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Updated: May 17, 2026

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Multichannel statistical analysis of low-level radioactivity in the presence of background counts
1International Safety Research, Canada. FrancoisLemay@i-s-r.ca
Abstract:
This paper presents a multichannel extension to the Poisson-based Bayesian statistical analysis of the net count rate in a sample. The derivation gives the net count rate probability density distribution in analytical form. In addition, it presents a Normal approximation that is appropriate when the number of counts is large. The new analysis can exhibit a lower false positive probability than methods that consider the counts for each peak separately or sum the counts for all the expected peaks associated with a radioactive substance.
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