title: Shortened lifetime for reference radiations?
authors.forename: Joseph C
authors.initials: JC
authors.lastname: McDonald
mesh_terms: D000818:Animals; D002138:Calibration; D002142:Californium / Q000592:standards / Q000600:supply & distribution; D002588:Cesium Radioisotopes / Q000600:supply & distribution / Q000627:therapeutic use; D006801:Humans; D011868:Radioisotopes / Q000592:standards / Q000600:supply & distribution / Q000627:therapeutic use; D011878:Radiotherapy / Q000592:standards; D012015:Reference Standards; D012449:Safety / Q000331:legislation & jurisprudence; D014481:United States
chemical_list: D002588:Cesium Radioisotopes; D011868:Radioisotopes; D002142:Californium