CN103698797A - Beta surface polluted-position resolution detector - Google Patents
Beta surface polluted-position resolution detector Download PDFInfo
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- CN103698797A CN103698797A CN201310742992.0A CN201310742992A CN103698797A CN 103698797 A CN103698797 A CN 103698797A CN 201310742992 A CN201310742992 A CN 201310742992A CN 103698797 A CN103698797 A CN 103698797A
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- wavelength conversion
- light wavelength
- organic glass
- plastic scintillant
- position resolution
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Abstract
The invention belongs to the technical field of the radioactive pollution monitoring, and discloses a beta surface polluted-position resolution detector. The detector comprises an incidence window, wavelength conversion optical fibers, a plastic flash body, organic glass and a photoelectric multiplying pipe, wherein the plastic flash body is tightly bonded with the organic glass, the plastic flash body is arranged on the lower side of the organic glass, and the incidence window is arranged on the lower surface of the plastic flash body; the wavelength conversion optical fibers are distributed on the organic glass and the plastic flash body in the longitudinal direction and the transverse direction at equal intervals side by side. The detector has the advantages of convenience in carrying, simplicity in installation and debugging, large detection sensitive area and capability of realizing the position resolution detection.
Description
Technical field
The invention belongs to radioactive pollution monitoring technical field, be specifically related to a kind of β surface contamination position resolution detector.
Background technology
Beta activity surface monitoring is an important content in Radiation Protection Monitoring.The detector that present stage is used for beta activity surface monitoring mainly contains gas detector and scintillator detector, as proportional counter tube and plastic scintillant etc.Along with the development of detector technology, increased the method and apparatus that utilizes semiconductor detector array, GM pipe etc. to survey beta activity surface contamination in recent years.Scintillator detector, carrying portable low to environmental requirement wherein, and before using without the Installation and Debugging through complicated, in the middle of the Measurement of surface contamination of present stage, use more extensive.But, for current existing plastic scintillator detector, all exist sensitive detection area little, determine that the surface contamination on large surface needs the time longer, be not suitable for the surface contamination Quick Measurement under accident conditions.And when increasing sensitive detection area, easily cause again the series of problems such as accurate distribution that reduce, cannot provide the internal contamination of sensitive detection area such as the detectable lower limit for inhomogeneous pollution.
Hou Jie etc. disclose the surface contamination analyzer that is applicable to large area beta activity surface monitoring that utilizes plastic scintillant to combine with light wavelength conversion fibre in < < Optical Fiber Transmission surface contamination research > > mono-literary composition, in this article, disclosed pollution instrument is that some light wavelength conversions fibres are equidistantly embedded on the organic glass of plastic scintillant below equably, and the output terminal of all light wavelength conversion fibres is accumulated to optical cable by plastics Transmission Fibers, then optical cable is connected with photomultiplier and realizes large-area total beta activity surface monitoring.This surface contamination instrument sensitive detection area is large, and the distribution that still can not provide the pollution of sensitive detection area inside surface is position resolution information, therefore, is badly in need of a kind of position resolution detector that is applicable to the surface contamination of large area beta activity of development.
Summary of the invention
(1) goal of the invention
The problem existing according to prior art, the invention provides a kind of easy to carry, Installation and Debugging simple, it is large and can realize the β surface contamination position resolution detector that position resolution is surveyed to survey sensitive area.
(2) technical scheme
In order to solve the existing problem of prior art, technical scheme provided by the invention is as follows:
β surface contamination position resolution detector, key is, this detector comprises entrance window, light wavelength conversion fibre, 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 light wavelength conversion fibre is distributed on the both direction in length and breadth of organic glass and plastic scintillant side by side, equally spacedly, and wherein, on longitudinal direction, light wavelength conversion fibre is embedded in the groove of plastic scintillant below side by side, equally spacedly; In the transverse direction, light wavelength conversion fibre is embedded in the groove between plastic scintillant and organic glass side by side, equally spacedly; Light wavelength conversion fibre on both direction is divided into by plastic scintillant the territory element that several areas are identical with shape in length and breadth.
Described light wavelength conversion fibre is connected with photomultiplier by optic splice respectively, photomultiplier is converted to electric signal by the light signal of the fine output of light wavelength conversion, 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 amplification; Meanwhile, the signal time information of prime amplifier output is introduced discriminator, coincidence apparatus successively, and the output signal of coincidence apparatus 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 mirror plane reflection horizon, to improve light collection efficiency;
Preferably, the sidewall after described plastic scintillant and organic glass fit tightly is provided with optical mirror plane reflection horizon, to improve light collection efficiency;
Preferably, the quantity of described longitudinally upper light wavelength conversion fibre is more than 2, and transversely the quantity of light wavelength conversion fibre is more than 2.
Preferably, described light wavelength conversion fibre is distributed on the both direction in length and breadth of organic glass and plastic scintillant side by side, equally spacedly, and wherein in the transverse direction, light wavelength conversion fibre is embedded in the groove of plastic scintillant below side by side, equally spacedly; On longitudinal direction, light wavelength conversion fibre is embedded in the groove between plastic scintillant and organic glass side by side, equally spacedly; The two light wavelength conversion fibres that make progress are divided into by plastic scintillant the region that several areas are identical with shape in length and breadth.
β surface contamination position resolution measuring method, the method is to utilize β surface contamination position resolution detector to measure beta activity surface contamination source, the method comprises the following steps:
(1) position relationship typical curve obtains
Order is chosen on the plastic scintillant of β surface contamination position resolution detector by each territory element in fine several areas divided of light wavelength conversion territory element identical with shape; Mobile radiator beta-ray on the surface of the plastic scintillant in this territory element, while measuring the diverse location of radiator beta-ray in this territory element, surround the signal amplitude of two horizontal wavelength conversion optical fiber and the signal amplitude of two longitudinal wavelength conversion optical fiber of this territory element simultaneously; According to the signal amplitude ratio of two horizontal wavelength conversion optical fiber, radiator beta-ray, apart from the distance of in two horizontal wavelength conversion optical fiber, make the typical curve of horizontal Amplitude Ratio and relative distance; According to the signal amplitude ratio of two longitudinal wavelength conversion optical fiber, radiator beta-ray, apart from the distance of in two longitudinal wavelength conversion optical fiber, make the typical curve of longitudinal Amplitude Ratio and relative distance;
(2) measurement of beta activity surface contamination
Utilize β surface contamination position resolution detector to measure beta activity surface contamination source, first monitor the signal amplitude of the fine output of every light wavelength conversion, according to the power of signal, tentatively determine the territory element at place, beta activity surface contamination source, and then measure the signal amplitude ratio of the horizontal wavelength conversion of in this territory element two optical fiber, the signal amplitude ratio of two longitudinal wavelength conversion optical fiber, the typical curve of the typical curve of the corresponding laterally Amplitude Ratio described in difference substitution step (1) and relative distance and longitudinally Amplitude Ratio and relative distance, obtain the accurate location in beta activity surface contamination source.
Preferably, can also sequentially choose on the plastic scintillant of β surface contamination position resolution detector by each territory element in fine several areas divided of light wavelength conversion territory element identical with shape; The radiator beta-ray of mobile known activity on the surface of the plastic scintillant in this territory element while measuring the diverse location of radiator beta-ray in this territory element, surrounds the coincidence counting rate of four light wavelength conversion fibres of this territory element simultaneously; According to the coincidence counting rate of four optical fiber, radiator beta-ray, apart from the relative distance of four long wavelength fibers, make detection efficiency curve.
(3) beneficial effect
β surface contamination position resolution detector provided by the invention, this detector comprises large area plastic scintillant, the organic glass fitting tightly and is distributed in plastic scintillant that the light wavelength conversion in direction is fine in length and breadth, this detector has following beneficial effect:
1) can when the surface contamination of β ray is surveyed, realize position resolution surveys
The difference of the relative position of two light wavelength conversion fibres of two directions in length and breadth that are adjacent respectively due to β ray incoming position can cause the fluorescent photon quantity that two light wavelength conversion fibres are collected to have different (, after opto-electronic conversion, the amplitude of output pulse has different).The variation of the ratio of the average amplitude of corresponding signal output pulse on different wave length conversion optical fiber layer, realizes the position resolution of β surface contamination and measures when recording particle incident.
2) detector sensitivity and light collection efficiency are high
Decay and the propagation distance of photon in plastic scintillant is exponential distribution, the photon numbers that can be collected into is and the distance dependent of light collection device apart from ray incidence point, therefore on the both direction in length and breadth of detector, light wavelength conversion fibre is set, can improves detector sensitivity.
In addition, for relatively thin large area plastic scintillant, no matter whether establish reflection layer at the upper surface of organic glass, there is partly flickering light in capital from the side outgoing of plastic scintillant, therefore, light wavelength conversion line is laid in to plastic scintillant inside, can significantly improves light collection efficiency and the detector sensitivity of detector, also can better obtain the positional information that β pollutes simultaneously.
3) can provide the total activity of beta activity surface contamination
With the radiator beta-ray of known activity, obtain carrying out at the diverse location place of detector the scale of detection efficiency curve, obtain the detection efficiency curve of diverse location place detector, therefore, detector, judging on the basis of β surface contamination position, is obtained the total activity of β surface contamination by the detection efficiency weighting to diverse location.
Accompanying drawing explanation
Fig. 1 is β surface contamination position resolution detector schematic diagram;
Wherein 1 is organic glass, the 2nd, and plastic scintillant, the 3rd, photomultiplier, the 4th, optic splice, the 5th, light wavelength conversion is fine
Fig. 2 is β surface contamination position resolution detector longitudinal profile schematic diagram;
Wherein 1 is organic glass, the 2nd, and plastic scintillant, the 6th, optical glue, the 7th, horizontal wavelength conversion optical fiber, the 8th, entrance window;
Fig. 3 is β surface contamination position resolution detector horizontal section schematic diagram;
Wherein 1 is organic glass, the 2nd, and plastic scintillant, the 6th, optical glue, the 8th, entrance window, the 9th, longitudinal wavelength conversion optical fiber.
Embodiment
Below in conjunction with specification drawings and specific embodiments, the present invention is further elaborated.
β surface contamination position resolution detector, as shown in Figure 1, this detector comprises entrance window, light wavelength conversion fibre 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;
Light wavelength conversion fibre 5 is distributed on 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, light wavelength conversion fibre is embedded in the groove of plastic scintillant 2 belows side by side, equally spacedly; In the transverse direction, light wavelength conversion fibre is embedded in the groove between plastic scintillant 2 and organic glass 1 side by side, equally spacedly; Light wavelength conversion fibre 5 on both direction is divided into by plastic scintillant 2 territory element that several areas are identical with shape in length and breadth.Light wavelength conversion fibre 5 is connected with photomultiplier 3 by optic splice 4 respectively, photomultiplier 3 is converted to electric signal by the light signal of fine 5 outputs of light wavelength conversion, 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 amplification; Meanwhile, the signal time information of prime amplifier output is introduced discriminator, coincidence apparatus successively, and the output signal of coincidence apparatus is introduced into modulus collector and as the trigger pip of modulus collector.
The thickness of the plastic scintillant 2 shown in Fig. 1 is 1.5mm, the thickness of organic glass 1 is 3mm, sidewall after the upper surface of organic glass 1, plastic scintillant 2 fit tightly with organic glass 1 is provided with optical mirror plane reflection horizon, to improve light collection efficiency, the quantity of the light wavelength conversion fibre in longitudinal and transverse two directions is 3, and diameter is 1mm.Plastic scintillant and the organic glass in length and breadth length of both direction are respectively 40cm, 30cm.
Fig. 2 is β surface contamination position resolution detector longitudinal profile schematic diagram;
Fig. 3 is β surface contamination position resolution detector horizontal section schematic diagram;
Utilize this detector to carry out method and principle that β surface contamination monitors to be:
(1) order is chosen on the plastic scintillant of β surface contamination position resolution detector by each territory element in fine several areas divided of light wavelength conversion territory element identical with shape; Mobile radiator beta-ray on the surface of the plastic scintillant in this territory element, while measuring the diverse location of radiator beta-ray in this territory element, surround the signal amplitude of two horizontal wavelength conversion optical fiber and the signal amplitude of two longitudinal wavelength conversion optical fiber of this territory element simultaneously; According to the signal amplitude ratio of two horizontal wavelength conversion optical fiber, radiator beta-ray, apart from the distance of in two horizontal wavelength conversion optical fiber, make the typical curve of horizontal Amplitude Ratio and relative distance; According to the signal amplitude ratio of two longitudinal wavelength conversion optical fiber, radiator beta-ray, apart from the distance of in two longitudinal wavelength conversion optical fiber, make the typical curve of longitudinal Amplitude Ratio and relative distance;
(2) measurement of beta activity surface contamination
Utilize β surface contamination position resolution detector to measure beta activity surface contamination source, first monitor the signal amplitude of the fine output of every light wavelength conversion, according to the power of signal, tentatively determine the territory element at place, beta activity surface contamination source, and then measure the signal amplitude ratio of the horizontal wavelength conversion of in this territory element two optical fiber, the signal amplitude ratio of two longitudinal wavelength conversion optical fiber, the typical curve of the typical curve of the corresponding laterally Amplitude Ratio described in difference substitution step (1) and relative distance and longitudinally Amplitude Ratio and relative distance, obtain the accurate location in beta activity surface contamination source.
Utilize this detector to carry out the accuracy of β surface contamination detection high, for the position resolution of β surface contamination, measure.
Detector and the measuring method used with embodiment 1 are identical, different, and the thickness of organic glass is 5mm, and light wavelength conversion fibre is embedded in the groove of plastic scintillant below in the transverse direction side by side, equally spacedly; On longitudinal direction, be embedded in side by side, equally spacedly in the groove between plastic scintillant and organic glass; The two light wavelength conversion fibres that make progress are divided into by plastic scintillant the region that several areas are identical with shape in length and breadth.
Detector and the measuring method used with embodiment 1 are identical, different, in length and breadth two to light wavelength conversion fibre be respectively 4 and 5.
Claims (7)
1. β surface contamination position resolution detector, it is characterized in that, this detector comprises entrance window, light wavelength conversion fibre, 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 light wavelength conversion fibre is distributed on the both direction in length and breadth of organic glass and plastic scintillant side by side, equally spacedly, and wherein, on longitudinal direction, light wavelength conversion fibre is embedded in the groove of plastic scintillant below side by side, equally spacedly; In the transverse direction, light wavelength conversion fibre is embedded in the groove between plastic scintillant and organic glass side by side, equally spacedly; Light wavelength conversion fibre on both direction is divided into by plastic scintillant the territory element that several areas are identical with shape in length and breadth;
Described light wavelength conversion fibre is connected with photomultiplier by optic splice respectively, photomultiplier is converted to electric signal by the light signal of the fine output of light wavelength conversion, 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 amplification; Meanwhile, the signal time information of prime amplifier output is introduced discriminator, coincidence apparatus successively, and the output signal of coincidence apparatus is introduced into modulus collector and as the trigger pip of modulus collector.
2. β surface contamination position resolution detector according to claim 1, is characterized in that, the thickness of described plastic scintillant is 1.5mm.
3. β surface contamination position resolution detector according to claim 1, is characterized in that, the thickness of described organic glass is 3～5mm.
4. β surface contamination position resolution detector according to claim 1, is characterized in that, the upper surface of described organic glass is provided with optical mirror plane reflection horizon, to improve light collection efficiency.
5. β surface contamination position resolution detector according to claim 1, is characterized in that, the sidewall after described plastic scintillant and organic glass fit tightly is provided with optical mirror plane reflection horizon, to improve light collection efficiency.
6. β surface contamination position resolution detector according to claim 1, is characterized in that, the quantity of described longitudinally upper light wavelength conversion fibre is more than 2, and transversely the quantity of light wavelength conversion fibre is more than 2.
7. β surface contamination position resolution detector according to claim 1, it is characterized in that, described light wavelength conversion fibre is distributed on the both direction in length and breadth of organic glass and plastic scintillant side by side, equally spacedly, wherein in the transverse direction, light wavelength conversion fibre is embedded in the groove of plastic scintillant below side by side, equally spacedly; On longitudinal direction, light wavelength conversion fibre is embedded in the groove between plastic scintillant and organic glass side by side, equally spacedly; The two light wavelength conversion fibres that make progress are divided into by plastic scintillant the region that several areas are identical with shape in length and breadth.
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| CN201310742992.0A CN103698797A (en) | 2013-12-30 | 2013-12-30 | Beta surface polluted-position resolution detector |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104035123A (en) * | 2014-06-27 | 2014-09-10 | 中国电子科技集团公司第八研究所 | Beta surface contamination detection device and method based on scintillant and optical fiber coupling |
| WO2019062253A1 (en) * | 2017-09-27 | 2019-04-04 | 清华大学 | Array-type large-area total radioactivity detection device |
| CN112114345A (en) * | 2020-07-28 | 2020-12-22 | 中国原子能科学研究院 | Device and method for directly measuring radioactivity in soil |
| CN112530140A (en) * | 2020-12-02 | 2021-03-19 | 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 |
| CN116859438A (en) * | 2023-06-29 | 2023-10-10 | 黑龙江省原子能研究院 | Instantaneous weak radiation signal detection device and method thereof |
| CN116859438B (en) * | 2023-06-29 | 2024-06-11 | 黑龙江省原子能研究院 | Instantaneous weak radiation signal detection device and method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104035123A (en) * | 2014-06-27 | 2014-09-10 | 中国电子科技集团公司第八研究所 | Beta surface contamination detection device and method based on scintillant and optical fiber coupling |
| WO2019062253A1 (en) * | 2017-09-27 | 2019-04-04 | 清华大学 | Array-type large-area total radioactivity detection device |
| CN112114345A (en) * | 2020-07-28 | 2020-12-22 | 中国原子能科学研究院 | Device and method for directly measuring radioactivity in soil |
| CN112530140A (en) * | 2020-12-02 | 2021-03-19 | 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 |
| 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 |
| CN116859438A (en) * | 2023-06-29 | 2023-10-10 | 黑龙江省原子能研究院 | Instantaneous weak radiation signal detection device and method thereof |
| CN116859438B (en) * | 2023-06-29 | 2024-06-11 | 黑龙江省原子能研究院 | Instantaneous weak radiation signal detection device and method thereof |
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Application publication date: 20140402 |