SEARCH Articles Figures Tables Abundance of naturally occurring isotopes Abundance ratio of isotopes Abundancy of isotopes Cosmic abundances of elements and isotopes Determination of Average Isotope Abundances in Organic Compounds Isotope abundances Isotope abundancies Isotopes isotopic abundance Isotopic abundances Natural Abundance of Important Isotopes Natural Abundances of the Elements and Isotope Variations Natural abundance of isotopes Natural abundance of the Isotopes Ratios of Isotopic Abundances Relative abundance of natural isotopes Relative abundance of naturally occurring isotopes Representation of Isotopic Abundances Solar system abundances of the isotopes