Analyses of radionuclides in the Oued Awlitis 001 and Galb Inal lunar meteorites by HPGe gamma-ray spectrometry

摘要

Highly sensitive nondestructive HPGe gamma-ray spectrometry was used for the analysis of the cosmogenic (Al-26) and primordial (K-40, U-238, and Th-232) radionuclides in the Oued Awlitis 001 and Galb Inal lunar meteorites. The measured Al-26 activities were very different (84.0 +/- 4.8 dpm/kg vs. 8.4 +/- 1.2 dpm/kg, respectively), mainly because of different cosmic-ray exposure ages of the investigated meteorites. The pre-atmospheric radii were 5 +/- 1 cm and 11 +/- 2 cm, respectively, which would result in total pre-atmospheric masses in the range of 0.7-2.5 kg and 7-23 kg, respectively.