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• W2034398675 abstract "Neutrons are a by‐product of high‐energy x‐ray radiation therapy (threshold for reactions in high‐ material ). Neutron production varies depending on photon beam energy as well as on the manufacturer of the accelerator. Neutron production from modern linear accelerators (linacs) has not been extensively compared, particularly in terms of the differences in the strategies that various manufacturers have used to implement multileaf collimators (MLCs) into their linac designs. However, such information is necessary to determine neutron dose equivalents for different linacs and to calculate vault shielding requirements. The purpose of the current study, therefore, was to measure the neutron spectra from the most up‐to‐date linacs from three manufacturers: Varian 21EX operating at 15, 18, and , Siemens ONCOR operating at 15 and , and Elekta Precise operating at 15 and . Neutron production was measured by means of gold foil activation in Bonner spheres. Based on the measurements, the authors determined neutron spectra and calculated the average energy, total neutron fluence, ambient dose equivalent, and neutron source strength. The shapes of the neutron spectra did not change significantly between accelerators or even as a function of treatment energy. However, the neutron fluence, and therefore the ambient dose equivalent, did vary, increasing with increasing treatment energy. For a given nominal treatment energy, these values were always highest for the Varian linac. The current study thus offers medical physicists extensive information about the neutron production of MLC‐equipped linacs currently in operation and provides them information vital for accurate comparison and prediction of neutron dose equivalents and calculation of vault shielding requirements." @default.
• W2034398675 created "2016-06-24" @default.
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• W2034398675 date "2009-08-12" @default.
• W2034398675 modified "2023-10-18" @default.
• W2034398675 title "Secondary neutron spectra from modern Varian, Siemens, and Elekta linacs with multileaf collimators" @default.
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• W2034398675 doi "https://doi.org/10.1118/1.3159300" @default.
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