CIPM MRA COMPARISON REPORTS
EURAMET.RI(I)-K5.2
Air kerma in Cs-137 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
EL Hansen
Norwegian Radiation and Nuclear Safety Authority (DSA)
Norway
PO 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 key comparison of air kerma standards of five participating
laboratories was carried out in 137
Cs 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 CIEMAT acting as the linking
laboratory to the BIPM key comparison, BIPM.RI(I)-K5. The comparison
results are published in the BIPM key comparison database (KCDB) under
the reference EURAMET.RI(I)-K5.2. The comparison was made indirectly
using one ionization chamber as transfer instrument. The results are
analysed and presented in terms of degrees of equivalence suitable for
entry in the BIPM key comparison database.