Determination of consensus kQ values for megavoltage photon beams for the update of IAEA TRS-398
Creators
- 1. Karolinska University Hospital and Karolinska Institutet, Stockholm, SwedenKarolinksa
- 2. International Bureau of Weights and Measures (BIPM), Paris, France
- 3. Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany
- 4. National Research Council of Canada (NRCC), Ottawa, Canada
- 5. MedAustron, Wiener Neustadt, Austria
- 6. Technical University of Denmark (DTU), Roskilde, Denmark
- 7. IRIMED Joint Research Unit (IIS La Fe - University of Valencia), Valencia, Spain
- 8. Centro de Ciências e Tecnologias Nucleares, IST-UL, Bobadela, Portugal
- 9. CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), Gif-sur-Yvette, France
- 10. San Bortolo Hospital, Vicenza, Italy
- 11. Australian Radiation Protection and Nuclear Safety Agency (ARPANSA), Yallambie, Australia
- 12. McGill University, Montreal, Canada
- 13. Tampere University Hospital (Tays), Tampere, Finland
- 14. National Institute for Ionising Radiation Metrology (ENEA), Rome, Italy
- 15. SL–Dutch Metrology Institute, Delft, The Netherlands
- 16. Radiation and Nuclear Safety Authority (STUK), Helsinki, Finland
- 17. Technische Hochschule Mittelhessen (THM), Giessen, Germany
Description
The IAEA is currently coordinating a multi-year project to update the TRS-398 Code of Practice for the dosimetry of external beam radiotherapy based on standards of absorbed dose to water. One major aspect of the project is the determination of new beam quality correction factors, kQ, for megavoltage photon beams consistent with developments in radiotherapy dosimetry and technology since the publication of TRS-398 in 2000. Specifically, all values must be based on, or consistent with, the key data of ICRU Report 90.
Data sets obtained from Monte Carlo (MC) calculations by advanced users and measurements at primary standards laboratories have been compiled for 23 cylindrical ionization chamber types, consisting of 725 MC-calculated and 179 experimental data points. These have been used to derive consensus kQ values as a function of the beam quality index TPR20,10 with a combined standard uncertainty of 0.6%. Mean values of MC-derived chamber-specific fch factors for cylindrical and plane-parallel chamber types in 60Co beams have also been obtained with an estimated uncertainty of 0.4%.
Notes
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Andreo 2020 kQ_values_for_MV_photons 200406.pdf
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Additional details
Related works
- Is previous version of
- Journal article: 10.1088/1361-6560/ab807b (DOI)