Radioactive xenon beta-gamma coincidence detector based on laminated scintillator

A stacked scintillator and detector technology, which is applied in radiation measurement, nuclear radiation exploration, radiation intensity measurement, etc., can solve the problems of bulky, low-energy gamma signal loss, complex structure, etc., and achieve probe structure and electronics Simple modules, easy operation and maintenance, and good energy resolution

Pending Publication Date: 2020-05-22
INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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Problems solved by technology

But CsI(Tl) crystals contain trace amounts of 137 Cs is not conducive to the measurement of extremely low radioactivity, and the output signal amplitude is low, which may easily lead to the loss of low-energy γ signals
The NaI(Tl) crystal has the advantages of good energy resolution, low radioactive background, and high si...

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  • Radioactive xenon beta-gamma coincidence detector based on laminated scintillator

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Embodiment 1

[0035] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with each specific embodiment.

[0036] In this implementation example:

[0037] The ampoule-shaped plastic scintillator 12 adopts the plastic scintillator BC404 of Saint-Gobain Company, which is machined to a wall thickness of 1.5mm, an outer diameter of the bottom of 25mm, a height of 25mm, an outer diameter of the neck of 6mm, and a height of 27mm.

[0038] The well-type inorganic scintillator 13 adopts NaI(Tl) crystal, the outer diameter is 76mm, the depth of the well part is 50mm, and the inner diameter is 50mm.

[0039] The NaI(Tl) scintillator block 10 adopts NaI(Tl) crystals, with an outer diameter of 50 mm, an inner diameter of 6 mm, and a height of 50 mm.

[0040] The volume of the radioactive xenon sample chamber 11 is 8.4mL, and the junction with the valve 2 and the gas pipeline II4 ...

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Abstract

The invention provides a radioactive xenon beta-gamma coincidence detector based on a laminated scintillator. According to the detector, a single photomultiplier is adopted to read the scintillation light of each scintillator, the beta-gamma coincidence measurement is realized based on the pulse waveform analysis, so that the great simplification of a traditional beta-gamma coincidence detector structure and the matched readout electronics is realized. Besides, the detector adopting the NaI (T1) and plastic scintillator cavity structure design is of a full-surrounding detection structure, thescintillators of all layers are proper in size, and the detector has the advantages of being high in detection efficiency and low in cost. The detector can be applied to the fields of the extremely important tracer nuclide and nuclear explosion event monitoring and the nuclear reactor operation safety monitoring in environmental effluent monitoring, the nuclear accident leakage level evaluation, etc., and can also be applied to the radioactivity monitoring of a leaked gas in the processes of medical isotope production, spent fuel storage places, nuclear material aftertreatment and the like.

Description

technical field [0001] The invention relates to the field of environmental effluent monitoring, in particular to a radioactive xenon β-γ coincidence detector based on laminated scintillators. Background technique [0002] Xenon is a chemically stable inert gas nuclide. The radioactive xenon in the natural environment mainly comes from nuclear explosions, nuclear medicine production, and nuclear material fission reactions during the operation of nuclear power plants. It is an extremely important tracer nuclide in environmental effluent monitoring. , is widely used in nuclear explosion event monitoring, nuclear reactor operation safety monitoring and nuclear accident leakage level evaluation. At present, the measurement of radioactive xenon generally adopts high-purity germanium gamma spectrometer and traditional β-γ coincidence detector. The structure of the probe is complex, expensive, and the operation and maintenance costs are high. At the same time, it is bulky and only s...

Claims

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Application Information

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IPC IPC(8): G01T1/208G01T1/20G01V5/00
CPCG01T1/208G01T1/2008G01V5/00
Inventor 罗飞向永春王茜迮仁德龚建郝樊华曾军胡根向清沛胡广春张昌繁储诚胜
Owner INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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