Title: Comparison of Triple-to-Double Coincidence Ratio (TDCR) Efficiency Calculations and Uncertainty Assessments for 99Tc
Authors: ZIMMERMAN B.e.ALTZITZOGLOU TimotheosRODRIGUES D.BRODA R.CASSETTE P.MO LRATEL G.SIMPSON B.VAN WYNGAARDT W.WÄTJEN C.
Citation: APPLIED RADIATION AND ISOTOPES vol. 68 no. 7-8 p. 1477-1481
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
Publication Year: 2010
JRC N°: JRC54918
ISSN: 0969-8043
URI: www.elsevier.com/locate/apradiso
http://publications.jrc.ec.europa.eu/repository/handle/JRC54918
DOI: 10.1016/j.apradiso.2009.11.046
Type: Contributions to Conferences
Abstract: A comparison exercise for data analysis was recently conducted by the Liquid Scintillation Counting Working Group (LSCWG) of the International Committee on Radionuclide Metrology (ICRM) to evaluate the uncertainties involved in applying different analysis methodologies (including computer programs) for the Triple-to-Double Coincidence Ratio (TDCR) method. The goals of the comparison were to (1) study differences in calculation results from different TDCR analysis programs, (2) investigate differences in analysis techniques and uncertainty assessment philosophies between laboratories, and (3) study the effect of not taking asymmetry of photomultiplier tube (PMT) efficiencies into account on the calculated activity To achieve this, a single set of TDCR data for the pure beta emitter 99Tc, was distributed to the participants, who analyzed the data according to their normal procedures and report the activity concentration of the 99Tc solution from their results. The results indicate that the presently used programs are generally able to calculate the same activity values, assuming that the correct input parameters are used and that not taking PMT asymmetry into account in the calculations can lead to significant (0.6 % for 99Tc) errors in reported results. The comparison also highlighted the need for a more rigorous approach to estimating and reporting uncertainties.
JRC Institute:Institute for Reference Materials and Measurements

Files in This Item:
There are no files associated with this item.


Items in repository are protected by copyright, with all rights reserved, unless otherwise indicated.