A method for establishing absolute full-energy peak efficiency and its confidence interval for HPGe detectors

作者：Rizwan U^*; Chester A; Domingo T; Starosta K; Williams J; Voss P

来源：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment , 2015, 802: 102-112.

DOI：10.1016/j.nima.2015.08.071

• HPGe detector
• Absolute efficiency calibrations
• Confidence interval
• Linearized least squares fitting

A method is proposed for establishing the absolute efficiency calibration old HPGe detector including the confidence interval in the energy range of 79.6-3451.2 keV. The calibrations were accomplished with the Ba-133, Co-66, Co-56 and Eu-152 point-like radioactive sources with only the Co-66 source being activity calibrated to an accuracy of 2% at the 90% confidence level. All data sets measured from activity calibrated and uncalibrated sources were fit simultaneously using the linearized least squares method. The proposed fit function accounts for scaling of the data taken with activity uncalibrated sources to the data taken with the high accuracy activity calibrated source. The confidence interval for the fit was found analytically using the covariance matrix. Accuracy of the fit was below 3.5% at the 90% confidence level in the 79.6-3451.2 key energy range.

• 出版日期2015-12-1