CIPM MRA COMPARISON REPORTS
EURAMET.RI(I)-S19
Air kerma in Am-241 and Co-60 radiation protection beams
Published on 20/02/2026 - © 2026 L. Persson
et al
Citation L. Persson
et al 2026 CIPM MRA Comparison reports
Authors
L. Persson
Swedish Radiation Safety Authority (SSM)
Sweden
E. L. Hansen
Norwegian Radiation and Nuclear Safety Authority (DSA)
Norway
P. O. Hetland
Norwegian Radiation and Nuclear Safety Authority (DSA)
Norway
N. A. Cornejo Díaz
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT)
Spain
M. Kelly
National Physical Laboratory (NPL)
United Kingdom
J. Lillhök
Swedish Radiation Safety Authority (SSM)
Sweden
R. Nylund
Radiation and Nuclear Safety Authority (STUK)
Finland
J. Huikari
Radiation and Nuclear Safety Authority (STUK)
Finland
Abstract
A supplementary comparison of air kerma standards of five participating
laboratories was carried out in 241
Am and 60
Co radiation beams at radiation protection level, from June 2024 to
January 2025. Three of the participating laboratories are secondary
standards laboratories (DSA, STUK, and SSM) and NPL and CIEMAT are
primary standards laboratories, with NPL providing the reference values
for the comparison. The comparison results are published in the BIPM key
comparison database (KCDB) under the reference EURAMET.RI(I)-S19. The
comparison was made indirectly using two ionization chambers as transfer
instruments. The results are analysed and presented in terms of ratios
of the calibration coefficients provided by the participants with
respect to the comparison reference values.