title: Thorium-229 as an isotopic tracer for the radiochemical determination of thorium isotopes in biological samples.
mesh_terms: D000818:Animals; D002417:Cattle; D006207:Half-Life; D006801:Humans; D008099:Liver / Q000032:analysis; D008168:Lung / Q000032:analysis; D011854:Radiochemistry; D013910:Thorium / Q000032:analysis*
chemical_list: D013910:Thorium