Detection system and detection method for measuring beta-ray generated by radioactive gas

Abstract

The invention provides a detection system for measuring beta-ray generated by a radioactive gas. The detection system comprises a detection device and a detection circuit which are connected, wherein the detection device comprises a main detector, and an anticoincidence detector wrapped at the periphery of the main detector; the main detector comprises a box body, at least one first plastic scintillator, a first glass light guide arranged between one first plastic scintillator and one inner wall of the box body, and a first photomultiplier connected between one first glass light guide and the detection circuit; the anticoincidence detector comprises a second plastic scintillator with a hollow middle for accommodating the main detector, and at least one second photomultiplier connected to the second plastic scintillator through a second glass light guide and connected with the detection circuit. According to the detection system disclosed by the invention, the influence of gamma-ray on the measurement result of beta-ray is greatly reduced in a manner of combining the main detector with the anticoincidence detector, thus the detection system is good in convenience on the premise of ensuring the measurement lower limit of the detection system.

Description

technical field [0001] The invention relates to the field of nuclear radiation detection, in particular to a detection system and method for measuring beta rays produced by radioactive gases. Background technique [0002] During the operation of reactors, the production and processing of radioisotopes, the preparation of nuclear fuel, the reprocessing of nuclear fuel, and the treatment and disposal of radioactive waste, 3 H. 41 Ar, 85 Kr and 133 Xe and other radioactive gases. Among these radionuclides, 85 Kr, 133 Xe and its isotopes are the most important fission products produced during the operation of the reactor, and directly reflect the operating status of the reactor; once the loop leaks, these inert gases will quickly diffuse into the air and pollute the surrounding environment. focus of monitoring. [0003] For the monitoring of radioactive gases, due to 85 Kr, 133 Nuclides such as Xe and its isotopes are β emitters or mainly β decay. Therefore, the monitor...

AI Technical Summary

Problems solved by technology

[0005] However, by using a single detector and a thicker lead shield to improve detection accuracy, the entire instrument will be very heavy, which is not conducive to portability

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