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• W2128795037 abstract "The peak scatter factor (PSF) for a photon beam is defined as the ratio of the total dose and the primary dose at the depth of dose maximum. The values of the PSF for photon beams ranging from to 24 MV are calculated using the EGS4 Monte Carlo technique, to avoid measurement difficulties. The calculation shows that the effect of SSD on PSF for high energy photon beams is not significant for small fields, but can be as high as 1% for large fields. For the beam, the calculation agrees with the data tabulated on BJR Supplement 25 to within 0.8%. The BJR value (1.054) of for is 0.6% lower than the present value due to the underestimation of scatters from the source capsule and collimators. For a given field size, PSF is varied by up to 2% when beam quality changes from to 24 MV. For normalized PSF, the values of BJR Supplement 25 (which are assumed to be the same for beams ranging from to 50 MV) agree well with the present calculation for small field sizes, but are higher than our data by up to 2% for large field sizes. The presently calculated PSFs are related to field size(s) by an empirical expression, where m and n are the fitting parameters. This equation describes the PSFs within 0.4% (0.15% on average)." @default.
• W2128795037 created "2016-06-24" @default.
• W2128795037 creator A5080797525 @default.
• W2128795037 date "1999-06-01" @default.
• W2128795037 modified "2023-10-18" @default.
• W2128795037 title "Peak scatter factors for high energy photon beams" @default.
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• W2128795037 doi "https://doi.org/10.1118/1.598489" @default.
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