Abstract
A number of parameters, important for planning cancer treatment with heavy ions, were determined by an experiment where irradiated tissue was simulated by Plexiglas (C 5H 8O 2). CR-39 solid state nuclear track detectors were used to measure the number of projectile fragments formed due to the interaction of a 292 MeV/n 19F beam with a 2.5 cm thick Plexiglas target. From these measurements the partial cross-sections of fluorine fragmentation leading to the production of oxygen, nitrogen, carbon and boron nuclei were found to be (131 ± 10) mb, (100 ± 9) mb, (113 ± 9) mb and (53 ± 6) mb, respectively. Also, the linear energy transfer distribution due to the primary beam and its measured fragments which traversed a given thickness of Plexiglas was obtained. By measuring track opening positions on both sides of two detector foils, the angular spread of the primary beam in the target was found to be (0.22 ± 0.02)°.
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