title: Absolute measurement of total-body calcium by the Ar-37 method-preliminary results: concise communication.
abstract: Measurements of exhaled Ar-37 produced by total-body neutron irradiation of Ca-40, were used to determine total-body calcium in ten human subjects. There was a good correlation between the Ar-37 yield and total-body calcium determined by measurement of Ca-49.
mesh_terms: D000328:Adult; D000368:Aged; D001128:Argon / Q000032:analysis; D001823:Body Composition; D002118:Calcium / Q000032:analysis*; D006801:Humans; D008875:Middle Aged; D009501:Neutron Activation Analysis; D011868:Radioisotopes / Q000032:analysis; D012119:Respiration
chemical_list: D011868:Radioisotopes; D001128:Argon; D002118:Calcium