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| NKS Programme Area: | NKS-B | | Research Area: | Measurement Strategy, Technology and QA | | Report Number: | NKS-504 | | Report Title: | Determination of Am-241 conversion coefficients from air kerma to dose equivalent – A Nordic measurement campaign | | Activity Acronym: | AmSpecNORDOS | | Authors: | Joonas Tikkanen, Reetta Nylund, Peter Kaidin Frederiksen, Anders Beierholm, Robert Billnert-Maróti, Anastasios Anastasiadis, Linda Persson, Per Otto Hetland, Elisabeth Lindbo Hansen, | | Abstract: | In radiation protection instrument calibrations, conversion coefficients from air kerma to dose equivalent are needed to convert an ionization chamber measurement result to the desired calibration quantity. These coefficients can be tabulated in standards, or have to be determined separately for the radia-tion beam in question. Am-241 is the primary choice of nuclide for energies in the X-ray range. The coefficients for Am-241 sources, according to the 2019 updated standard ISO 4037, need to be determined with spectrometry. The spectrometry method for determining the conversion coefficients have been established at STUK, and the STUK spectrometer and scientist visited other Nordic laboratories to determine conversion coefficients in their beams for the Am-241 sources. The differences in the coefficients between labs were 0.8 % at most, and the differences to monoenergetic coefficients for the main emis-sion of Am-241 of 59.5 keV less than 2 %. | | Keywords: | Instrument calibration, Am-241, conversion coefficients | | Publication date: | 11 Sept 2025 | | ISBN: | 978-87-7893-602-8 | | Number of downloads: | 7 | | Download: |  NKS-504.pdf |
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