Determination of ²³⁸U in ground-water samples using gamma-ray spectrometry

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• 作者：M. Korun ; ^a ; ^{matjaz.korun@ijs.si} ; K. Kovač ; ič ; ^a
• 关键词：Gamma-ray spectrometry ; Water samples ; Decision threshold ; ²³⁸U ; ²³⁴Th
• 刊名：Applied Radiation and Isotopes
• 出版年：2011
• 出版时间：March 2011
• 年：2011
• 卷：69
• 期：3
• 页码：636-640
• 全文大小：252 K

文摘

A method for measuring the low activity concentration of ²³⁸U in water is described. Samples of 50 L were evaporated and the dry residue after evaporation was measured. Typically, 30 g of material was obtained for the samples processed in this way. Based on measuring the samples using a gamma-ray spectrometer, equipped with a germanium crystal having a diameter of 8 cm and a beryllium window, the decision threshold resulting from the measurements was assessed to be 1.5 Bq/m³. A total of 26 samples of ground water were processed and activity concentrations of up to 20 Bq/m³ were measured. However, most of the results were in a range around 5 Bq/m³.