher, resulting in many unnecessary radiation protection operations; meanwhile, the larger window area and the larger background result in the lifting of the detection limit, and the measurement performance of the equipment is reduced.
Disclosure of Invention
The invention aims to solve the technical problems that the existing single-area window large-area beta detection performance is poor, the background is large, the detection limit is raised, and a plurality of unnecessary radiation protection operations are caused.
The invention is realized by the following technical scheme:
large tracts of land beta detector with multizone window, including protection wire netting lid, protective layer, reflector layer, light guide cavity, ray conversion layer and photomultiplier, ray conversion layer includes a plurality of regions, all is provided with the scintillator in every region, and the scintillator in the different regions has different luminous decay time constant, a plurality of regions are arranged in proper order according to the luminous decay time size of scintillator.
The invention adopts scintillators with different luminescence decay time to manufacture a ray conversion layer, converts rays into visible light, collects the visible light to a photomultiplier through a light guide cavity, generates photoelectric conversion, generates current pulses with different widths, forms voltage signals with different rise times on a subsequent measuring circuit, and analyzes beta events measured at corresponding positions on a detector by combining a time measuring circuit.
Further, the plurality of regions is three.
Further, the plurality of regions are regularly distributed with equal distance and equal size.
Further, the scintillator is a plastic scintillator.
Furthermore, a reflecting layer, a protective layer and a protective net cover are sequentially arranged on one side, far away from the light guide cavity, of the ray conversion layer.
In another implementation manner of the present invention, in the manufacturing method of the large-area β -detector with the multi-region window, the manufacturing steps of the radiation conversion layer are as follows: the scintillators are fixed on a transparent organic glass substrate by adopting optical epoxy resin, a light guide cavity and a photomultiplier tube framework are adopted, a subsequent circuit adopts a rise time and amplitude recognition method, and position information of beta ray action is obtained by analyzing a nuclear pulse signal.
Further, the thickness of the organic glass substrate is 1 mm.
Compared with the prior art, the invention has the following advantages and beneficial effects:
by adopting the single-area window detector with the area of 350mm to 150mm, under the conditions that the number of the light guide cavity and the number of the photomultiplier tubes are not changed and the overall cost is not increased, the number of the measurement areas is changed into a plurality of single-area window detectors, and the area of a single measurement area is reduced to 175cm2More close to 100cm in GB87032The area effectively reduces the measurement error, and the cross-channel ratio of each area is less than 0.1 percent; the background of each measurement area is about 0.33 times of the background of the measurement area, and under the condition that the false alarm rate of the device is unchanged, the detection limit of a single area is 0.57 times of the background of the measurement area.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a side sectional view of a β probe of embodiment 1;
FIG. 2 is an exploded view of a beta detector according to embodiment 1;
fig. 3 is a front top view of the β detector of example 1.
Reference numbers and corresponding part names in the drawings:
the device comprises a 1-ray conversion layer, a 2-light guide cavity, a 3-photomultiplier, a 4-reflecting layer, a 5-protective layer and a 6-protective net cover.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
This embodiment 1 is a large area beta detector with a multi-region window, and the beta detector is shown in fig. 1 in a side sectional view and fig. 2 in a front top view.
The working principle is as follows: the ray conversion layer 1 made of plastic flash sheets with different luminescence decay times is adopted to convert rays into visible light, the visible light is collected to the photomultiplier tube 3 through the light guide cavity 2 to be subjected to photoelectric conversion and multiplication to generate current pulses with different widths, voltage signals with different rise times are formed on a subsequent measurement circuit, and a beta event measured at a corresponding position on the detector is analyzed by the combination time measurement circuit.
Example 1 uses τ1、τ2、τ 33 scintillators with luminous decay time are fixed on a transparent organic glass substrate with the thickness of 1mm by adopting optical epoxy resin as a conversion layer, a light guide cavity and a photomultiplier tube framework are adopted, a subsequent circuit adopts a rise time and amplitude recognition method, and position information of beta ray action is obtained by analyzing a nuclear pulse signal.
The method is characterized in that a conversion layer made of scintillators with 3 kinds of luminescence decay time is adopted, rays are converted into visible light, current pulses with different widths are formed after photoelectric conversion multiplication, and a subsequent circuit adopts a rise time and amplitude analysis method to obtain beta events measured in a corresponding area on a detector.
As shown in fig. 2, the β detector is composed of a light guide cavity 2, a photomultiplier tube 3, a radiation conversion layer 1, a reflective layer 4, a protective layer 5 and a protective mesh cover 6. Wherein the radiation conversion layer of the detection surface is divided into 3 regions, as shown in FIG. 3, in turn defined by the luminescence decay time constant τ1、τ2、τ3When beta rays strike one of the areas, the scintillator of the area emits light signals, finally voltage signals with the rise time related to the light-emitting decay time of the scintillator are generated on a subsequent circuit, and when the analysis circuit records the events, the beta measurement events of the corresponding areas are increased by one. By this method, the detector can identify and detect beta events of 3 regions, and compared with the current common single-region detector, the area of a single measuring region is reduced by 0.33 times, and is closer to 100cm in GB8703 standard2The area effectively reduces the measurement error, and the cross-channel ratio of each area is less than 0.1 percent; the background of each measurement area is about 0.33 times of the background of the measurement area, and under the condition that the false alarm rate of the device is unchanged, the detection limit of a single area is 0.57 times of the background of the measurement area.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. Large tracts of land beta detector with multizone window, its characterized in that, including protection screen cover (6), protective layer (5), reflector layer (4), leaded light chamber (2), ray conversion layer (1) and photomultiplier (3), ray conversion layer (1) includes a plurality of regions, all is provided with the scintillator in every region, and the scintillator in the different regions has different luminous decay time constant, a plurality of regions arrange in proper order according to the luminous decay time size of scintillator.
2. The large area beta detector with multi-region window of claim 1, wherein said plurality of region volumes is three.
3. The large area beta detector with multi-region window of claim 1, wherein said plurality of regions are equidistantly distributed with a regular equal size.
4. The large area beta detector with multi-region window of claim 1, wherein said scintillator is a plastic scintillator.
5. A method for fabricating the large area beta detector with multi-region window as claimed in claim 1, wherein the radiation conversion layer is fabricated by the steps of:
the scintillator is fixed on a transparent organic glass substrate by adopting optical epoxy resin, a light guide cavity and a photomultiplier framework are adopted, a subsequent circuit adopts a rise time and amplitude recognition method, and position information of beta ray action is obtained by analyzing a nuclear pulse signal.
6. The method of claim 5, wherein the thickness of the organic glass substrate is 1 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011147259.0A CN112285759A (en) | 2020-10-23 | 2020-10-23 | Large-area beta detector with multi-area window and manufacturing method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011147259.0A CN112285759A (en) | 2020-10-23 | 2020-10-23 | Large-area beta detector with multi-area window and manufacturing method |
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| CN112285759A true CN112285759A (en) | 2021-01-29 |
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| CN202011147259.0A Pending CN112285759A (en) | 2020-10-23 | 2020-10-23 | Large-area beta detector with multi-area window and manufacturing method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106371128A (en) * | 2016-09-29 | 2017-02-01 | 绵阳市维博电子有限责任公司 | Multi-functional portable surface and underwater radiation pollution detector |
| WO2017038953A1 (en) * | 2015-09-02 | 2017-03-09 | 国立大学法人北海道大学 | Scintillation light detecting device and radiation detecting device |
| CN106547017A (en) * | 2016-11-22 | 2017-03-29 | 清华大学 | A kind of compound scintillator gamma ray spectrometer |
-
2020
- 2020-10-23 CN CN202011147259.0A patent/CN112285759A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017038953A1 (en) * | 2015-09-02 | 2017-03-09 | 国立大学法人北海道大学 | Scintillation light detecting device and radiation detecting device |
| US20180252823A1 (en) * | 2015-09-02 | 2018-09-06 | National University Corporation Hokkaido University | Scintillation light detecting device and radiation detecting device |
| CN106371128A (en) * | 2016-09-29 | 2017-02-01 | 绵阳市维博电子有限责任公司 | Multi-functional portable surface and underwater radiation pollution detector |
| CN106547017A (en) * | 2016-11-22 | 2017-03-29 | 清华大学 | A kind of compound scintillator gamma ray spectrometer |
Non-Patent Citations (1)
| Title |
|---|
| 唐恭富等: "基于大面积复合闪烁体的α、β射线甄别电路设计", 《兵器装备工程学报》 * |
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Effective date of registration: 20220316 Address after: 621000 building 31, No.7, Section 2, Xianren Road, Youxian District, Mianyang City, Sichuan Province Applicant after: China Ordnance Equipment Group Automation Research Institute Co.,Ltd. Address before: 621000 No.98 Youxian East Road, Youxian District, Mianyang City, Sichuan Province Applicant before: MIANYANG WEIBO ELECTRONIC Co.,Ltd. |
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Application publication date: 20210129 |