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Article Dans Une Revue Applied Radiation and Isotopes Année : 2023

Uncertainties in TDCR measurement revisited: contribution of optical effects

Résumé

In the Triple to Double Coincidence Ratio method in Liquid Scintillation Counting, the detection efficiency is calculated from the value of a free parameter describing the intrinsic light yield of the counting system. This model is generally based on a Poisson distribution of the number of photoelectrons detected and the detection efficiency is obtained from the complement of the non-detection efficiency. In the classical free parameter model, the mean of the Poisson distribution, m, is a constant but some variability of this mean could be expected from optical effects due to internal reflections inside the LS source or from non-homogeneity of the detection efficiency of the photomultiplier tubes. Then, m becomes a random variable and the distribution of the photoelectrons becomes a compound Poisson distribution, with a random variable as mean value. This paper explores the implications of the variance of m, which were, to our knowledge, never considered previously in the uncertainty budget of TDCR measurements.
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Dates et versions

cea-04191073 , version 1 (30-08-2023)

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Philippe Cassette, Vladislav Todorov, Benoit Sabot, Krasimir Mitev, Strahil Georgiev. Uncertainties in TDCR measurement revisited: contribution of optical effects. Applied Radiation and Isotopes, 2023, 201, pp.110992. ⟨10.1016/j.apradiso.2023.110992⟩. ⟨cea-04191073⟩
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