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عنوان دوره: اولین دوره بین المللی و بیست و هشتمین دوره ملی (1400)

In the present work, the detection efficiency of alpha particles of an 241Am source (alpha energy = 5.486 MeV) for the ploycarbonate (PC) detector is calculated using Geant4 simulation toolkit. This simulation is based on the PC detector with 250 µm thickness under electrochemical (ECE) process and collimated alpha particles. Assuming a brass collimator with different lengths in air, various alpha energies ranged from 0.2 to 2.5 Mev are modeled. Also the bulk etching layer of 6 µm related to a given ECE process reported in the literature as well as a threshold stopping power of 240 keV µm-1 for foming the ECE tracks are given to Geant4 as the input data. The detection efficiency is determined as the ratio of registered tracks to the number of alpha particles reaching the PC detector surface. To validate the simulation, the results are compared with the experimental data reported in the literature corresponding to the above ECE conditions. It is found that the both results agree well within a maximum variation of 10%. Moreover, the Geant4 program used in this work can be applied to the other solid state nuclear track detectors (SSNTDs).

Geant4 simulation؛ Alpha particles؛ Detection efficiency؛ Polycarbonate