The detecting efficiency of HPGe detector

Abstract

Measurements of HPGe efficiency were made by several standard gamma-ray sources. Analysis was made by the way of measurement and Monte Carlo calculation program. The efficiency results of calculation agreed with the measurement in the accuracy of 4%. At sufficient distance from the detector, the efficiency of point source equaled to plate source in 1 %, and the gamma-ray self-absorption of plate source can be calculated by the parallel beam geometry. However, when the plate source was close to the detector, the expression for the parallel beam geometry does not apply because of the oblique angles of the gamma rays accepted by the detector. The sample absorption can be calculated with Monte Carlo techniques.

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