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KMID : 0385520150280050353
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Analytical Science & Technology
2015 Volume.28 No. 5 p.353 ~ p.360
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Study on 222Rn reduction rate in boiling groundwater
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Kim Moon-Su
Kim Hyun-Koo
Park Sun-Hwa
Kim Hyoung-Seop
Ju Byoung-Kyu
Kim Dong-Su
Cho Sung-Jin
Yang Jae-Ha
Kwon Oh-Sang
Kim Tae-Seung
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Abstract
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Boiling is an efficient removal method to reduce radon in groundwater when ventilating indoor air. 13 groundwater samples with various radon concentrations were used to evaluate the reduction rate of radon with heating temperature and time. The groundwater samples were obtained by Bladder pump and on-situ measurements such as dissolved oxygen (DO) and hydrogen concentration (pH) and so on were carried out by a flow cell system isolated from the ambient atmosphere environment. All samples for measuring radon in groundwater were analyzed by liquid scintillation counter (LSC). The experiment result showed that increasing groundwater temperature enhanced radon removal rate but the initial radon concentration with high level lowered the removal rate. This means that radon reduction in groundwater by heating needs more heating energy and longer heating time with radon concentrations. Radon removal rate in groundwater, therefore, mainly depends on the initial radon concentration, heating temperature, and heating time.
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KEYWORD
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Radon, Liquid scintillation counter, heating, radon removal rate,
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