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Published on: February 1, 2016
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Consistency test of coincidence-summing calculation methods for extended sources
O Sima1, A De Vismes Ott2, M S Dias3
1Physics Department, University of Bucharest, Bucharest-Magurele, Romania; Horia Hulubei National Institute for R & D in Physics and Nuclear Engineering (IFIN-HH), Bucharest-Magurele, Romania.
Summary
A new internal consistency test validates coincidence-summing correction factors (FC) for volume sources. The test identified inaccuracies in the quasi-point source approximation, revealing its bias.
Area of Science:
- Nuclear physics
- Radiochemistry
- Metrology
Background:
- Accurate calculation of coincidence-summing correction factors (FC) is crucial for quantitative gamma-ray spectrometry of volume sources.
- Existing methods may introduce biases, particularly when approximating complex geometries.
Purpose of the Study:
- To present a novel internal consistency test for coincidence-summing correction factors (FC) for volume sources.
- To evaluate the reliability of FC calculations submitted by different research teams.
- To assess the validity of the quasi-point source approximation in FC calculations.
Main Methods:
- Development of an internal consistency test based on exact equations relating FC values from three ideal measurement configurations.
- Application of the test to 33 sets of FC values from 21 international teams.
- Qualitative analysis of bias in FC values derived from the quasi-point source approximation.
Main Results:
- Most submitted FC calculation sets passed the internal consistency test.
- FC values obtained using the quasi-point source approximation consistently failed the test.
- The test successfully indicated the magnitude and direction of bias introduced by the quasi-point source approximation.
Conclusions:
- The presented internal consistency test is a reliable method for verifying FC calculations for volume sources.
- The quasi-point source approximation introduces significant bias in FC calculations and should be used with caution.
- This work contributes to improving the accuracy and reliability of radioactivity measurements.
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