Abstract
Freeze-drying has been used routinely for preparing low energy beta sources. The sources have a better distribution of active material then those prepared by heat or air drying and result in far less self absorption. The inherent self-absorption is estimated by an extrapolation method. Confidence limits of 1%, 2% and 4% are placed on determinations of specific activity of 60Co, 35S and 63Ni respectively. Extension of the method to alpha sources and to spontaneous fission sources has also given good results.
Published Version
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