More on Ru Endemic Isotope Anomalies in Meteorites

摘要: We reported last year on endemic isotope anomalies for Ru in iron meteorites, pallasites, ordinary chondrites, and a whole-rock sample of Allende. have extended the measurements to more refractory Ca-Al-rich inclusions (CAI) from Allende, whole rock Murchison (CM2). In companion abstract we report new Mo isotopes, some same samples. There has been renewed interest searching this nuclide region, as include many isotopes r-, s-, p-process nucleosynhesis. Furthermore, show atypically high abundances, which hard explain through standard nucleosynthetic processes. Effects are possible Ru-98 Ru-99 Tc-98 (with poorly known t(sub 1/2)=4.2 10Ma) Tc-99 (t(sub 1/2)=0.21Ma). Natural Tc is now extinct Earth due short half-lives, but may present early solar system. Both radiogenic general important understanding processes formation The current emphasis also result development Negative-ion Thermal Ionization Mass Spectrometry Multiple-Collector, Inductively-Coupled-Mass-Spectrometry. developed specific chemical siparation techniques Ru, eliminated mass interference effects.