Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2016, Vol. 27 ›› Issue (4): 81 doi: 10.1007/s41365-016-0089-3

• NUCLEAR ELECTRONICS AND INSTRUMENTATION • Previous Articles     Next Articles

Monte Carlo method for determining the response of portable gamma detector for in situ measurement of terrestrial gamma ray field

Boubaker Askri 1,2   

  1. 1 Department of Physics, College of Science, Qassim University, P. O. Box 6666, Buraidah, Kingdom of Saudi Arabia
    2 Research Unit of Nuclear Physics and High Energy, Faculty of Sciences of Tunis, University of Tunis El Manar, 2092 Tunis, Tunisia
  • Contact: Boubaker Askri E-mail:askrib@gmail.com
Boubaker Askri. Monte Carlo method for determining the response of portable gamma detector for in situ measurement of terrestrial gamma ray field.Nuclear Science and Techniques, 2016, 27(4): 81     doi: 10.1007/s41365-016-0089-3
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Abstract:

A Monte Carlo method to study the response of portable detector to terrestrial gamma ray is proposed. This method is based on two-stage Monte Carlo simulation. First, the probability distributions of the phase space coordinates of the events that are most likely to be detected are reconstructed at the phase space shell level. The phase space shell is a closed surface enclosing the detector. The detector response to events originating from the phase space shell is then studied. The full absorption spectra as well as the partial absorption spectra are obtained for natural radionuclides uniformly distributed in the ground. For validation, this method is applied to a HpGe portable detector previously studied. The previous study is based on a semiempirical model. Good agreement is achieved when we compare the full-energy peak efficiencies and the total in situ spectra obtained by the two methods. As an application, the effective depth of the activity of the 137Cs artificial radionuclide in the soil is determined from the low-energy part of the total in situ spectrum.

Key words: Gamma ray spectroscopy,  Portable detector ; Monte Carlo,  Geant4 ; Radioactivity