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KMID : 0391119930020020135
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Ulsan University Medical Journal
1993 Volume.2 No. 2 p.135 ~ p.137
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Scaling factor of Polystyrene Phanton for High Energy Photom Beam
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Abstract
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Authors have measured the output and percent depth dose(PDD) of 4MV and 10MV photon beams in polystyrene phantom to determine the scaling factor of that phantom. Output could be calculated with the TG-21 protocol and the results shows good
agreements
with those from water phantom(-1.4% for 4MV and 0.6% for 10MV.) And PDD's did not show significant differences between the data from water and those from polystyrene phantom. (0.998 for 4MV and 0.997 for 10MV) These results show scaling factors
need not
to be applied for polystyrene phantom for 4MV and 10MV beams, while TG-21 protocol recommends scaling factors 0.99 for 4MV, and 1.00 for 10MV photon beams.
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KEYWORD
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