Analysis of 26Al in meteorite samples by coincidence gamma-ray spectrometry

Large volume Ge-detectors have been used for the analysis of positron emitters of cosmogenic origin in extraterrestrial samples including lunar samples and meteorites. We present results from the analysis of ²⁶Al in the Rumanová chondrite which was found in 1994 in Slovakia. A slide of the meteorite was cut into ~1 cm³ cubes which were analyzed in a coincidence Ge–NaI(Tl) spectrometer placed in a large shield measuring 1.5 × 1.5 × 2 m³, and consisting of iron, lead and copper layers. Operational characteristics of the spectrometer are presented and discussed, as well as the ²⁶Al profile observed in the meteorite.