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Different Methods of Measuring Neutron Dose/Fluence Generated During Radiation Therapy With Megavoltage Beams Publisher Pubmed



Farhood B1 ; Ghorbani M2 ; Abdi Goushbolagh N3 ; Najafi M4 ; Geraily G5
Authors

Source: Health Physics Published:2020


Abstract

Medical linear accelerators (linacs) are the most frequently applied radiation therapy machines in the locoregional treatment of cancers by producing either high-energy electron or photon beams. However, with high-energy photons (>8 MeV), interaction of these photons with different high-Z nuclei of materials in components of the linac head unavoidably generates neutrons. On the other hand, the average energy of these generated neutrons has almost the highest radiation-weighting factor. Therefore, the produced neutrons should not be neglected. There are various tools for the measurement of neutron dose/fluence generated in a megavoltage linac, including thermoluminescent dosimeters, solid-state nuclear track detectors, bubble detectors, activation foils, Bonner sphere systems, and ionization chamber pairs. In this review article, each of the above-mentioned dosimetric methods will be described in detail. © 2019 Health Physics Society.
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