Uncertainties in calculated correction factors for true coincidence-summing (TCS)

J Kastlander; L-E De Geer; S Jonsson; H Ramebäck

doi:10.1016/j.apradiso.2017.01.039

Uncertainties in calculated correction factors for true coincidence-summing (TCS)

Appl Radiat Isot. 2017 Apr:122:174-179. doi: 10.1016/j.apradiso.2017.01.039. Epub 2017 Jan 31.

Authors

J Kastlander¹, L-E De Geer², S Jonsson³, H Ramebäck⁴

Affiliations

¹ Swedish Defence Research Agency (FOI), Division of CBRN Defence and Security, SE-164 90 Stockholm, Sweden. Electronic address: [email protected].
² Swedish Defence Research Agency(FOI), Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO), Flädervägen 51, SE-19464 Upplands Väsby, Sweden. Electronic address: [email protected].
³ Swedish Defence Research Agency (FOI), Division of CBRN Defence and Security, SE-901 82 Umeå, Sweden.
⁴ Swedish Defence Research Agency (FOI), Division of CBRN Defence and Security, SE-901 82 Umeå, Sweden; Chalmers University of Technology, Department of Chemistry and Chemical Engineering, SE-412 96 Göteborg, Sweden.

PMID: 28161650
DOI: 10.1016/j.apradiso.2017.01.039

Abstract

The aim of this work was to estimate the uncertainties in Monte Carlo calculated correction factors for true coincidence summing (TCS). In this work TCS-factors and their uncertainties were calculated for ¹³⁴Cs and then the corrected activities compared to empirical data. The study was carried out using a close-end coaxial p-type detector (Ø80mm×54.5mm, 80% relative efficiency) and a cylindrical glass fiber sample (Ø60mm×14mm). It was shown that the uncertainty in the calculated correction factor for the primary gamma ray was below 0.5%, which means it will not contribute significantly to the combined uncertainty in an activity measurement for e.g. environmental monitoring.