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J Radiat Prot > Volume 20(4);1995 > Article
Journal of Radiation Protection 1995;20(4):275.
액체섬광계수기에 의한 지하수중의 $^{222}Rn$$^{226}Ra$ 분석법 연구
A Study of $^{222}Rn;and;^{226}Ra$ Analysis in the Groundwater by LSC
Woo, Hyung-Joo;Yoon, Yoon-Yeol;Cho, Soo-Young;Chun, Sang-Ki;
PERALS(Photon Electron Rejecting Alpha Liquid Scintillation) spectrometry coupled with solvent extraction method has been set up for the analysis of $^{222}Rn;and;^{226}Ra$ in the groundwater. This analytical method offers low background, better energy resolution and lower quenching problem than the other techniques. By the analysis of NIST SRM 4966 $^{226}Ra$ standard, the analytical accuracy and precision were found to be 3% and 1%, respectively, and the relative standard deviation of the recovery of Rn extraction between pH2 and pH10 was 7%. Detection limits of $^{222}Rn$ and $^{226}Ra$ for 10 hours counting were counted to be $0.42 pCi/{iota};and;0.016 pCi/{iota}$, respectively. For the test analysis of $^{222}Rn;and;^{226}Ra$ in the graundwater, hot spring water samples of 17 regions were analyzed. The concentration of $^{222}Rn$ were in the range of $90{sim}5200pCi/{iota}$ and average value was $1470pCi/{iota};^{226}Ra$ concentration showed a peak value of $97.9pCi/{iota}$ in a Kangwon region, but the average value was $1.14pCi/{iota}$ except that region.
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