Standardisation of (89)Sr using three different methods
Three independent methods were used to standardise a (89)Sr solution in the frame of an international comparison organised by BIPM : 4p liquid scintillation (LS) spectrometry, based on the CIEMATINIST efficiency tracing, and direct activity measurements with a windowless 4p -CsI(Tl)-sandwich spectrometer and a 4p pressurised gas proportional counter. Quantitative solid point-like sources were prepared paying special attention during the source drying phase. The impurities in the original solution were measured and corrected for in the results of all three methods. The weighted mean' value of the activity concentration of (89)Sr was found to be 26.21 0.08 kBq g(-l). The half-life of (89)Sr was 50.61 0.05 days as determined from the LS measurements. The measurement methods, including the impurity measurements, are described and the results compared, considering the advantages and disadvantages of each method.
Bibliographic Reference: An oral report given at: ICRM 2001, 13th International Conference on Radionuclide Metrology and its Applications. Organised by: ICRM and PTB. Held in: Braunschweig (DE), 14-18 May, 2001
Record Number: 200013490 / Last updated on: 2001-07-24
Original language: en
Available languages: en