CN103698798B - β surface contamination position resolution measuring method - Google Patents
β surface contamination position resolution measuring method Download PDFInfo
- Publication number
- CN103698798B CN103698798B CN201310743109.XA CN201310743109A CN103698798B CN 103698798 B CN103698798 B CN 103698798B CN 201310743109 A CN201310743109 A CN 201310743109A CN 103698798 B CN103698798 B CN 103698798B
- Authority
- CN
- China
- Prior art keywords
- surface contamination
- wavelength
- position resolution
- amplitude ratio
- territory element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Measurement Of Radiation (AREA)
Abstract
The invention belongs to radioactive pollution monitoring technical field, disclose a kind of β surface contamination position resolution measuring method.The method utilizes β surface contamination position resolution detector to detect beta activity surface contamination, and it comprises the acquisition of position relationship typical curve and measurement two steps of beta activity surface contamination.The method has simply, detection limit is low, detect that sensitive area is large, measuring speed is fast and accurately can provides the advantage polluting positional information.
Description
Technical field
The invention belongs to radioactive pollution monitoring technical field, be specifically related to a kind of β surface contamination position resolution measuring method.
Background technology
Beta activity surface monitoring is an important content in Radiation Protection Monitoring.For the β ray surface contamination Quick Measurement under accident conditions, require β surface contamination detector have sensitive area large, be easy to carry, low to environmental requirement, accuracy of measurement is high, to determine to pollute on-the-spot scope, pollute focus and pollution level.
The measuring method of present stage widely used β surface contamination utilizes gas detector, scintillator detector, semiconductor detector array or GM pipe to measure β ray.Compared with other β surface contamination detectors, plastic scintillator detector is low to environmental requirement, carrying portable, measurement, accuracy are high, and without the need to through complicated Installation and Debugging before using, be expected to be applicable to the β ray Measurement of surface contamination under accident conditions.But, while increase plastic scintillator detector sensitive detection area, be difficult to again the accurate distribution providing the internal contamination of sensitive detection area.Such as Hou Jie etc. disclose the method being applicable to large area β Measurement of surface contamination utilizing plastic scintillant to combine with wavelength convert optical fiber in " Optical Fiber Transmission surface contamination research " literary composition, polluting instrument disclosed in this article is equidistantly embedded by some wavelength convert optical fiber on the organic glass below plastic scintillant equably, and the output terminal of all wavelength convert optical fiber is accumulated optical cable by plastics Transmission Fibers, then optical cable is connected with photomultiplier and realizes large-area total β surface monitoring.This measuring method surface contamination instrument sensitive detection area used is large, but can not provide distribution and position resolution information that sensitive detection area inside surface pollutes, therefore, is badly in need of a kind of position resolution measuring method being applicable to large area β surface contamination of research.
Summary of the invention
(1) goal of the invention
Problem existing for prior art, the invention provides that a kind of measuring method is simple, detection limit is low, detects that sensitive area is large, measuring speed fast and accurately can provide the β surface contamination position resolution measuring method polluting positional information.
(2) technical scheme
In order to solve the problem existing for prior art, the present invention is achieved by the following technical solutions:
β surface contamination position resolution detector, key is, this detector comprises entrance window, wavelength convert optical fiber, plastic scintillant, organic glass, photomultiplier, wherein plastic scintillant and organic glass fit tightly, plastic scintillant is positioned at the below of organic glass, and entrance window is positioned at the lower surface of plastic scintillant;
Described wavelength convert optical fiber is distributed in the both direction in length and breadth of organic glass and plastic scintillant side by side, equally spacedly, and wherein on longitudinal direction, wavelength convert optical fiber is embedded in the groove below plastic scintillant side by side, equally spacedly; In the transverse direction, wavelength convert optical fiber is embedded in the groove between plastic scintillant and organic glass side by side, equally spacedly; Plastic scintillant is divided into several areas territory element identical with shape by the wavelength convert optical fiber in length and breadth in both direction.
Described wavelength convert optical fiber is connected with photomultiplier respectively by optic splice, the light signal that wavelength convert optical fiber exports is converted to electric signal by photomultiplier, and this electric signal is converted into the simulating signal that amplitude can meet the requirement of modulus collector after prime amplifier and linear amplifier amplify; Meanwhile, the signal time information that prime amplifier exports is introduced discriminator successively, is met device, and the output signal meeting device is introduced into modulus collector and as the trigger pip of modulus collector.
Preferably, the thickness of described plastic scintillant is 1.5mm;
Preferably, the thickness of described organic glass is 3 ~ 5mm;
Preferably, the upper surface of described organic glass is provided with optical specular reflection layer, to improve light collection efficiency;
Preferably, the sidewall after described plastic scintillant and organic glass fit tightly is provided with optical specular reflection layer, to improve light collection efficiency;
Preferably, in described longitudinal direction, the quantity of wavelength convert optical fiber is more than 2, and transversely the quantity of wavelength convert optical fiber is more than 2.
Preferably, described wavelength convert optical fiber is distributed in the both direction in length and breadth of organic glass and plastic scintillant side by side, equally spacedly, and wherein in the transverse direction, wavelength convert optical fiber is embedded in the groove below plastic scintillant side by side, equally spacedly; On longitudinal direction, wavelength convert optical fiber is embedded in the groove between plastic scintillant and organic glass side by side, equally spacedly; Plastic scintillant is divided into several areas region identical with shape by two wavelength convert optical fiber upwards in length and breadth.
β surface contamination position resolution measuring method, the method utilizes β surface contamination position resolution detector to measure beta activity surface contamination source, and the method comprises the following steps:
(1) acquisition of position relationship typical curve
Each territory element in the territory element that several areas that the plastic scintillant that order chooses β surface contamination position resolution detector is divided by wavelength convert optical fiber are identical with shape; Mobile radiator beta-ray on the surface of the plastic scintillant in this territory element, when measurement radiator beta-ray is in the diverse location of this territory element simultaneously, surround the signal amplitude of two horizontal wavelength upconversion fiber of this territory element and the signal amplitude of two longitudinal wavelength upconversion fiber; The typical curve of horizontal Amplitude Ratio and relative distance is made according to the signal amplitude ratio of two horizontal wavelength upconversion fiber, the distance of of radiator beta-ray in two horizontal wavelength upconversion fiber; The typical curve of longitudinal Amplitude Ratio and relative distance is made according to the signal amplitude ratio of two longitudinal wavelength upconversion fiber, the distance of of radiator beta-ray in two longitudinal wavelength upconversion fiber;
(2) measurement of beta activity surface contamination
β surface contamination position resolution detector is utilized to measure beta activity surface contamination source, first the signal amplitude that every root wavelength convert optical fiber exports is monitored, the territory element at place, beta activity surface contamination source is tentatively determined according to the power of signal, and then measure the signal amplitude ratio of two horizontal wavelength upconversion fiber in this territory element, the signal amplitude ratio of two longitudinal wavelength upconversion fiber, substitute into the typical curve of the corresponding horizontal Amplitude Ratio described in step (1) and relative distance and the typical curve of longitudinal Amplitude Ratio and relative distance respectively, obtain the accurate location in beta activity surface contamination source.
Preferably, each territory element in the territory element that several areas that the plastic scintillant sequentially can also choosing β surface contamination position resolution detector is divided by wavelength convert optical fiber are identical with shape; The radiator beta-ray of mobile known activity on the surface of the plastic scintillant in this territory element, when measurement radiator beta-ray is in the diverse location of this territory element simultaneously, surrounds the coincidence counting rate of four wavelength convert optical fiber of this territory element; Detection efficiency curve is made according to the coincidence counting rate of four optical fiber, the relative distance of radiator beta-ray distance four long wavelength fibers.
Preferably, the thickness of described plastic scintillant is 1.5mm;
Preferably, the quantity of described two wavelength convert optical fiber upwards is in length and breadth more than 2;
(3) beneficial effect
β surface contamination position resolution measuring method provided by the invention, the method utilizes β surface contamination position resolution detector, adopts the method met to measure beta activity surface contamination, has following beneficial effect:
1) accurate location information at place, beta activity surface contamination source can be provided
When utilizing β surface contamination position resolution detector to detect β surface contamination source, first the territory element at place, beta activity surface contamination source is tentatively determined according to the power of wavelength convert optical fiber output signal, and then measure the signal amplitude ratio of two horizontal wavelength upconversion fiber in this territory element, the signal amplitude ratio of two longitudinal wavelength upconversion fiber, substitute into respectively in horizontal typical curve and longitudinal typical curve, obtain the accurate location in beta activity surface contamination source.
2) detection sensitivity of β surface contamination position resolution detector used is high and light collection efficiency is high
The detector that the method is used, its wavelength convert optical fiber is positioned in the groove between groove, plastic scintillant and organic glass below plastic scintillant respectively, light collection efficiency and the detector sensitivity of detector can be significantly improved, also better can obtain the positional information that β pollutes simultaneously.
3) total activity of beta activity surface contamination can be provided
The scale carrying out detection efficiency curve at the diverse location place of detector is obtained with the radiator beta-ray of known activity, obtain the detection efficiency curve of diverse location place detector, therefore, the method, can also by obtaining the total activity of β surface contamination on the basis judging β surface contamination position to the detection efficiency weighting of diverse location.
Accompanying drawing explanation
Fig. 1 is β surface contamination position resolution measuring method schematic diagram;
Fig. 2 is β surface contamination position resolution detector schematic diagram;
Wherein 1 is organic glass, and 2 is plastic scintillants, and 3 is photomultipliers, and 4 is optic splices, and 5 is wavelength convert optical fiber
Fig. 3 is β surface contamination position resolution detector longitudinal profile schematic diagram;
Wherein 1 is organic glass, and 2 is plastic scintillants, and 6 is optical glue, and 7 is horizontal wavelength upconversion fiber, and 8 is entrance windows;
Fig. 4 is β surface contamination position resolution detector horizontal section schematic diagram;
Wherein 1 is organic glass, and 2 is plastic scintillants, and 6 is optical glue, and 8 is entrance windows, and 9 is longitudinal wavelength upconversion fiber.
Embodiment
Below in conjunction with specification drawings and specific embodiments, the present invention is further elaborated.
Embodiment 1
β surface contamination position resolution measuring method, as shown in Figure 1, to method schematic diagram the method utilize β surface contamination position resolution detector to measure beta activity surface contamination source, and it comprises the following steps:
(1) acquisition of position relationship typical curve
Each territory element in the territory element that several areas that the plastic scintillant that order chooses β surface contamination position resolution detector is divided by wavelength convert optical fiber are identical with shape; Mobile radiator beta-ray on the surface of the plastic scintillant in this territory element, when measurement radiator beta-ray is in the diverse location of this territory element simultaneously, surround the signal amplitude of two horizontal wavelength upconversion fiber of this territory element and the signal amplitude of two longitudinal wavelength upconversion fiber; The typical curve of horizontal Amplitude Ratio and relative distance is made according to the signal amplitude ratio of two horizontal wavelength upconversion fiber, the distance of of radiator beta-ray in two horizontal wavelength upconversion fiber; The typical curve of longitudinal Amplitude Ratio and relative distance is made according to the signal amplitude ratio of two longitudinal wavelength upconversion fiber, the distance of of radiator beta-ray in two longitudinal wavelength upconversion fiber;
Radiator beta-ray used is that diameter is about 1cm's
90sr point source, the Measuring Time measured when radiator beta-ray is in the diverse location of this territory element is 10min.The Changing Pattern of the typical curve of the horizontal Amplitude Ratio of each territory element and the canonical plotting of relative distance and longitudinal Amplitude Ratio and relative distance is close to consistent, all presents polynomial expression variation relation.
(2) measurement of beta activity surface contamination
β surface contamination position resolution detector is utilized to measure beta activity surface contamination source, first the signal amplitude that every root wavelength convert optical fiber exports is monitored, the territory element at place, beta activity surface contamination source is tentatively determined according to the power of signal, and then measure the signal amplitude ratio of two horizontal wavelength upconversion fiber in this territory element, the signal amplitude ratio of two longitudinal wavelength upconversion fiber, substitute into the typical curve of the corresponding horizontal Amplitude Ratio described in step (1) and relative distance and the typical curve of longitudinal Amplitude Ratio and relative distance respectively, obtain the accurate location in beta activity surface contamination source.
β surface contamination position resolution detector used as shown in Figure 2, this detector comprises entrance window, wavelength convert optical fiber 5, plastic scintillant 2, organic glass 1, photomultiplier 3, wherein plastic scintillant 2 and organic glass 1 fit tightly, plastic scintillant 2 is positioned at the below of organic glass 1, and entrance window is positioned at the lower surface of plastic scintillant 2;
Wavelength convert optical fiber 5 is distributed in the both direction in length and breadth of organic glass 1 and plastic scintillant 2 side by side, equally spacedly, and wherein on longitudinal direction, wavelength convert optical fiber is embedded in the groove below plastic scintillant 2 side by side, equally spacedly; In the transverse direction, wavelength convert optical fiber is embedded in the groove between plastic scintillant 2 and organic glass 1 side by side, equally spacedly; Plastic scintillant 2 is divided into several areas territory element identical with shape by the wavelength convert optical fiber 5 in length and breadth in both direction.Wavelength convert optical fiber 5 is connected with photomultiplier 3 respectively by optic splice 4, the light signal that wavelength convert optical fiber 5 exports is converted to electric signal by photomultiplier 3, and this electric signal is converted into the simulating signal that amplitude can meet the requirement of modulus collector after prime amplifier and linear amplifier amplify; Meanwhile, the signal time information that prime amplifier exports is introduced discriminator successively, is met device, and the output signal meeting device is introduced into modulus collector and as the trigger pip of modulus collector.
The thickness of the plastic scintillant 2 shown in Fig. 2 is 1.5mm, the thickness of organic glass 1 is 3mm, the upper surface of organic glass 1, plastic scintillant 2 are provided with optical specular reflection layer with the sidewall after organic glass 1 fits tightly, to improve light collection efficiency, the quantity of the wavelength convert optical fiber in longitudinal and transverse two directions is 3, and diameter is 1mm.The length of plastic scintillant and organic glass both direction is in length and breadth respectively 40cm, 30cm.
Fig. 3 is β surface contamination position resolution detector longitudinal profile schematic diagram;
Fig. 4 is β surface contamination position resolution detector horizontal section schematic diagram;
Embodiment 2
The method used with embodiment 1 is identical with detector, unlike each territory element in the territory element that several areas that the plastic scintillant sequentially can also choosing β surface contamination position resolution detector is divided by wavelength convert optical fiber are identical with shape; The radiator beta-ray of mobile known activity on the surface of the plastic scintillant in this territory element, when measurement radiator beta-ray is in the diverse location of this territory element simultaneously, surrounds the coincidence counting rate of four wavelength convert optical fiber of this territory element; Detection efficiency curve is made according to the coincidence counting rate of four optical fiber, the relative distance of radiator beta-ray distance four long wavelength fibers.Therefore, detector on the basis judging β surface contamination position, by obtaining the total activity of β surface contamination to the detection efficiency weighting of diverse location.
Claims (3)
1. β surface contamination position resolution measuring method, the method utilizes β surface contamination position resolution detector to measure beta activity surface contamination source, and it is characterized in that, the method comprises the following steps:
(1) acquisition of position relationship typical curve
Each territory element in the territory element that several areas that the plastic scintillant that order chooses β surface contamination position resolution detector is divided by wavelength convert optical fiber are identical with shape; Mobile radiator beta-ray on the surface of the plastic scintillant in this territory element, when measurement radiator beta-ray is in the diverse location of this territory element simultaneously, surround the signal amplitude of two horizontal wavelength upconversion fiber of this territory element and the signal amplitude of two longitudinal wavelength upconversion fiber; The typical curve of horizontal Amplitude Ratio and relative distance is made according to the signal amplitude ratio of two horizontal wavelength upconversion fiber, the distance of of radiator beta-ray in two horizontal wavelength upconversion fiber; The typical curve of longitudinal Amplitude Ratio and relative distance is made according to the signal amplitude ratio of two longitudinal wavelength upconversion fiber, the distance of of radiator beta-ray in two longitudinal wavelength upconversion fiber;
(2) measurement of beta activity surface contamination
β surface contamination position resolution detector is utilized to measure beta activity surface contamination source, first the signal amplitude that every root wavelength convert optical fiber exports is monitored, the territory element at place, beta activity surface contamination source is tentatively determined according to the power of signal, and then measure the signal amplitude ratio of two horizontal wavelength upconversion fiber in this territory element, the signal amplitude ratio of two longitudinal wavelength upconversion fiber, substitute into the typical curve of the corresponding horizontal Amplitude Ratio described in step (1) and relative distance and the typical curve of longitudinal Amplitude Ratio and relative distance respectively, obtain the accurate location in beta activity surface contamination source.
2. β surface contamination position resolution measuring method according to claim 1, is characterized in that, the thickness of described plastic scintillant is 1.5mm.
3. β surface contamination position resolution measuring method according to claim 1, is characterized in that, the quantity of described two wavelength convert optical fiber upwards is in length and breadth more than 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310743109.XA CN103698798B (en) | 2013-12-30 | 2013-12-30 | β surface contamination position resolution measuring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310743109.XA CN103698798B (en) | 2013-12-30 | 2013-12-30 | β surface contamination position resolution measuring method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103698798A CN103698798A (en) | 2014-04-02 |
| CN103698798B true CN103698798B (en) | 2015-12-09 |
Family
ID=50360389
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310743109.XA Active CN103698798B (en) | 2013-12-30 | 2013-12-30 | β surface contamination position resolution measuring method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103698798B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104215994A (en) * | 2014-09-02 | 2014-12-17 | 中国原子能科学研究院 | Location-sensitive detection device for large-area surface contamination |
| CN112530140B (en) * | 2020-12-02 | 2022-05-13 | 中国兵器装备集团自动化研究所 | Joint alarm and pollution area division method based on adjacent position relation of detectors |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5289510A (en) * | 1992-10-23 | 1994-02-22 | Martin Marietta Energy Systems, Inc. | Two-dimensional position sensitive radiation detectors |
| US7863579B2 (en) * | 2007-05-09 | 2011-01-04 | Avraham Suhami | Directional neutron detector |
| CN202102118U (en) * | 2011-06-09 | 2012-01-04 | 中国原子能科学研究院 | Large-area portable Beta surface contamination monitor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1989007257A1 (en) * | 1988-01-26 | 1989-08-10 | Washington University | Fiber optic beam-imaging apparatus and method |
-
2013
- 2013-12-30 CN CN201310743109.XA patent/CN103698798B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5289510A (en) * | 1992-10-23 | 1994-02-22 | Martin Marietta Energy Systems, Inc. | Two-dimensional position sensitive radiation detectors |
| US7863579B2 (en) * | 2007-05-09 | 2011-01-04 | Avraham Suhami | Directional neutron detector |
| CN202102118U (en) * | 2011-06-09 | 2012-01-04 | 中国原子能科学研究院 | Large-area portable Beta surface contamination monitor |
Non-Patent Citations (2)
| Title |
|---|
| High efficiency plastic scintillator detector with wavelength-shifting fiber readout for the GLAST Large Area Telescope;A.A. Moiseev,et.al;《Nuclear Instruments and Methods in Physics Research A》;20070929;第583卷;第372–381页 * |
| 新型β表面污染位置分辨探测器设计;曲延涛，侯杰;《中国原子能科学研究院年报》;20110731;第334页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103698798A (en) | 2014-04-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201421503Y (en) | Handhold neutron-gamma radiation detector | |
| CN104864979A (en) | Correction method of errors measured by distributed raman optical fiber temperature measuring system | |
| CN203465033U (en) | Brillouin distributed type optical-fiber temperature sensor based on wide-spectrum light source | |
| CN103698797A (en) | Beta surface polluted-position resolution detector | |
| CN105353400A (en) | Inlaying source device used for scintillation crystal detector gain automatic control | |
| CN103698798B (en) | β surface contamination position resolution measuring method | |
| CN109579726A (en) | A kind of long gauge length distribution type fiber-optic Brillouin sensing-demodulating system and strain measurement method | |
| CN203673074U (en) | Beta surface contamination position distinguishing detector | |
| CN106706127A (en) | SiPM-based multi-photon detection method | |
| CN104122231B (en) | On-line self-calibration water quality turbidity detection system | |
| CN103105362A (en) | Multi-range online water quality detector | |
| CN103149180B (en) | Detection method of soil spectral reflectivity and specific conductance | |
| CN204731421U (en) | The particle activity sniffer of α and β | |
| CN201725011U (en) | Alternating Current (AC) measuring device of solar battery quantum efficiency | |
| CN205484803U (en) | Ranging system based on photoelectric sensor | |
| CN104111482A (en) | Double-detector X-ray fluorescence logging probe tube and method | |
| CN101871992A (en) | Alternating current measuring device for quantum efficiency of solar battery and using method thereof | |
| CN109507715B (en) | Multiphase flow full-section phase fraction measuring device and method based on ray coincidence measurement | |
| CN104793228A (en) | Real-time online gamma and electron absorbed dose rate testing system | |
| CN103471817B (en) | A kind of Duo Chang space photometric distribution rapid measurement device and method | |
| CN101893679A (en) | Direct-current measuring device for quantum efficiency of solar cell and using method thereof | |
| CN105044760A (en) | Distributed single-end reflection type on-line radioactivity detecting instrument based on scintillation optical fiber and detecting method thereof | |
| CN104407372A (en) | Beta-ray position detection device and method based on scintillating fibers | |
| CN204116253U (en) | A kind of double detector XRF well logging inserting tube | |
| JP2001141830A (en) | Temperature-compensated type optical transmission form apparatus for measuring radiation and measurement system thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |