title: Accuracy of external standardization systems in two commercially available spectrometers using gamma sources of high or low energy.
mesh_terms: D002250:Carbon Radioisotopes / Q000032:analysis*; D002587:Cesium Isotopes; D003201:Computers; D005069:Evaluation Studies as Topic; D005898:Glass; D008722:Methods; D011095:Polyethylenes; D011868:Radioisotopes; D011883:Radium; D012588:Scintillation Counting / Q000592:standards*; D014316:Tritium / Q000032:analysis*
chemical_list: D002250:Carbon Radioisotopes; D002587:Cesium Isotopes; D011095:Polyethylenes; D011868:Radioisotopes; D014316:Tritium; D011883:Radium