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M agn etism C arn egie Institution of 5241 Broad Branch Road, N .W ., Washington, D.C. 20015, U.S.A. 10Be, a cosmogenic isotope produced by cosmic rays interacting w ith the E a rth 's atm osphere and surface, has chem ical and physical properties th a t m ake it useful as a tracer for some terrestrial processes and a geological clock for a few substances. T he rarity of the stable isotope, 9Be, allows 10Be to be detected in n a tu ra l m aterials at extrem ely low levels w ith backgrounds fordoi:10.1098/rsta.1987.0073 fatcat:gu6n25qpgzasfdrr6ikuorl5ee