A few Remarks on TVS-EP Film for Measurement of Dose Distributions in High Energy X Rays

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  • 高エネルギーX線の線量分布測定を目的としたTVS-EPフィルムの特性

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Abstract

Dosimetry of small radiation fields for 6 MV and 18 MV x rays have been evaluated with the use of silver halide film such as the XV2 Ready-pack (Kodak) and TVS-EP (CEA) films, and with the radiochromic film MD-55 (ISP Technologies). We compared the characteristics of the films with a 0.006 cm3 ionization chamber (MC-110, Applied Engineering).<BR>The sensitivity of the radiochromic film is less than one hundred ths of that of silver halid films. It was also that there were found linear relationship between a optical density of the radiochromic film and an irradiation dose only in a very narrow range. For this reason, the use of radiochromic film is unsuitable in the dosimetry for the accelerator.<BR>Compared to XV2 Ready-pack, there is linea rity between optical density of the TVS-EP film and a much larger range of the irradiation dose. The sensitivty of the TVS-EP film is not dependent on the direction of the incident x-rays and is independent on the energy of the x-rays. The optical density of the TVS-EP film agreed with the ionization chamber dosimetry when the field size were varied. But, there is a limitation in using silver halide films in dosimetry. This limitation is due to various difficulties associated with intrinsic characteristics of the film, such as in developing processes and also in the measurement of the optical density. Therefore, dosimetry with the improved small size ionization chamber seems to be the most suitable on small field dosimetry.

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