EURADOS 241Am skull measurement intercomparison
2 CIEMAT - Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
3 NCBJ - National Center for Nuclear Research
4 WSU - Washington State University
5 HMGU - Helmholtz Zentrum München = German Research Center for Environmental Health
6 CTU - Czech Technical University in Prague
7 BfS - Bundesamt für Strahlenschutz - Federal Office for Radiation Protection
8 STUK - Säteilyturvakeskus [Suomi] = Radiation and Nuclear Safety Authority in Finland = Autorité de sûreté nucléaire et de radioprotection [Finlande]
9 KIT - Karlsruhe Institute of Technology = Karlsruher Institut für Technologie
10 SCK-CEN - Centre d'Etude de l'Energie Nucléaire
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Résumé
In 2011 a measurement intercomparison was launched by EURADOS WG7, with the objective of providing the participants with the tools to calibrate their detection systems for detection of 241Am in the skull bone, and evaluate the variability due to the used of the different calibration phantoms. Three skull phantoms were used in this intercomparison the USTUR Case 0102 skull phantom, the BfS skull phantom and the CSR skull phantom. Very good agreement was found between the results of the twelve participating laboratories, with relative deviations of less than 15% for the BfS phantom and less than 17% for the USTUR phantom when measurement efficiency in defined positions was compared. However, the phantoms' measured absolute 241Am activities showed discrepancies of up to a factor of 3.4. This is mainly due to the physical differences between the standard calibration phantoms used by the participants and those used in this intercomparison exercise. © 2015 Elsevier Ltd. All rights reserved.