Monte Carlo Calculation Of HPGe GEM 15P4 Detector Efficiency In The 59 - 2000 keV Energy Range

A precise model of a 15% relative efficiency p-type HPGe GEM 15P4 detector was created for peak efficiency curves determination using the MCNP5 code developed by The Los Alamos Laboratory. The dependence of peak efficiency on distance from the source to detector was also investigated. That model was validated by comparing experimental and calculated results using six standard point sources including 133Ba, 109Cd, 57Co, 60Co, 22Na and 65Zn. The sources used for more simulating are 241Am, 75Se, 113Sn, 85Sr, 54Mn, 137Cs, 56Co, 94Nb, 111In, 139Ce, 228Th, 243Am, 154Eu, 152Eu and 88Y according to IAEA-TECDOC-619 document. All these sources have the same geometry. The ratio of the experimental efficiencies to calculated ones are higher than 0.94. This result indicates that our simulation program based on MCNP5 code is good enough for later studies on this HPGe spectrometer which is located in Nuclear Physics Laboratory at HCMC University of Pedagogy. (author)