What is it about?
There are lots of anomalies in 40K measurement in natural samples, which result incorrect estimation. This problem has been addressed in this paper.
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This page is a summary of: Anomalies in quantitative measurement of 40K in natural samples, Journal of Radioanalytical and Nuclear Chemistry, March 2018, Springer Science + Business Media, DOI: 10.1007/s10967-018-5777-5.
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