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| Preliminary study on radon sampling method in mine by activated carbon box |
| LIU Chao, XING Yafei, ZHAO Xiao, SONG Zhiwei, CHEN Yu, ZHANG Yanwei |
| Institute of Industrial Hygiene of Ordnance, Xi’an 710065 China |
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Abstract Objective In this paper, the influence of factors such as adding filter membrane on the adsorption surface of the carbon box and changing the direction of the adsorption surface in the radon sampling process of the activated carbon box method on the measurement results was studied. It provides technical support for the application of this method to the detection of radon concentration in high humidity and high dust environments in mines.Methods Arranged the activated carbon box according to the experimental scheme. After the adsorption time, put on a sealed lid and weighed it. After 5 hours, used the HD-2001 low background gamma spectrometer to test the radon concentration. In order to compare the measurement results, RAD7 radon concentration detector was used to measure the radon concentration in the test room synchronously.Results Radon concentrations in the air measured with the adsorption surface of the activated carbon box up or down were (227.2 ±3.0) Bq/m3 and (229.8 ±3.7) Bq/m3 respectively. The relative deviation of the measurement results of the two placement methods was only 1.1%. The radon concentrations in the air were (224.3 ±3.0) Bq/m3 and (231.8 ±3.0) Bq/m3 respectively after quantitative filter paper or Hi-Q dust accumulation filter membrane added on the adsorption surface of the activated carbon box. The relative deviation between the measured results with and those without filter membrane were -1.3% and 2.0%, respectively. At 89.5% ambient humidity, the radon concentrations in the air measured by the active carbon box were between 221.5 Bq/m3 and 238.1 Bq/m3. Under the same condition, the radon concentration measured by the RAD-7 instrument was 243 Bq/m3, and the relative deviation between the two methods was only -6.1%.Conclusion Under this test condition, a quantitative filter paper or hi-q dust filter membrane was added to the adsorption surface of the activated carbon box during sampling, and the adsorption surface of the activated carbon box was placed downward, which had no significant effect on the measurement results. This sampling method can avoid the dust, slag and other impurities in the mine falling into the activated carbon box and affecting the measurement results.
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Received: 24 May 2020
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