Absolute activity measurement of the electron-capture-based radionuclides 139Ce, 125I, 192Ir and 65Zn by liquid scintillation coincidence counting.
Four radionuclides with electron-capture-based decay schemes have been directly measured by a liquid scintillation coincidence extrapolation technique. 125I, 192Ir and 65Zn were measured as part of international key comparisons held under the auspices of the International Bureau of Weights and Measures (BIPM). The 139Ce measurements formed part of a regional comparison organized by the Asia Pacific Metrology Programme (APMP). Since 139Ce decays purely by electron-capture, the basic method is described for this radionuclide. Results and difficulties encountered are discussed and uncertainty budgets are presented.
Radioactivity Standards Laboratory, CSIR NML, 15 Lower Hope Road, Rosebank 7700, Cape Town, South Africa. FvWyngaardt@csir.co.za
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WM
Van Wyngaardt
B R S
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Simpson
D000465:Algorithms; D002588:Cesium Radioisotopes / Q000032:analysis / Q000737:chemistry; D003198:Computer Simulation; D004583:Electrons; D007457:Iodine Radioisotopes / Q000032:analysis / Q000737:chemistry; D007495:Iridium / Q000032:analysis / Q000737:chemistry; D008956:Models, Chemical; D011829:Radiation Dosage; D011868:Radioisotopes / Q000032:analysis* / Q000737:chemistry; D012588:Scintillation Counting / Q000379:methods*; D012984:Software; D012996:Solutions; D015037:Zinc Radioisotopes / Q000032:analysis / Q000737:chemistry
D002588:Cesium Radioisotopes; D007457:Iodine Radioisotopes; D011868:Radioisotopes; D012996:Solutions; D015037:Zinc Radioisotopes; D007495:Iridium