Experimental and Calculated Response of a Radiochromic Dye Film Dosimeter to High-LET Radiations

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Abstract
Dose-response characteristics were measured for the FWT [Far West Technology] 60 nylon-base radiochromic dye film dosimeter irradiated with ion beams of 3- and 16-MeV protons, 10-MeV .alpha. particles, and 21-MeV 7Li, 42-MeV 14N, and 64 MeV 16O ions. These characteristics were compared with the response to reference low-LET [linear energy transfer] radiations, i.e., 60Co .gamma. rays and 10-MeV electrons. The ion beams covered an initial LET range of 29-5430 MeV cm2 g-1 corresponding to an average LET in the detector of 28-6740 MeV cm2 g-1. The experimental relative effectiveness (RE) decreased monotonically with .**GRAPHIC**. from 1.00 for 16-MeV protons to 0.81, 0.55, 0.47, 0.36, and 0.28 for 3-MeV protons, .alpha. particles, and 7Li, 16O, and 14N ions, respectively. The radial dose distribution around the ion path was calculated using 2 different range-energy relations for the .delta. rays: a linear relation r = k1, .cntdot. .omega. and a power-law relation r = k2 .cntdot. .omega..alpha., where r is the range and .omega. the energy of the .delta. rays. Calculations of theoretical RE values, based on the track structure theory of Katz and co-workers, were in good agreement with experimental results. The best agreement (-6.2 to +14.3%) was obtained by using a power-law-range-energy relation.

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