한국의학물리학회:학술대회논문집 (Proceedings of the Korean Society of Medical Physics Conference)
- 한국의학물리학회 2002년도 Proceedings
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- Pages.272-274
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- 2002
Contribution of light in high-energy film dosimetry using water substitute phantoms
- Fujisaki, Tatsuya (Dept. of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, Ibaraki) ;
- Saitoh, Hidetoshi (Tokyo Metropolitan University of Health Sciences, Tokyo) ;
- Hiraoka, Takeshi (National Institute of Radiological Sciences, Chiba) ;
- Kuwabara, Akio (Cancer Institute Hospital, Tokyo) ;
- Abe, Shinji (Dept. of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, Ibaraki) ;
- Inada, Tetsuo (Dept. of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, Ibaraki)
- 발행 : 2002.09.01
초록
The contribution of light in high-energy film dosimetry was examined using six commercially available solid water substitute phantoms. As six commercially available phantoms; RMI-451, Mix-DP, WE211, WE211-Black, PMMA and PMMA Black were evaluated in this study. It is difficult to evaluate the contribution of Cerenkov radiation and the optical permeability to the relative and/or absolute dosimetry using unpacked film in these phantoms. Therefore the contribution of Cerenkov radiation was estimated by the comparison between film densities in the shielded side (shutting off the light) and unshielded sides on a phantom. The effect of optical permeability was measured under ambient light by the time scale method. The results suggest that the use of black colored phantoms may improve the accuracy of dose measurement in film dosimetry.