Key comparisons of air kerma and absorbed dose to water standards in Co60radiation beam (EURAMET.RI(I)-K1.3 and EURAMET.RI(I)-K4.3)

R. Nylund, L.A. de Prez, P.O. Hetland, C.E. Andersen, P. Aviles, C.G. Mulas, Z. Msimang, L. Czap, L. Persson

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Abstract

A key comparison of the standards for air kerma and absorbed dose to water of seven participating laboratories was carried out in the 60Co radiation beam, therapy level, during October 2021 to November 2022. Six of the participating laboratories are secondary standards laboratories (SSM, DSA, STUK, DTU, CIEMAT, and IAEA) and VSL is a primary standards laboratory and acted as a linking laboratory to respective BIPM key comparisons. The comparison results are published in the BIPM key comparison database (KCDB) under the reference EURAMET.RI(I)-K1.3 and EURAMET.RI(I)-K4.3. The comparison was made indirectly using three thimble-type ionization chambers as transfer instruments. The results are analyzed and presented in terms of degrees of equivalence suitable for entry in the BIPM key comparison database.
Original languageEnglish
Number of pages32
Publication statusPublished - 2023

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