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http://dx.doi.org/10.5806/AST.2013.26.1.086

QA/QC for 222Rn analysis in groundwater  

Jeong, Do Hwan (National Institute of Environmental Research)
Kim, Moon Su (National Institute of Environmental Research)
Kim, Hyun Koo (National Institute of Environmental Research)
Kim, Hye Jin (National Institute of Environmental Research)
Park, Sun Hwa (National Institute of Environmental Research)
Han, Jin Seok (National Institute of Environmental Research)
Ju, Byoung Kyu (National Institute of Environmental Research)
Jeon, Sang Ho (National Institute of Environmental Research)
Kim, Tae Seung (National Institute of Environmental Research)
Publication Information
Analytical Science and Technology / v.26, no.1, 2013 , pp. 86-90 More about this Journal
Abstract
$^{222}Rn$ concentrations in the groundwater samples without standard material due to the short half-life (3.82 day) were measured through the establishment of the counting efficiency of LSC (Liquid Scintillation Counter) using a standard source of $^{226}Ra$. This study for Quality Assurance/Quality Control (QA/QC) of $^{222}Rn$ 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 $^{222}Rn$ concentrations in distilled waters of two types.
Keywords
$^{222}Rn$; quality assurance/quality control; correlation coefficient; liquid scintillation counting method; standard radioactive source;
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