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Device and method for measuring effective diffusion coefficient of radon in thin film

A technology of diffusion coefficient and measuring device, applied in the field of nuclear radiation detection, can solve problems such as long time, and achieve the effects of high radon concentration, simple structure, accurate and effective diffusion coefficient

Active Publication Date: 2019-01-29
HENGYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing measurement method only measures the effective diffusion coefficient of radon in the film through a film, and the measurement process takes a long time

Method used

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  • Device and method for measuring effective diffusion coefficient of radon in thin film
  • Device and method for measuring effective diffusion coefficient of radon in thin film
  • Device and method for measuring effective diffusion coefficient of radon in thin film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Embodiment 1. A device for measuring the effective diffusion coefficient of radon in a thin film, including a measuring chamber 1 , a radon measuring instrument 2 , a pump 3 and an annular sealing gasket 4 .

[0061] The measuring chamber 1 includes a threaded cylindrical cylinder 1-1 at both ends and threaded end caps 1-2 connected to the two ends of the cylindrical cylinder 1-1, on the wall of the cylindrical cylinder 1-1 The air outlet joint 1-1-1 and the air intake joint 1-1-2 are symmetrically arranged, the inner diameter of the cylindrical cylinder 1-1 is D1, and the threaded end cap 1-2 is provided with an annular groove 1-2- 1. An annular sealing gasket 4 is installed in the annular groove 1-2-1, and the hole diameter on the end cover plate of the threaded end cover 1-2 is D2, where D1=D2.

[0062] The gas outlet joint 1-1-1 on the measurement chamber 1 is connected to the gas inlet of the radon meter 2 through a pipeline, the gas outlet of the radon meter 2 is ...

Embodiment 2

[0088] Embodiment 2, compared with Embodiment 1, the difference is: on the cylinder wall of the cylindrical cylinder 1-1, four cylindrical measuring chambers 6 are added, and the cylindrical measuring chamber 6 is connected with the cylindrical cylinder 1-1. The inner cavity of 1 is connected, and the inner diameter of the cylindrical measuring cavity 6 is the same as that of the cylindrical barrel 1-1. The structure of the end of the cylinder body 1-1 is the same as that of the threaded end cap 1-2 connected with the cylindrical cylinder body 1-1.

[0089] The method of measuring the effective diffusion coefficient of radon in the film by using the above-mentioned measuring device through six films is as follows, which includes the measurement process and the calculation process:

[0090] 1. Measurement process:

[0091] A. Cut the film to be measured into a circular film sheet 5 with the same diameter as the outer diameter of the port of the cylindrical cylinder 1-1, and at...

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Abstract

The invention relates to a device and a method for measuring an effective diffusion coefficient of radon in a thin film. The device comprises a measuring chamber, an emanometer, a pump and an annularsealing gasket. The measuring chamber comprises a cylindrical barrel and a threaded end cover connected to the two ends of the cylindrical barrel, wherein the cylinder wall of the cylindrical barrel is provided with an air outlet end connector and an air inlet end connector; the annular sealing gasket is arranged in an annular groove of the threaded end cover; the air outlet end connector on the measuring chamber is connected to the air inlet end of the emanometer; the air outlet end of the emanometer is connected to the air inlet end of the pump; and the air outlet end of the pump is connected to the air inlet end connector of the measuring chamber. The method comprises a measurement process and a calculation process; a thin film material needing to be measured is cut into circular sheetswith the same diameter as the outer diameter of a port of the cylindrical barrel during measurement, the circular sheets are respectively attached to the two ends of the cylindrical barrel and are compressed an sealed by the threaded end cover; the cylindrical measuring chamber is placed in a standard radon chamber, the change trend of the radon concentration in the cylindrical barrel is measured, and the effective diffusion coefficient of the radon in the thin film is obtained through a calculation method after measurement.

Description

technical field [0001] The invention relates to the technical field of nuclear radiation detection, in particular to a device and method for measuring the effective diffusion coefficient of radon in a thin film. Background technique [0002] Radon is a radioactive inert gas harmful to the human body. Radon in the air environment mainly comes from the precipitation on the surface of the medium. Due to mine radiation protection and indoor radon pollution, it is necessary to use a dense film to prevent radon from entering the working and living environment. The effective diffusion coefficient of radon in the film can be used to evaluate the barrier performance of the film to radon. The existing method for measuring the effective diffusion coefficient of radon in the film is generally to use a film to divide the inner cavity of the measurement chamber into two measurement chambers, wherein One measurement cavity injects high concentration radon, and the high concentration radon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/00G01T1/167
CPCG01N13/00G01N2013/003G01T1/167
Inventor 袁红志谭延亮
Owner HENGYANG NORMAL UNIV
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