Method for measuring precipitation rate of radon

A radon extraction rate and measuring room technology, which is applied in the field of nuclear radiation detection, can solve the problems of low radon extraction rate, etc., and achieve the effects of improving reliability, reducing cost and accurate radon extraction rate.

Inactive Publication Date: 2009-12-23
HENGYANG NORMAL UNIV
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Problems solved by technology

Since the radon concentration has been rising during the rapid measurement of the radon concentration, it is impossible for radon and its decay progeny polonium 218 to reach a balance. Therefore, the radon exhalation rate obtained by the existing calculation method is also low

Method used

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  • Method for measuring precipitation rate of radon
  • Method for measuring precipitation rate of radon
  • Method for measuring precipitation rate of radon

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Embodiment

[0045] Embodiment: a method for measuring radon exhalation rate, which includes a measurement process and a calculation process.

[0046] 1. Measurement process:

[0047] like figure 1 , figure 2 As shown, buckle the radon hood 5 on the surface of the medium to be measured, or put the medium into the collection chamber of the radon hood, wherein figure 1 It is a schematic diagram of the measurement process of the surface of the medium, figure 2 It is a schematic diagram of the measurement process of particulate matter 8 or massive 7 substances. Because radon atoms in the medium escape from the surface and enter the collection chamber of the radon hood 5 under the action of diffusion and seepage, the radon concentration in the collection chamber of the radon hood 5 changes. Pump 6 is pumped into measurement chamber 2 after the radon in the collection chamber of radon hood 5 is filtered through drying pipe 4 and filter membrane 3 at a constant flow rate, and the flow rate ...

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Abstract

The invention relates to a method for measuring the precipitation rate of radon, which comprises a measuring step and a calculating step. A radon collection cover is covered on the surface of a medium to be tested or the medium is put in the radon collection cover, a group of radon concentration data is obtained after measuring at time intervals, and the radon concentration data obtained by measure are fitted in a nonlinear way to obtain the precipitation rate of radon according to a formula (9); or measure data after 20 min are fitted in a nonlinear way to obtain the precipitation rate of radon according to a formula (10).

Description

technical field [0001] The invention relates to a nuclear radiation detection technology, in particular to a method for measuring radon exhalation rate. Background technique [0002] Radon in the air environment mainly comes from the precipitation on the surface of the medium. The main methods for measuring the precipitation rate of radon on the surface of the medium are the accumulation method and the activated carbon adsorption method. The activated carbon adsorption method is to use activated carbon to adsorb the precipitated radon, and obtain the radon precipitation rate by measuring the γ spectrum generated by the decay of radon adsorbed in the activated carbon. This method takes a long time to measure and is not easy to automate; the accumulation method is mainly used for measuring The average radon exhalation rate over a period of time has important statistical significance and reference value. The electrostatic collection type radon exhalation rate meter using the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/167
Inventor 谭延亮肖田周毅
Owner HENGYANG NORMAL UNIV
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