Determination of consensus k(Q) values for megavoltage photon beams for the update of IAEA TRS-398

• Type: Article in International Scientific Journal
• Date: 2020

Authors

Andreo, P (Author) Other; Burns, DT (Author) Other; Kapsch, RP (Author) Other; McEwen, M (Author) Other; Vatnitsky, S (Author) Other; Andersen, CE (Author) Other; Ballester, F (Author) Other; Borbinha, J (Author) Other; Delaunay, F (Author) Other; Francescon, P (Author) Other; Hanlon, MD (Author) Other; Mirzakhanian, L (Author) Other; Muir, B (Author) Other; Ojala, J (Author) Other; Oliver, CP (Author) Other; Pimpinella, M (Author) Other; Pinto, M (Author) Other; de Prez, LA (Author) Other; Seuntjens, J (Author) Other; Sommier, L (Author) Other; Teles, P (Author) FCUP; Tikkanen, J (Author) Other; Vijande, J (Author) Other; Zink, K (Author) Other

Journal

Title: Physics in Medicine and Biology

Vol. 65

ISSN: 0031-9155

Publisher: Institute of Physics Publishing

Indexing

ISI Web of Knowledge - 21 Citations

Scopus - 26 Citations

Other information

Authenticus ID: P-00S-5GE

DOI: 10.1088/1361-6560/ab807b

Abstract (EN): 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, k(Q), 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 k(Q) 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<i factors for cylindrical and plane-parallel chamber types in Co-60 beams have also been obtained with an estimated uncertainty of 0.4%.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 13