High Counting Efficiency Compton Suppression System for Automatic‐INAA

Abstract An automatic counting system for high counting efficiency and Compton suppression has been constructed. The system consists of a sample exchanger, a well‐type HPGe detector, a high count rate digital spectrometer (Dspec‐plus), a Compton suppression system and a software package. The detector for Compton suppression (BGO; Bi(GeO4)3) consists of eight segments, 140 mm in length and 35 mm in depth. The segments are arranged to surround the HPGe well‐detector (120 cc). A software package was also developed to facilitate automatic short‐time activation analysis and optimization of the counting procedure according to the activity of the analyzed samples, with or without compton suppression system (CSS). The counting system enables sensitive, dynamic and accurate analysis of different sample matrices and improves by means of CSS the detection limits two fold up to input count rates of 40 kcps.