Investigation of a HPGe Detector’s Geometry Using X-Ray Computed Tomography in Collaboration with Monte Carlo Method

H. I. Khedr, M. Abdelati, K. M. El Kourghly

Reliable, accurate information about the detector geometry specifications are required to determine the detector full energy peak efficiency, using the general Monte Carlo simulation code (MC). Due to the incomplete detector geometry specifications given by the manufacturer a CT scanner (X-ray Computed Tomography) has been used to illustrate the physical dimensions, housing and placement of the detector crystal. Also, HPGe detector has been scanned using a collimated reference source (137Cs) to estimate the dead-layer as well as inner hole of the crystal. Obtained information and available manufacturer data are used to generate MCNP5 input file. Estimated dead-layer was a round 0.6 mm for the front facet and about 0.4 mm for the side. To validate MCNP5 model activity of reference point source (137Cs, 60Co and 133Ba) has been estimated. Calculated activity was in agreement with the reference value within relative difference less than 2%. Mass of 235U contents in a reference volume sources has been estimated with relative different less 1%.

https://dx.doi.org/10.31873/IJEAS.6.8.2019.08