Influence of radioactive impurities on SIR measurements
The correction usually applied to an SIR measurement in the presence of a gamma-ray emitting impurity is presented and explained. The method of calibration of a Ge(Li) spectrometer is briefly described. It is used to look for impurities when SIR measurements show inconsistencies. An example is presented where a 103Ru impurity was discovered in a 99Mo solution. The correction applied compensates for the decrease of around 0.2% per day observed in the SIR measurements of this 99Mo ampoule.
Michotte
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Bureau International des Poids et Mesures (BIPM), Sevres, France.