Abstract
Three methods of standardizing 125I have been compared: (1) sum-peak coincidence counting with a Ge detector, (2) X-ray-X-ray coincidence counting, and (3) 4πe-X coincidence counting with efficiency extrapolation. The object of the study was to look for any evidence at the 0.1% level of systematic differences in the derived activity concentration. Enough data were accumulated to reduce the statistical uncertainties for methods (2) and (3) to 0.05%. It is concluded that systematic differences, if any, between the results of the methods are ≤ 0.2%.
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