Journal
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
Volume 291, Issue 1, Pages 175-178Publisher
SPRINGER
DOI: 10.1007/s10967-011-1273-x
Keywords
Non-destructive activation analysis; High-resolution a spectrometry; U-238 determination; U-234/U-238 relationship; Geological samples
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A method that combines the use of non-destructive neutron activation analysis and high-resolution alpha spectrometry has been developed for determination of the activities of U-234 and U-238 in geological samples of low uranium content. The U-238 content is determined by k(0)-based neutron activation analysis, whereas the U-234/U-238 relationship is measured by alpha spectrometry after isolation and electrodeposition of the uranium extracted from a lixiviation with 6 M HCl. The main advantage of the method is the simplicity of the chemical operations, including the fact that the steps destined to assure similar chemical state for the tracer and the uranium species present in the sample are not necessary. The method was applied to soil samples from sites of the North Peru Coast. Uranium concentration range 3-40 mg/kg and the isotopic composition correspond to natural uranium, with about 10% uncertainty.
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