Journal article
Determination of consensus kQ values for megavoltage photon beams for the update of IAEA TRS-398
Karolinska Institutet1
Commissariat à l’énergie atomique et aux énergies alternatives2
Azienda Sanitaria Ulss 6 Vicenza3
Australian Radiation Protection and Nuclear Safety Agency4
McGill University5
Tampere University6
Agenzia nazionale per le nuove tecnologie, l'energia e lo sviluppo economico sostenibile7
Dutch National Metrology Institute8
Radiation and Nuclear Safety Authority9
University of Applied Sciences Mittelhessen10
Bureau international des poids et mesures11
Physikalisch-Technische Bundesanstalt12
National Research Council of Canada13
MedAustron14
Department of Health Technology, Technical University of Denmark15
Dosimetry, Hevesy and Dosimetry, Department of Health Technology, Technical University of Denmark16
University of Valencia17
University of Lisbon18
...and 8 moreThe 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%.
Language: | English |
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Year: | 2020 |
Pages: | 095011 |
ISSN: | 13616560 and 00319155 |
Types: | Journal article |
DOI: | 10.1088/1361-6560/ab807b |
ORCIDs: | Andersen, C. E. , 0000-0002-2476-2419 , 0000-0002-8122-7084 , 0000-0002-7470-4356 and 0000-0001-5785-4101 |