Radioactive xenon beta-gamma coincidence detector based on laminated scintillator

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...

AI Technical Summary

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 signal amplitude, but it is extremely difficult to machine, and there is no NaI(Tl)-based stacked β-γ coincidence detector for use.

[0004] In view of the defects of the existing radioactive xenon detectors such as complex structure, high price and large volume, it is urgent to develop a new radioactive xenon β-γ coincidence detector

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