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KMID : 0385520130260010086
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Analytical Science & Technology
2013 Volume.26 No. 1 p.86 ~ p.90
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QA/QC for 222Rn analysis in groundwater
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Jeong Do-Hwan
Kim Moon-Su
Kim Hyun-Koo
Kim Hye-Jin
Park Sun-Hwa
Han Jin-Seok
Ju Byoung-Kyu
Jeon Sang-Ho
Kim Tae-Seung
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Abstract
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222Rn concentrations in the groundwater samples without standard material due to the short halflife (3.82 day) were measured through the establishment of the counting efficiency of LSC (Liquid Scintillation Counter) using a standard source of 226Ra. This study for Quality Assurance/Quality Control (QA/QC) of 222Rn analysis was performed to analyze blank samples, duplicate samples, samples of groundwater sampling before and after. In-situ blank samples collected were in the range of 0.44~6.28 pCi/L and laboratory samples were in the range of 1.66~4.95 pCi/L. Their correlation coefficient was 0.9691 and the source contamination from sampling, migration and keeping of samples were not identified. The correlation coefficient between original and duplicate samples from 65 areas was 0.9987. Because radon is an inert gas, in case of groundwater sampling, it is considered to affect the radon concentration. We analyzed samples separately by groundwater sampling before and after using distilled water, but there is no significant difference for 222Rn concentrations in distilled waters of two types.
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KEYWORD
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222Rn, quality assurance/quality control, correlation coefficient, liquid scintillation counting method, standard radioactive source
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