Comparisons of air kerma and absorbed dose to water standards in Co-60 radiation beams for radiotherapy

Research output: Contribution to journalArticlepeer-review


  • Christian Kottler
  • Andreas Steurer
  • Frank Delaunay
  • Jacco de Pooter
  • Cristina Garcia Mulas
  • Cristian Mihailescu

Institutes & Expert groups

  • Federal Institute of Metrology METAS
  • BEV - Bundesamt für Eich- und Vermessungswesen
  • LNHB - Laboratoire National Henri Becquereal
  • VSL, Thijsseweg 11, 2629 JA Delft
  • CIEMAT - Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas

Documents & links


The air kerma and absorbed dose to water standards for 60Co radiotherapy beams of 6 EURAMET NMIs were compared by circulating 2 transfer standards. The schedule for the measurements lasted from March 2013 to February 2015. The participants determined the calibration coefficients for the 2 transfer standards in both radiation quantities mentioned above. The comparison results are given in terms of air kerma and absorbed dose to water for both transfer standards as the ratio of the participants' calibration coefficients to the respective average values over all participants. Two participating NMIs, BEV and METAS, measured the transfer standards twice and three times, respectively. Hence, submeans were calculated and propagated as their respective repeated measurements are correlated.

The results are also linked to the BIPM.RI(I)-K1 and BIPM.RI(I)-K4 key comparisons through the linking laboratories BEV, LNE-LNHB and VSL for the air kerma and BEV, LNE-LNHB and METAS for the absorbed dose to water standards.


Original languageEnglish
Article number06013
Number of pages17
Issue number1A
Publication statusPublished - 2020


  • Air Kerma, Radiation beams, Radiotherapy, Comparison

ID: 7077566