title: Low level tritium and carbon-14 determination.
mesh_terms: D001417:Background Radiation; D002247:Carbon Isotopes / Q000032:analysis*; D005069:Evaluation Studies as Topic; D007930:Leucine; D008239:Lysine; D008722:Methods; D011874:Radiometry / Q000295:instrumentation; D012588:Scintillation Counting; D014316:Tritium / Q000032:analysis*
chemical_list: D002247:Carbon Isotopes; D014316:Tritium; D007930:Leucine; D008239:Lysine