on 05-11-201704:39 AM - edited on 11-09-202104:15 AM by usermigration2
1) Department of Earth and Planetary Sciences, University of California, One Shields Avenue, Davis, California 95616, United States, 2) Research School of Earth Sciences, Australian National University, Canberra, Australia Analytical Chemistry (2013), V85, pp11258-11264, doi: 10.1021/ac401828w Precise Determination of the Lutetium Isotopic Composition in Rocks and Minerals Using Multicollector ICPMS Josh B. Wimpenny (1), Yuri Amelin (2) and Qing-Zhu Yin (1) Evidence of 176Hf excess in select meteorites older than 4556Ma was suggested to be caused by excitation of longlived natural radionuclide 176Lu to its short-lived isomer 176mLu, due to an irradiation event during accretion in the early solar system. A result of this process would be a deficit in 176Lu in irradiated samples by between 1‰ and 7‰. Previous measurements of the Lu isotope ratio in rock samples have not been of sufficient precision to resolve such a phenomenon. We present a new analytical technique designed to measure the 176Lu/175Lu isotope ratio in rock samples to a precision of ∼0.1‰ using a multicollector inductively coupled mass spectrometer (MC-ICPMS).