Validation of a loss-free counting system for neutron activation analysis with short-lived indicators |
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Authors: | K Heydorn E Damsgaard |
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Institution: | (1) Isotope Division, Risø National laboratory, DK-4000 Roskilde, Denmark |
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Abstract: | The use of loss-free counting systems makes possible the exact correction for pile-up and dead-time losses during counting of a mixture of short-lived radionuclides even at very high count rates. However, counting statistics cannot be calculated by taking into account only the Poisson distribution of the incoming -quanta, such as is done in existing computer programs for -spectrometry. At moderate count rates Müller statistic was found to account for the observed variability between duplicate countings; however, at higher count rates the variability of weighing factors was found to be significant in comparison with the Müller statistic. While counting statistics could not be correctly estimated for short-lived species, experiments showed excellent accuracy for initial dead times up to 90%. |
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