Determination of efficiency of an aged HPGe detector for gaseous sources by self absorption correction and point source methods

Abstract

A: Methods for the determination of efficiency of an aged high purity germanium (HPGe) detector for gaseous sources have been presented in the paper. X-ray radiography of the detector has been performed to get detector dimensions for computational purposes. The dead layer thickness of HPGe detector has been ascertained from experiments and Monte Carlo computations. Experimental work with standard point and liquid sources in several cylindrical geometries has been undertaken for obtaining energy dependant efficiency. Monte Carlo simulations have been performed for computing efficiencies for point, liquid and gaseous sources. Self absorption correction factors have been obtained using mathematical equations for volume sources and MCNP simulations. Self-absorption correction and point source methods have been used to estimate the efficiency for gaseous sources. The efficiencies determined from the present work have been used to estimate activity of cover gas sample of a fast reactor. K: Efficiency for gaseous sources, HPGe detector, dead layer thickness, cover gas activity, Monte Carlo 1Corresponding author.

Efficient determination of HPGe γ-ray efficiencies at high energies with ready-to-use simulation software

“…Huy et al could trace an efficiency reduction back to an increase in the lithium dead layer of their ptype coaxial detector [46]. See also [47,48] and references therein.…”