Modeling an HPGe detector response to gamma-rays using MCNP5 code

I. V. Prozorova (), R. R. Sabitova (), N. Ghal-Eh and S. V. Bedenko ()
Additional contact information
I. V. Prozorova: Institute of Atomic Energy, National Nuclear Center of the Republic of Kazakhstan, P.O. Box 071100, Kurchatov, Kazakhstan
R. R. Sabitova: School of Nuclear Science and Engineering, Tomsk Polytechnic University, P.O. Box 634050, Tomsk, Russia
N. Ghal-Eh: School of Physics, Damghan University, P.O. Box 36716-41167, Damghan, Iran4Department of Physics, Faculty of Sciences, Ferdowsi University of Mashhad, P.O. Box 91775-1436, Mashhad, Iran
S. V. Bedenko: School of Nuclear Science and Engineering, Tomsk Polytechnic University, P.O. Box 634050, Tomsk, Russia

International Journal of Modern Physics C (IJMPC), 2019, vol. 30, issue 11, 1-12

Abstract: The response function is the important information for the precise interpretation of experimental data and also for characterizing the developing nuclear instruments. Measurement of the response function normally requires a number of mono-energetic gamma-ray sources, a long acquisition time and an appropriate experimental setup. The Monte Carlo method, as an alternative to response function measurement, has widely been used and recommended. In this study, a computational model of an HPGe detector has been developed by using the MCNP5 code. To validate the simulated model, the simulations from mono-energetic sources have been compared to the corresponding measured data. Any deviation from the measurement could be attributed to the unmodeled details of the detector crystal, so they needed adjustment. Moreover, an analysis has been undertaken on the dependency of detection efficiency on the dead layer thickness of the germanium crystal. Having developed a computational model of the crystal, a set of correction factors was extracted to take into account the gamma-ray self-absorption within the source volume. The simulated model of the HPGe detector in this study can be used to calculate the detection efficiency when the samples are not of the standard geometry which require self-absorption considerations.

Keywords: HPGe; MCNP5; dead layer; gamma-ray (search for similar items in EconPapers)
Date: 2019
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DOI: 10.1142/S0129183119500992

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