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Stack anti-coincidence detector for measuring 85Kr

A detector and stack technology, applied in the field of stacked anti-coincidence detectors, can solve problems such as lowering the detection limit, and achieve the effect of lowering the background level, small size and compact structure

Active Publication Date: 2019-06-21
INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

"A Measurement 85 Kr's Inner Gas Detector" (ZL201710548485.1) proposes a β energy spectroscopy method based on inner gas scintillator detection technology, which simplifies the gas separation process and significantly reduces 85 The lower limit of detection of Kr, but at 85 When the concentration of Kr is lower or the amount of available sample is small, only the development of measurement techniques with higher detection efficiency and lower background level can meet the monitoring needs

Method used

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  • Stack anti-coincidence detector for measuring 85Kr
  • Stack anti-coincidence detector for measuring 85Kr
  • Stack anti-coincidence detector for measuring 85Kr

Examples

Experimental program
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Embodiment 1

[0028]The sample interface 1 of this embodiment adopts a standard size 1 / 8 inch tube, and the valve 2 installed on it is used to control the entry and exit of the gas sample to be tested and the cleaning of the detector sample pool 12; the stainless steel shell 8 wraps The periphery of the entire detector plays a role of support and protection; the interface of the sample 1 passes through the stainless steel casing 8 and is connected to the top cover 3 of the measuring scintillator, and is welded on the detector casing 8 through the fixed boss 6, and the joint is glued agent seal to ensure the airtightness of the sample cell 12; the measuring scintillator cup body 5 is combined with the measuring scintillator top cover 3 through the connecting thread 7 to form a well-sealed measuring scintillator container, and the hollow part of the container is used for storing the scintillator to be tested 85 The sample cell 12 of Kr also needs to smear adhesive to ensure tightness at the sa...

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Abstract

The invention discloses a stack anti-coincidence detector for measuring 85Kr. The principle of inner gas-filled scintillator detector is used. The detection solid angle of nearly 4pi is obtained by improving the structure of the measurement scintillator. Meanwhile, the anti-coincidence detector is introduced through the stack composite structure so that the measurement background level can be significantly reduced and the detection capability of 85Kr can be improved without increasing the volume of the detector. The detector has the advantages of compact structure, small size, high detection efficiency, low background level and good firmness and is insensitive to the composition change of the inflated gas sample and does not need to use liquid nitrogen to transfer the sample so that the detector can be widely applied to monitoring of the small size and low concentration 85Kr in the air-borne effluent of nuclear power plants and spent fuel post-processing plants.

Description

technical field [0001] The invention belongs to radioactive 85 Kr measurement technical field, be specifically related to a kind of measurement 85 Stacked anticoincidence detector for Kr. Background technique [0002] 85 Kr is the inert gas fragment with the longest half-life produced by nuclear fission reaction. It is chemically stable and easily enters the environment in the form of atoms. Under normal operating conditions, nuclear power plants produce 85 Kr will be sealed in the fuel assembly in the form of gas, very few leaks, most 85 Kr is released during the cutting and acid dissolution of spent fuel reprocessing. 85 The concentration level of Kr is an important data indicating the operational safety and radiation safety of nuclear facilities. According to the relevant national standards (GB 11217-1989, GB 6249-2011), nuclear power plants and spent fuel reprocessing plants need to conduct regular or continuous monitoring of airborne effluents. 85 Kr content is me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/203
CPCY02E30/30
Inventor 曾军向永春罗飞迮仁德王红侠郝樊华向清沛
Owner INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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