Abstract
Effects of inhomogeneities in thin 4πβ counting sources on the results of activity standardizations were investigated using 59Fe and 134Cs. The inhomogeneities were due to non-uniformities in the sizes of the crystallines of the radioactive salts composing the source deposits. The measurements were made with a new type of proportional counter permitting 4πβ (PC)-γ measurements of up to five sources simultaneously. The sources formed by the crystallines with non-uniform distribution in size tended to yield results deviating from a linear fit even at relatively high β counting efficiencies. Efficiency extrapolation based on coincidence counting results is at present the most accurate method for activity standardizations whenever this method is applicable. The present investigation could lead to further improvements.
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