Efficiency calibration of HPGe detector and covariance analysis

Energy-efficiency calibration of the HPGe detector and corresponding covariance analysis may be considered as integral parts in the determination of nuclear cross-section. In the present work, gamma spectroscopy measurement using co-axial n-type HPGe detector (DSG-German) coupled to a PC-based 16-K channel Multiport-II MCA (Canberra), efficiency calibration and corresponding covariance analysis have been investigated. The resolution of the detector system during counting was 0.14% at 1332.5keV γ-line of ⁶⁰Co. The standard calibration sources considered for the analysis are ¹³³Ba, ²²Na, ¹³⁷Cs and ⁶⁰Co. The covariance information obtained for the efficiencies of the HPGe detector with respect to γ-lines of standard calibration sources is further employed in the covariance analysis of efficiencies of the HPGe detector with respect to characteristic γ- lines of the reaction product ^116mIn. (author)