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KMID : 0385520120250020146
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Analytical Science & Technology
2012 Volume.25 No. 2 p.146 ~ p.151
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A study of activity ratios of uranium isotope in the groundwater using liquid scintillation counter
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Cho Soo-Young
Song Kyung-sun
Lee Kil-Yong
Yoon Yoon-Yeol
Kim Won-baek
Ko Kyung-sok
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Abstract
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An analytical method was developed for the measurement of uranium isotope in ground water using the liquid scintillation counting technique. A LKB Wallac Quantulus 1220 liquid scintillation counter (LSC) equipped with pulse shape analyzer (PSA) and a solvent extraction method were used for the measurement of uranium isotope in ground water samples. The effect of solution volume on the extraction efficiency was evaluated for 100 to 1000 mL solutions using a NIST standard reference material (NIST SRM 4321C). The effect of groundwater pH on the extraction efficiency was also investigated for pH ranging from 0.5 to 10. It was found that the extraction efficiency had a strong dependence on pH showing a maximum at pH 2. In contrast, the effect of groundwater volume on the extraction efficiency was negligible in the range investigated.
According to the method, the extraction efficiency of uranium isotopes was near 96% and the lower detection limit for uranium was 0.018 Bq/L with the counting time of 300 min. The result of this study was also verified by the conventional ICP-MS measurement. It is demonstrated that the suggested method is valuable to the determination of the optimum extraction and measurement conditions for uranium in ground water. The method was successfully applied to the ground water at four locations near the Daejeon province. It was found that the uranium content and the isotopic ratio of 234U/238U at the locations ranged 0.59~6.69 Bq/L and 0.72~1.40, respectively.
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KEYWORD
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uranium isotope, liquid scintillation counter, solvent extraction, groundwater,
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