A multi-year project involving multiple institutions and coordinated by the International Atomic Energy Agency (IAEA) has culminated in a paper published in the journal Physics in Medicine & Biology1. The paper, co-authored by a BIPM staff member, provides definitive values for the critical correction factors kQ that enter in the determination of the radiotherapy dose to cancer patients. The new values are derived from a combination of experiment and state-of-the-art Monte Carlo calculations at numerous NMIs and other institutes and have an uncertainty almost a factor of two better than the values currently recommended. They will be incorporated into the IAEA Code of Practice (TRS-398) used by clinicians when evaluating the dose output from their treatment machines. This Code of Practice is currently being revised by a small working group with BIPM participation.
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1. Andreo P et al 2020 Determination of consensus kQ values for
megavoltage photon beams for the update of IAEA TRS-398 Phys Med Biol in press https://doi.org/10.1088/1361-6560/ab807b