This work presents new calculations of conversion coefficients (CCs) from total air kerma to dose-equivalent quantitiesH'(0.07),H'(3),H*(10),Hp(0.07),Hp(3), andHp(10) for area and personal dosimetry for mono-energetic photons in the energy range from 2 keV to 50 MeV, assuming secondary charged particle equilibrium. Calculations using the Monte Carlo N-Particle® (MCNP) code were performed for a large number of photon energies with the aim of preventing errors resulting from possible improper interpolation between currently available sparsely spaced CC values, when an average CC value over a photon fluence spectrum needs to be determined. The CC values were compared with the values published in the ISO 4037-3:2019 standard. A very close agreement was achieved for the majority of CCs. Larger discrepancies were found for some CCs, often for low photon energies or large angles of radiation incidence, which were taken from older publications or when CC values were interpolated or extrapolated. Furthermore, some differences were found in the MeV energy range, which are significant for dosimeter calibrations, e.g. the presented values of CC toH*(10) for the main photon energies of137Cs and60Co radionuclides are both lower by 2.8%. Finally, it was found that the values of CCs toHp(0.07;E, α)slabgiven in ISO 4037-3:2019 were not taken correctly from the source publication. In conclusion, the CC values given in ISO 4037-3:2019 should be updated in view of the results obtained.

Belgian Nuclear Research Centre Boeretang 200 B 2400 Mol Belgium

Czech Metrology Institute Okruzni 31 638 00 Brno Czech Republic

Department of Radiation and Environmental Protection Vinča Institute of Nuclear Sciences National Institute of the Republic of Serbia University of Belgrade PO Box 522 11001 Belgrade Serbia

Istituto Nazionale di Metrologia delle Radiazioni Ionizzanti Italy

National Metrology Laboratory for Ionising Radiation Avda Complutense 40 28040 Madrid Spain

Physikalisch Technische Bundesanstalt Bundesallee 100 38116 Braunschweig Germany

Radiation and Nuclear Safety Authority Jokiniemenkuja 1 01370 Vantaa Finland

Ruđer Bošković Institute Bijenička cesta 54 10000 Zagreb Croatia

The Instituto Superior Técnico Av Rovisco Pais 1 1049 001 Lisboa Portugal

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