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Modelling of STEFF NaI detectors using the MCBEND Monte Carlo code.

Cubiss, James Gerald

[Thesis]. Manchester, UK: The University of Manchester; 2013.

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Abstract

The MCBEND program provided by the ANSWERS group at AMEC is a general purpose radiation transport code for electron, neutron and gamma-ray transportation, within systems in a sub-critical state. The program was used to model the response of a NaI, cylindrical detector of dimensions 51 mm diameter and 51 mm depth, to gamma ray energies of 1.173 MeV and 1.332 MeV produced by the decay of a 60Co source. Two further programs were then used, one to produce a broadening on the data in order to replicate the effects of the energy resolution of the detector and another to generate a sum peak such as the one observed in the experimental results.Comparisons were made between the MCBEND, MCNP and GEANT4 Monte Carlo codes. This was done by modelling the response of a STEFF NaI detector to the decay of a 60Co source. A simulation was also run for a gamma-ray of energy 4 MeV for each code in order to see how they dealt with high energy gamma-ray calculations.A reference library was created using MCBEND for gamma-ray energies ranging from 50 keV to 1.5 MeV in 50 keV steps. Using published intensities and energies, a 152Eu spectrum was modelled using MCBEND and compared to an experimentally measured one.