Concentration of Uranium and Lead and the Isotopic Composition of Lead in Meteoritic Material

摘要: The cosmic abundance of lead and uranium have been determined by studying the contents meteoritic materials. Lead is found to be present 8\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}3}$ atom/10 000 atoms silicon, 1\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}4}$ atom silicon. new value for removes hump in curve 206-208 mass region. relative primordial abundances isotopes 204, 206, 207, 208 are 1:9.4:10.3:29.2, respectively.