Efficiency calibration of a HPGe detector for the measurement of the primary coolant

Abstract

This paper describes a method of calibrating the efficiency of a Ge c-ray spectrometer. 226 Ra and 232 Th were selected to produce the soil calibration source, and then several c-rays with high emission probabilities in 226 Ra's decay products and 232 Th's decay products, along with 2754 keV c-rays of 24 Na in the primary coolant sample of PWR, were employed to perform efficiency calibration. After self-absorption correction and true coincidence summing correction, we obtained the efficiency curve of a U70 9 30 mm aqueous calibration source over the high energy range (1120-2754 keV).