Simpson, BRSMorris, WM2007-02-082007-06-072007-02-082007-06-072004-02Simpson, BRS and Morris, WM. 2004. Direct activity determination of Mn-54 and Zn-65 by a non-extrapolation liquid scintillation method. Applied Radiation and Isotopes, vol. 60, 04 February, pp 475-4790969-8043http://hdl.handle.net/10204/1629http://hdl.handle.net/10204/1629The measurement of Mn-54 and Zn-65 by liquid scintillation coincidence counting results in low detection efficiencies. The activity obtained from the extrapolation of efficiency data can therefore become problematic if curvature is present. The simple decay scheme exhibited by these radionuclides, with the emission of an energetic gamma ray, allows the absolute activity to be determined from 4pie-gamma data by direct calculation without the need for efficiency extrapolation. The method, which relies on determining the probability of the gamma-ray interacting with the scintillator solution, is described and validated by measurements made on Co-60194147 bytesapplication/pdfenCopyright: 2004 Pergamon-Elsevier Science LtdLiquid scintillation coincidence countingGamma-ray interaction probabilityChemistryMn-54Zn-65ArticleSimpson, B., & Morris, W. (2004). Direct activity determination of Mn-54 and Zn-65 by a non-extrapolation liquid scintillation method. http://hdl.handle.net/10204/1629Simpson, BRS, and WM Morris "Direct activity determination of Mn-54 and Zn-65 by a non-extrapolation liquid scintillation method." (2004) http://hdl.handle.net/10204/1629Simpson B, Morris W. Direct activity determination of Mn-54 and Zn-65 by a non-extrapolation liquid scintillation method. 2004; http://hdl.handle.net/10204/1629.TY - Article AU - Simpson, BRS AU - Morris, WM AB - The measurement of Mn-54 and Zn-65 by liquid scintillation coincidence counting results in low detection efficiencies. The activity obtained from the extrapolation of efficiency data can therefore become problematic if curvature is present. The simple decay scheme exhibited by these radionuclides, with the emission of an energetic gamma ray, allows the absolute activity to be determined from 4pie-gamma data by direct calculation without the need for efficiency extrapolation. The method, which relies on determining the probability of the gamma-ray interacting with the scintillator solution, is described and validated by measurements made on Co-60 DA - 2004-02 DB - ResearchSpace DP - CSIR KW - Liquid scintillation coincidence counting KW - Gamma-ray interaction probability KW - Chemistry KW - Mn-54 KW - Zn-65 LK - https://researchspace.csir.co.za PY - 2004 SM - 0969-8043 T1 - Direct activity determination of Mn-54 and Zn-65 by a non-extrapolation liquid scintillation method TI - Direct activity determination of Mn-54 and Zn-65 by a non-extrapolation liquid scintillation method UR - http://hdl.handle.net/10204/1629 ER -