Efficiency calibration of a coaxial HPGe detector-Marinelli beaker geometry using an Eu-152 source prepared in epoxy matrix and its validation by efficiency transfer method

In this study, an in-house Eu-152 calibration source was produced from a custom epoxy matrix with a density of rho = 1.14 g cm(-3), which is chemically stable and durable form after its solidification. The homogeneity of Eu-152 in matrix was obtained better than 98%. For a Marinelli beaker geometry, an efficiency calibration procedure was applied to a n-type, coaxial, 78.5% relative efficient HPGe detector in the energy range of 121.7-1408.0 keV by using in-house Eu-152 calibration source. Then the measured efficiencies for Marinelli geometry were compared with the results calculated by MEFFTRAN and ANGLE softwares for the validation. Although MEFFTRAN and ANGLE have two different efficiency transfer algorithms to calculate the efficiencies, they usually need to use a reliable and accurate reference efficiency values as input data.