Radial distribution of dose within heavy charged particle tracks - Models and experimental verification using LiF:Mg,Cu,P TL detectors

摘要

A new method of experimental verification of radial dose distribution models using solid state thermoluminescent (TL) detectors LiF:Mg,Cu,P has been recently proposed. In this work the method was applied to verify the spatial distribution of energy deposition within a single Xe-131 ion track. Detectors were irradiated at the Department of Physics of the University of Jyvaskyla, Finland. The obtained results have been compared with theoretical data, calculated according to the Zhang et al., Cucinotta et al. and Geiss et al. radial dose distribution (RDD) models. At the lowest dose range the Zhang et al. ROD model exhibited the best agreement as compared to experimental data. In the intermediate dose range, up to 10(4) Gy, the best agreement was found for the ROD model of Cucinotta et al. The probability of occurrence of doses higher than 10(4) Gy within a single Xe-131 ion track was found to be lower than predicted by all the studied RDD models. This may be a result of diffusion of the charge, which is then captured by TL-related trapping sites, at the distances up to dozens of nanometers from the ionization site. (C) 2014 Elsevier Ltd. All rights reserved.