Kaya, Selim; Çeli̇k, Necati; Bayram, Tuncay

As well known, High Purity Germanium (HPGe) detectors have a wide range of applications in every area where radiation detection and measurements are involved. One of the most important parameters in this respect is the determination of the full energy peak (FEP) efficiency. There are certain parameters affecting the so-called FEP efficiency. Perhaps the most important one is the thickness of dead layers of the crystal itself. In the current study, we investigated the effects of the thickness of front, lateral and back dead layer thicknesses of the detector crystal on the FEP efficiencies for the energy range 30 keV–5 MeV using EGS4 Monte Carlo simulation package. It was shown that the change in the thickness of the front dead layer has significant effect on the efficiency values for the energy interval 30–400 keV. The change in the thickness of the lateral and back dead layer was shown to have significant effects on the efficiencies for the energy intervals 2–3 MeV and 3–5 MeV, respectively. The results were checked using GEANT4 and a good agreement was observed.

Bayram, Tuncay; Akkoyun, Serkan; Çelik, Necati; Haciislamoǧlu, Emel; Uruk, Serhat; Şentürk, Şevki; Ristic, G

131I is one of the radioisotopes in nuclear medicine procedures for diagnostic and treatment purposes. It decays to 131Xe by emitting beta particles. In this study, we have investigated the reproduction possibility of 131I from 131Xe by using different reactions, including a photonuclear reaction step. We have used TALYS computer program for calculating cross-sections of the reactions. It was seen that it was not an easy task to reproduce 131I from its decay product 131Xe because of low reaction cross-section values. According to the results, we have seen that the calculations are in harmony with the TENDL 2014 database.