South Africa's national radioactivity measurement standard is maintained at a satellite laboratory in Cape Town by the National Metrology Laboratory (NML) of the Council-for Scientific and Industrial Research. Standardizations are undertaken by a number of direct methods utilizing liquid scintillation counting (LSC). The successful application of LSC to the 4pibeta-gamma coincidence method is reviewed. The activity unit is maintained through radionuclide specific calibration factors relating to a pressurized re-entrant well type ionization chamber. A comparison is made between normalized factors given by the manufacturer and deduced factors obtained by a method used to transfer calibration factors from the International Reference System of the International Bureau of Weights and Measures based on the NML's own absolute standardizations.
Reference:
Simpson, BRS. 2001. Radioactivity standardization in South Africa. Applied Radiation and Isotopes, vol. 56, 02 January, pp 301-305
Simpson, B. (2002). Radioactivity standardization in South Africa. http://hdl.handle.net/10204/1627
Simpson, BRS "Radioactivity standardization in South Africa." (2002) http://hdl.handle.net/10204/1627
Simpson B. Radioactivity standardization in South Africa. 2002; http://hdl.handle.net/10204/1627.
