Journal article
Experimental and Calculated Response of a Radiochromic Dye Film Dosimeter to High-LET Radiations
Dose-response characteristics were measured for the FWT 60 nylon-base radiochromic dye film dosimeter irradiated with ion beams of 3- and 16-MeV protons, 10-MeV α particles, and 21-MeV ${}^{7}{\rm Li}$, 42-MeV 14 N, and 64-MeV 16 O ions. These characteristics were compared with the response to reference low-LET radiations, i.e., 60 Co γ rays and 10-MeV electrons.
The ion beams covered an initial LET range of 28-5430 MeV ${\rm cm}^{2}\ {\rm g}^{-1}$ corresponding to an average LET in the detector of 28-6740 MeV ${\rm cm}^{2}\ {\rm g}^{-1}$. The experimental relative effectiveness (RE) decreased monotonically with $z_{{\rm eff}}^{2}/\beta ^{2}$ from 1.00 for 16-MeV protons to 0.81, 0.55, 0.47, 0.36, and 0.28 for 3-MeV protons, α particles, and ${}^{7}{\rm Li},{}^{16}{\rm O}$, and 14 N ions, respectively.
The radial dose distribution around the ion path was calculated using two different range-energy relations for the δ rays: a linear relation $r=k_{1}\cdot \omega $ and a power-law relation $r=k_{2}\cdot \omega ^{\alpha}$, where r is the range and ω the energy of the δ 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.
Language: | English |
---|---|
Publisher: | Academic Press, Inc. |
Year: | 1984 |
Pages: | 1-15 |
ISSN: | 19385404 , 00337587 and 04858611 |
Types: | Journal article |
DOI: | 10.2307/3576183 |