Abstract
For the net count calculation method, decision thresholds of net numbers of counts are underestimated if the gross numbers of counts are below numbers of detector background counts. A priori knowledge of non-negative radioactivity was used to estimate interferences and the memory effect. The baselines of decision thresholds are estimated by the spectrum of a hypothetical sample in which net numbers of counts were all equal to zero. No decision thresholds for low count samples are below the baselines.
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