Application of multiparameter coincidence spectrometry using a Ge detectors array to neutron activation analysis

The method of multiparameter coincidence spectrometry based on γ–γ coincidence is widely used for the nuclear structure studies, because of its high sensitivity to γ-rays. In this study, feasibility of the method of multiparameter coincidence spectrometry for analytical chemistry was examined. Two reference igneous rock samples (JP-1, JB-1a) issued by the Geological Survey of Japan were irradiated at a research reactor, and the γ-rays from the radioisotopes produced via neutron capture reactions were measured using an array of 12 Ge detectors with BGO Compton suppressors, GEMINI. Simultaneously 24 elements were analyzed without chemical separation. The observed smallest component was Eu contained in JP-1 with abundance of 4 ppb.