کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1877876 | 1042256 | 2011 | 5 صفحه PDF | دانلود رایگان |
A standard of 210Pb in solution was produced at the National Physical Laboratory by a novel technique combining Čerenkov counting with the established liquid scintillation efficiency tracing technique known as the CIEMAT/NIST method. Coincidence counting was applied in order to validate the measurements and the activity concentrations of the solution determined with each technique are shown to be in agreement. Radiochemical separation of the 210Pb from its daughters was also necessary and the scheme for the separation is described. After performing this two-stage standardisation, the uncertainty was successfully lowered to 0.66% (k=1). This uncertainty is approximately a factor of four lower than previously achieved at NPL by the classical method of standardisation of radionuclides, i.e. coincidence counting.
Journal: Applied Radiation and Isotopes - Volume 69, Issue 5, May 2011, Pages 768–772