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Device and method for measuring radon in scintillation chamber

A technology of scintillation chamber and radon concentration, which is applied in the field of nuclear radiation detection, can solve the problems of low total count rate, small detection sensitive volume, and large statistical fluctuation of measurement results, so as to reduce statistical fluctuation, improve detection sensitivity, and increase count rate effect

Active Publication Date: 2019-04-19
HENGYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently used scintillation chamber for measuring radon is affected by the structure of the photomultiplier tube, which makes its detection sensitive volume smaller, the total count rate during measurement is low, and the statistical fluctuation of measurement results is large.

Method used

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  • Device and method for measuring radon in scintillation chamber
  • Device and method for measuring radon in scintillation chamber
  • Device and method for measuring radon in scintillation chamber

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Embodiment 1

[0041] Such as Figure 1-6 As shown, a scintillation chamber radon measuring device comprises a wavelength-shifted optical fiber 1, a plurality of single-layer scintillation chambers 2, an electronic readout system, and a photomultiplier tube or a silicon photomultiplier (an electronic readout system, a photomultiplier tube, and a silicon photomultiplier The silicon photomultiplier is prior art and its structure is not shown in the accompanying drawings).

[0042] All single-layer scintillation chambers 2 include cylindrical and light-tight housings 2a, the housings 2a of the aforementioned multiple single-layer scintillation chambers 2 are stacked and connected together from bottom to top, and the bottom ends of all housings 2a are An end cover 2a1 is provided, and a top cover 2a2 is provided on the top of the shell 2a of the single-layer scintillation chamber 2 located on the uppermost layer. Air holes 2b are opened on the top cover 2a2 and all end covers 2a1. The top cover ...

Embodiment 2

[0052] See Figure 7-12 As shown, the difference between this embodiment and Embodiment 1 is mainly that the number of wavelength-shifted optical fibers 1 is multiple. Correspondingly, a separate wavelength-shifting fiber 1 is used to collect the flash generated by alpha particles hitting the scintillation crystal on its inner wall, and the ends of all wavelength-shifting fibers 1 are connected to photomultiplier tubes or silicon photomultipliers. In addition, it also includes a central shaft 4 for positioning and installing the wavelength shifting optical fiber 1, the central shaft 4 passes through the end caps 2a1 of other housings 2a upwards from the inner cavity of the bottom shell 2a and passes through the top cover 2a2 Going out from the top, the central shaft 4 is coaxially arranged with the housing 2a, and a plurality of positioning grooves are arranged on the outer peripheral surface of the central shaft 4 along its axial direction in parallel intervals, and the wavel...

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Abstract

The invention discloses a device and method for detecting radon in a scintillation chamber, and relates to the technical field of nuclear radiation detection. The device for measuring radon in the scintillation chamber comprises a plurality of single-layer scintillation chamber bodies, wherein each single-layer scintillation chamber comprises a shell; the shells are connected together in a stackedmanner from bottom to top, and partition plates are arranged in the cavity of each shell; the corresponding partition plates divide the cavity of each shell into a plurality of sector chambers, and the inner wall surfaces of the sector chambers are coated with scintillation crystals; the distance between any two points in each sector chamber is less than the range of alpha particles produced by 222Rn decay; all the sector chambers communicate with one another in sequence, and a wavelength displacement optical fiber penetrates through the cavity of each shell; the tail ends of the wavelength displacement fibers are connected to a photomultiplier tube or a silicon photomultiplier; the photomultiplier tube or silicon photomultiplier is connected to an electronic readout system; and the wavelength-shifted fibers are used to collect flicker produced by the impact of the alpha particles on the scintillation crystals on the inner walls of the sector chambers. The concentration of the radon can be determined from the relationship between alpha particle counting and the concentration of the radon, which is identified and recorded by the electronic readout system.

Description

technical field [0001] The invention relates to the technical field of nuclear radiation detection, in particular to a device and method for measuring radon in a scintillation chamber. Background technique [0002] Radon is a radioactive gas, and radon daughters are radioactive aerosols. The radiation produced by inhalation of human body can induce lung cancer. According to UNSCEAR's 2000 report, the annual effective dose of radon and its progeny accounts for 54.2% of the adult annual effective dose of 2.4mSv caused by natural ionizing radiation sources. Therefore, the research on radon has always been an important topic in radiation protection and environmental protection. With the development of science and technology, there are many new methods and instruments for measuring radon concentration. According to the measurement methods, they are divided into: ionization chamber method, scintillation chamber method, electrostatic collection alpha energy spectroscopy method, do...

Claims

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Application Information

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IPC IPC(8): G01T1/20G01T1/167
CPCG01T1/167G01T1/2006
Inventor 李志强
Owner HENGYANG NORMAL UNIV
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