title: Selection of calcium isotopes for secondary ion mass spectrometric analysis of biological material.
abstract: The use of stable isotopes as tracers for elemental localization is a function of the background count rate which is dependent upon both the natural abundance and the quantity of interferences at the nominal mass. The occurrence of a variable and unpredictable high background count rate at mass 44+ in biological tissue, probably CO2+, limits the usefulness of this isotope for physiological problems.
mesh_terms: D000818:Animals; D002024:Bufo marinus; D002127:Calcium Isotopes; D007908:Lens, Crystalline / Q000032:analysis; D013058:Mass Spectrometry
chemical_list: D002127:Calcium Isotopes