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Uncertainties in calculated correction factors for true coincidence-summing (TCS)
J Kastlander1, L-E De Geer2, S Jonsson3
1Swedish Defence Research Agency (FOI), Division of CBRN Defence and Security, SE-164 90 Stockholm, Sweden.
Summary
This study quantifies uncertainties in Monte Carlo calculated true coincidence summing (TCS) correction factors for 134Cs. The findings indicate minimal impact on overall activity measurement uncertainty for applications like environmental monitoring.
Area of Science:
- Nuclear physics
- Radiochemistry
- Metrology
Background:
- True coincidence summing (TCS) is a significant effect in gamma-ray spectrometry.
- Accurate correction factors are crucial for precise activity measurements.
- Monte Carlo methods are widely used for calculating these correction factors.
Purpose of the Study:
- To estimate uncertainties in Monte Carlo calculated TCS correction factors.
- To assess the contribution of TCS uncertainty to overall activity measurement uncertainty.
- To validate calculations using empirical data for 134Cs.
Main Methods:
- Monte Carlo simulations were employed to calculate TCS correction factors.
- A close-end coaxial p-type detector and a cylindrical glass fiber sample were used.
- Calculated correction factors and their uncertainties were compared to empirical data.
Main Results:
- Uncertainties in calculated TCS correction factors for the primary gamma ray of 134Cs were determined.
- The uncertainty in the calculated correction factor was found to be below 0.5%.
- This low uncertainty suggests a negligible contribution to combined uncertainty in activity measurements.
Conclusions:
- Monte Carlo calculations provide reliable TCS correction factors with low uncertainties.
- The estimated uncertainties are acceptable for applications such as environmental monitoring.
- The study validates the accuracy of the Monte Carlo approach for TCS correction.
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