• Nuclear Engineering and Technology
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• v.31 no.5
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• pp.445-454
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• 1999

This work describes the adaptation of extractive scintillation by URAE $X^{TM}$ with a photon-electron rejecting alpha liquid scintillation (PERAL $S^{)}$ spectrometer to the analysis of uranium in aqueous samples. The extraction efficiency of the system was evaluated under varing chemical conditions including pH, and sample-cocktail volume ratio. Isotopic information from the (PERAL $S^{)}$ spectrum of natural uranium was obtained using a curve fitting routine. Comparisons of the result with that obtained from alpha spectrometry method using ion implanted silicon detector showed good agreement.t.

• Journal of Radiation Protection and Research
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• v.20 no.4
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• pp.275-283
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• 1995

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.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2005.10a
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• pp.252-253
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• 2005

• Proceedings of the Korean Nuclear Society Conference
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• 1999.05a
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• pp.354-354
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• 1999

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2005.04a
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• pp.359-362
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• 2005

알파전용 액체섬광기를 이용하여 지하수내 Polonium을 간편하고 신속하게 측정하는 방법을 연구하였다. 추출섬광용액으로 HDEHP, TNOA, TOPO 또는 NDA 등을 사용하지만 본 실험에서는 POREX(77g TOPO, 180g Naphthalene, 4.0g PBBO/1L Toluene)를 사용하였다. 지하수의 액상을 $1M\;H_2SO_4-0.01M\;NaCl$로 맞추어주고 0.012M POREX를 추출액으로 사용하여, 분리 추출하므로써 실험의 추출효율 및 재현성을 조사하였다. 위 조건에서의 Polonium 분배계수는 $10^4$ 이상으로 알려져 있다. 표준물질인 Po-209(NIST SRM 4326)를 Po의 측정효율 및 추출효율을 조사하는데 이용하였다. 실제 지하수에 위 실험방법을 적용하여 지하수의 Polonium을 측정하였다.