Determination of Am-241 conversion coefficients and proposition for filtered S-Am beams
Autor(in); Institution
Tikkanen, Joonas; Radiation and Nuclear Safety Authority (STUK), Vantaa, FINLAND
Šolc, Jaroslav; Czech Metrology Institute (CMI), Brno, CZECH REPUBLIC
Sochor, Vladimir; Czech Metrology Institute (CMI), Brno, CZECH REPUBLIC
Toma, Susy; Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA), National Institute of Ionizing Radiation Metrology Santa Maria di Galeria, Rome, ITALY
Pinto, Massimo; National Institute of Ionizing Radiation Metrology Santa Maria di Galeria, Rome, ITALY
Michalik, Łukasz; Central Office of Measures (GUM), Warsaw, POLAND
Kowatari, Munehiko; Institute for Radiological Sciences, National Institute for Quantum Science and Technology (QST), Anagawa, JAPAN
Dosimetry concepts and apparatus ; Radiation calculations ; Spectrometers ; Models and simulations
Zusammenfassung
Am-241 sources are used for radiation protection meter calibrations, the radiation quality being denoted as S-Am. Because the differences in source encapsulation affect the low energy photon contribution to the fluence spectrum, currently, conversion coefficients from air kerma to dose equivalent (CCs) need to be determined for each individual source by spectrometric measurements. In this work, we propose using additional filtration in the S-Am beams, making the CCs independent of the source encapsulation and allowing the use of generic CCs without the necessity to use spectrometry. The effect of different filter materials on the CCs was studied by Monte Carlo simulations, and validated by spectrometric measurements. The recommended added filtration is 0.25mm of copper and 0.4mm of aluminum. Generic CCs that can be used with this filtration are given. In addition to the CCs being insensitive to source encapsulation thickness, issues with energy response of detectors related to differing X-ray contribution between different S-Am beams are solved by the added filtration. Therefore the authors recommend using the added filtration in all S-Am calibration beams.
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Open Access Hybrid
Rechteinformation
CC BY 4.0 ; Creative Commons Attribution 4.0 License
Themenbereich der Metrologie
Ionisierende Strahlung
Geschäftsfelder
Metrologie für die Gesellschaft
; Metrologie für die Wirtschaft
Förderinformationen (1)
Förderername: European Partnership on Metrology
Förderer ID: 0000 0005 0727 0588
Förderer ID Typ: ISNI
Förderprogramm: GuideRadPROS
Förderungsnummer: Grant Numbers: 22NRM07
Zitierung
Tikkanen, J., Šolc, J., Sochor, V., Toma, S., Pinto, M., Michalik, Ł., Kowatari, M., Zutz, H., & Siiskonen, T. (2026). Determination of Am-241 conversion coefficients and proposition for filtered S-Am beams. Journal of Instrumentation, 21, 1–15. https://doi.org/10.1088/1748-0221/21/04/P04027
