Abstract
In this work, a polycarbonate (PC) detector with 250μm thickness and 2 cm × 2 cm dimension exposed to alpha particles of an 241Am source is simulated by Geant4 toolkit. Different energies of alpha particles ranging from 0.2 to 5.0 MeV are considered. Spheres with 2μm diameter randomly positioned within the etching layer of the PC are considered as the sensitive volumes. Considering the threshold of 240 keV μm−1 for forming the tracks, specific energy distribution for any alpha energy is computed. Finally, the number of tracks and the detection efficiency are calculated applying the microdosimetric one-hit detector formulation. It is found that the obtained efficiencies differ at most 10% and 12% from the previous simulation and the measurements (adapted with the two different etchings), respectively.
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