access icon openaccess Monte Carlo simulation of HPGe gamma-spectrometry systems

This is an open access article published by the IET under the Creative Commons Attribution-NonCommercial-NoDerivs License (http://creativecommons.org/licenses/by-nc-nd/3.0/)
Received 17/10/2018, Accepted 08/01/2019, Published 25/03/2019

In order to obtain the relationship between energy and channel, the suitable radionuclides are chosen to calibrate. The result shows a goodness of fitting. The Monte Carlo simulation about the detection efficiency of the high purity germanium (HPGe) gamma-spectrometry system was performed. The distance between radioactive source and the end cap is set 15, 20, 25 and 50 cm, respectively. The maximum absolute efficiency locates at around 80 keV. It can be concluded that the absolute efficiency is declining accompany with the increasing of distance. In the end, at the distance of 25 cm, the authors changed thickness of the dead layer and the source distribution to calculate. The maximum absolute efficiency is 8.56E−03, and the relative deviation is 0.0011. Then it was compared with the experimental result provided with the manufacturer. The result of simulation shows a certain agreement with the experimental results. This work will be helpful for calculating the efficiency of HPGe gamma-spectrometry.

Inspec keywords: calibration; radioactive sources; gamma-ray spectroscopy; germanium radiation detectors; Monte Carlo methods; radioisotopes; gamma-ray detection

Other keywords: HPGe gamma-spectrometry systems; distance 15.0 cm; distance 50.0 cm; Monte Carlo simulation; radionuclides; detection efficiency; maximum absolute efficiency locates; dead layer; high purity germanium gamma-spectrometry system; radioactive source; distance 25.0 cm; source distribution; distance 20.0 cm

Subjects: Radiation measurement, detection and counting; Measurement standards and calibration; Probability theory, stochastic processes, and statistics; Semiconductor detectors; X- and gamma-ray spectroscopy; Radioactive sources; Particle and radiation detection and measurement; Particle sources and targets; Monte Carlo methods; X-ray, gamma-ray instruments and techniques; Measurement standards and calibration; X-ray and gamma-ray equipment

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