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MCNP modelling of scintillation-detector gamma-ray spectra from natural radionuclides
P H G M Hendriks1, M Maucec, R J de Meijer
1Rijksuniversiteit Groningen, Nuclear Geophysics Division, Kernfysisch Versneller Instituut, Zernikelaan 25, 9747 AA Groningen, The Netherlands.
Abstract:
gamma-ray spectra of natural radionuclides are simulated for a BGO detector in a borehole geometry using the Monte Carlo code MCNP. All gamma-ray emissions of the decay of 40K and the series of 232Th and 238U are used to describe the source. A procedure is proposed which excludes the time-consuming electron tracking in less relevant areas of the geometry. The simulated gamma-ray spectra are benchmarked against laboratory data.