Gamma-beta composite detection device

A compound detection and gamma-ray technology, which is applied in measuring devices, X/γ/cosmic radiation measurement, radiation measurement, etc., can solve the problems of long half-life, gamma-ray detection energy characteristic peak, short half-life, etc.

Pending Publication Date: 2020-10-23
CHINA NUCLEAR POWER OPERATION TECH +1
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Problems solved by technology

The gamma-ray decay branch ratio of Xe-133 is large, and the detection of gamma-rays can find obvious energy characteristic peaks, thereby determining Xe-133 and its radioactivity. However, due to the short half-life, it is difficult to measure Xe for fuel assemblies that have been out of the stack for a long time -133 nuclides to determine damage
Kr-85 has a long half-life, which can be used as a basis

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Embodiment Construction

[0029] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] Generally speaking, for fuel assemblies with a short stacking time, the Xe-133 gas content is relatively large, and the energy characteristic peak of Xe-133 can be found by detecting gamma rays to analyze its radioactivity.

[0031] The nuclides released from damaged fuel assemblies mainly include: Xe-133, Kr-85, I-131, Cs-136, Cs-134, Cs-137 and isotopes of Xe and Kr, and most of the other nuclides are medium and short Lifespan: Most of the nuclides have decayed within about a week after leaving the pile. The isotope half-life of Xe and Kr nuclides is generally too short. Nuclear fuel assemblies basically do not exist in the components two months after leaving the pile. The half-life of I-131 is 8.02d , Cs-134 half-life is 752.63d, and Cs-137 half-life is 11013d, but the above nuclides are isotopes that are easily soluble in w...

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Abstract

The invention belongs to the technical field of nuclear power maintenance, and particularly relates to a gamma-beta composite detection device. The absorptivity of the first scintillation crystal to beta rays is higher than that to gamma rays so that a first photomultiplier and a first signal processing unit can detect beta rays according to light emitted by the first scintillation crystal; the absorptivity of the second scintillation crystal to beta rays is lower than that of the second scintillation crystal to gamma rays so that a second photomultiplier and a second signal processing unit can detect the gamma rays according to light emitted by the second scintillation crystal, composite detection of the gamma rays and the beta rays is realized, and the damage condition of the fuel assembly at different pile-out time can be judged in an auxiliary manner. Besides, the first scintillation crystal is used as a detection chamber so that the gas to be detected is effectively stored, and the first scintillation crystal can be irradiated by rays released by the gas to be detected more fully from inside to outside, and therefore, the gamma-beta composite detection device can detect beta rays released by the gas to be detected more sensitively.

Description

technical field [0001] The invention belongs to the technical field of nuclear power maintenance, and in particular relates to a γ-β composite detection device. Background technique [0002] The most efficient way to detect nuclear fuel assembly damage is to detect the radioactive fission gas released to the outside. The fissile substances in the fuel assembly mainly include Xe-133, Kr-85, I-131, Cs-136, Cs-134, CS -137 and the isotopes of these elements, among which the gaseous fission products that are not easily soluble in water are mainly Xe-133 and Kr-85 and their isotopes. The gamma-ray decay branch ratio of Xe-133 is large, and the detection of gamma-rays can find obvious energy characteristic peaks, so as to determine Xe-133 and its radioactivity. -133 nuclide to determine the damage. Kr-85 has a long half-life, which can be used as a basis for judging the damage of fuel assemblies for a long time out of the stack. However, the γ-decay branch ratio of Kr-85 is smal...

Claims

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Application Information

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IPC IPC(8): G01T1/20G01T1/202G01T1/203G01T1/36G01T1/38
CPCG01T1/2008G01T1/2023G01T1/203G01T1/362G01T1/38
Inventor 龚雪琼周政郝庆军廖昌斌
Owner CHINA NUCLEAR POWER OPERATION TECH
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