title: An Internal Geiger Counter for the Assay of Low Specific Activity Samples of Carbon 14 and other Weak Beta Emitters in Biological Samples.
authors.forename: F E
authors.initials: FE
authors.lastname: Kelsey
mesh_terms: D001681:Biological Assay; D002250:Carbon Radioisotopes; D011851:Radioactivity; D011874:Radiometry
chemical_list: D002250:Carbon Radioisotopes