title: Letter: Gain instability of scintillation detectors and consequences for dynamic tracer studies.
mesh_terms: D001417:Background Radiation; D011849:Radioactive Tracers; D011868:Radioisotopes; D012588:Scintillation Counting / Q000592:standards*
chemical_list: D011849:Radioactive Tracers; D011868:Radioisotopes