title: Coincidence counting of I-129; some remarks on the efficiency extrapolation technique in coincidence counting; a determination of the efficiency of a methane 4 pi-counter to 32 keV photons.
mesh_terms: D007457:Iodine Radioisotopes; D011874:Radiometry / Q000379:methods
chemical_list: D007457:Iodine Radioisotopes