18O

18O

Medical dictionary. 2011.

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  • Isotopes of oxygen — Late in a massive star s life, 16O concentrates in the O shell, 17O in the H shell and 18O in the He shell There are three stable isotopes of oxygen that lead to oxygen (O) having a standard atomic mass of 15.9994(3) u. 17 radioactive isotopes… …   Wikipedia

  • Δ18O — In geochemistry, paleoclimatology and paleoceanography δ18O is a measure of the ratio of stable isotopes 18O:16O. The definition is δ18O (in per mil) = 103 [(Rsample/Rstandard) 1] , where Rx = (18O)/(16O) is the ratio of isotopic composition of a …   Wikipedia

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