title: Automated calculation of carbon-14 and sulfur-35 radioactivity in biological samples by external standardization and a computer program.
mesh_terms: D001331:Automation; D002247:Carbon Isotopes; D003201:Computers; D008722:Methods; D011874:Radiometry; D013460:Sulfur Isotopes
chemical_list: D002247:Carbon Isotopes; D013460:Sulfur Isotopes