Measurements of isotope ratios in meteorite samples using neutron activation analysis with multiparameter coincidence method

Hatsukawa, Yuichi; Miyamoto, Yutaka   ; Osawa, Takahito  ; Toh, Yosuke   ; Kimura, Atsushi   ; Oshima, Masumi

We developed a new technique of trace element analysis based on neutron activation analysis with coincident -ray detection. In order to improve the low efficiency of coincident -ray detection, an array of 16 Ge detectors with BGO Compton suppressors was used for this method. In this study, we try to measure trace elements in presolar grains. Presolar grains are synthesis in the Super nova or Red giant, and found in the primitive meteorite. We obtained nanodiamonds as presolar grains from the Allende meteorite, and try to measure trace elements in the grains using this method. We also measured isotope ratios of some elements in meteorite samples, such as presolar grains, chondrules.