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High-sensitivity wide-range X-gamma ambient dose equivalent rate monitor probe

A surrounding dose equivalent and wide range technology, applied in the direction of dosimeters, instruments, measuring devices, etc., can solve the problems of not meeting the measurement requirements well, not being able to respond well, and narrowing the range, so as to suppress the excessive response of low-energy photons, The effect of improving the angular response

Active Publication Date: 2012-11-07
上海新漫传感科技有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a high-sensitivity wide-range X-γ peripheral dose equivalent rate meter probe, which is used to solve the existing problems of the existing dose rate meter, such as low instrument sensitivity, low energy response, narrow range, and poor performance. Problems meeting measurement requirements

Method used

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  • High-sensitivity wide-range X-gamma ambient dose equivalent rate monitor probe

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Experimental program
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Embodiment 1

[0033] In this embodiment, the probe front cover 1 is made of stainless steel, the shielding shell 2 is made of aluminum, and the first light guide 4 and the first light guide 7 are made of optical-grade silicone oil. The size of the thallium-doped sodium iodide scintillator 3 is Φ40×3mm, the size of the plastic scintillator 5 is Φ75×75mm, and the front, side and rear ends of the plastic scintillator 5 are respectively covered with 2mg / cm 2 , 1mg / cm 2 and 5mg / cm 2 Thick silver-doped zinc sulfide scintillator 6, photomultiplier tube 8 adopts Beijing Hamamatsu CR105 photomultiplier tube.

[0034] According to the above-mentioned design scheme, a corresponding composite probe is formed (the specific connection relationship is as described above, and will not be repeated here), and the probe is measured by corresponding experiments. 137 Under the Cs source, the measured gamma sensitivity is 2000CPS / (μSv h -1 ), the energy range is 40keV-10MeV, and the dose rate is nSv / h to mSv / ...

Embodiment 2

[0036] In this embodiment, the probe front cover 1 is made of stainless steel, the shielding shell 2 is made of ABS plastic with aluminized outer surface, and the first light guide 4 and the first light guide 7 are made of optical grade silicone oil. The size of the thallium-doped sodium iodide scintillator 3 is Φ75×2mm, the size of the plastic scintillator 5 is Φ90×90mm, and the front, side and rear ends of the plastic scintillator 5 are respectively covered with 3mg / cm 2 , 1.5mg / cm 2 and 6mg / cm 2 The thick silver-doped zinc sulfide scintillator 6 and the photomultiplier tube 8 are PHOTONIS XP5300 photomultiplier tubes.

[0037] According to the above-mentioned design scheme, a corresponding composite probe is formed (the specific connection relationship is as described above, and will not be repeated here), and the probe is measured by corresponding experiments. 137 Under the Cs source, the measured gamma sensitivity is 3000CPS / (μSv h -1 ), the energy range is 30keV-10MeV...

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Abstract

The invention discloses a high-sensitivity wide-range X-gamma ambient dose equivalent rate monitor probe, which consists of a front cover of the probe, a shielding shell, thallium-doped sodium iodide scintillator, a first optical conductor, a plastic scintillator, a silver-doped zinc sulfide scintillator, a second optical conductor, a photomultiplier and a preamplifier circuit which are connectedin turn. By the high sensitivity of the plastic scintillator and the energy compensation of the thallium-doped sodium iodide scintillator and the silver-doped zinc sulfide scintillator, the high-sensitivity wide-range X-gamma ambient dose equivalent rate monitor probe has the advantages of capacity of detecting the ambient dose equivalent rate of X-gamma rays under a wide-range high-dose mixed gamma radiation field, good energy response, high sensitivity and good angular response.

Description

technical field [0001] The invention relates to an X-γ radiation measuring device, in particular to a probe of an X-γ peripheral dose equivalent rate meter. Background technique [0002] Radiation environment and radiation protection are required in environmental monitoring, sanitation and epidemic prevention, non-destructive testing, industrial flaw detection, import and export commodity inspection, radiation medicine, building materials, petrochemical, geological survey, airports, stations, docks, ports, scrap steel, nuclear laboratories, etc. In the case of detection, an environmental-grade dose rate meter is required to measure the dose equivalent rate and absorbed dose rate. The measuring instrument is required to have a good energy response at 30KeV-7MeV (in addition to accurately measuring high-energy γ-rays, it must also be able to accurately measure low-energy X and γ-rays), good dose linearity, good angular response, and high sensitivity. [0003] Existing dose ra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01T1/02G01T1/20
CPCG01T1/023
Inventor 宋建安赵文渊徐强李兆龙尹旺明陈永林
Owner 上海新漫传感科技有限公司
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