EPJ Web of Conferences 278, 05001 (2023)
https://doi.org/10.1051/epjconf/202327805001

The Second EWGRD Round Robin: Inter Comparison of Gamma Spectrometry Measurements on Activation Dosimeters

^a Jacobs Engineering, Gloucester, United Kingdom
^b CEA, Service d’études des réacteurs et de mathématiques appliquées, Université Paris-Saclay, France
^c CEA, DES, IRESNE, DER, Cadarache, F-13108 St-Paul-lez-Durance, France
^d Instituto Superior Técnico, Universidade de Lisboa, Portugal
^e École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
^f Škoda JS, Plzen, Czech Republic
^g Budapest University of Technology and Economics, Hungary
^h Research Centre Řež, Czech Republic
ⁱ Kurchatov Institute, Moscow, Russia
^j CEA, Laboratoire National Henri Becquerel, France
^k Institute for Nuclear Research and Nuclear Energy of the Bulgarian Academy of Sciences, Bulgaria
^l National Centre for Nuclear Research, Poland
^m Jožef Stefan Institute, Slovenia
ⁿ NRG, Netherlands
^o SCK-CEN, Belgium

^* Corresponding author: dean.thornton@jacobs.com

Published online: 2 March 2023

Abstract

Following an initial Round Robin inter-comparison of gamma spectrometry measurements reported in 2014, this paper presents results from the first part of a second Round Robin inter-comparison commissioned by the European Working Group on Reactor Dosimetry in 2018. Measurements were performed by thirteen European organisations on a set of irradiated neutron activation detectors representative of those commonly used by the Reactor Dosimetry community to measure neutron fluence using gamma spectrometry methods. The radionuclides measured were ^110mAg, ⁵⁸Co, ⁶⁰Co, ⁵⁴Mn, and ⁴⁶Sc. The purpose of the exercise was to demonstrate the level of consistency between participating organisations in blind tests of measurements. The samples used were disks of iron, nickel, titanium, and two standard alloys of aluminium, one of 1% cobalt and the other 1% silver. They were irradiated in the MARIA reactor operated by National Centre for Nuclear Research, Poland. Participants provided their results to an independent referee who collated and compared the data. The results are presented in an anonymised form together with discussion and conclusions which may be drawn from the exercise. Good agreement was obtained with standard deviations for individual measurements between 2.0% (⁵⁴Mn) and 5.6% (⁶⁰Co). Overall, the results obtained from the latter Round Robin show less consistency than those from the first Round Robin, which is attributed to the participation of a wider pool of organisations.