Monte Carlo Modelling of a n-type coaxial high purity germanium detector

A modelling of a N-type coaxial germanium detector was performed with the Monte Carlo code MCNP to calculate the net peak areas in the spectra in the energy range from 50 to 1500 keV. Since the computed values based on manufacturer data on the detector deviate significantly (up to 60 %) from the experimental data, careful scanning measurement across the front area and the side of the detector were carried out using collimated photon beams in order to investigate the reason of the efficiency deficit. As a result, a much smaller active detector volume than described by the manufacturer was measured and the detector response over the crystal length was inhomogeneous. After adjustment of the detector dimensions in the MCNP modelling, the deviations between calculated and empirical were found to be less than 4% for the whole energy range.

BERNDT Reinhard;  MORTREAU Patricia; 

2012-10-11

ELSEVIER SCIENCE BV

JRC69322

0168-9002,   

https://publications.jrc.ec.europa.eu/repository/handle/JRC69322,   

10.1016/j.nima.2012.07.006,