Abstract
Standardisation of 103Ru was carried out using a 4πβ(ppc)-γ(HPGe) coincidence apparatus permitting the computer discrimination method. The correct standardisation was achieved only by the accurate measurement of the coincidence efficiency function considering the effect of the 40-keV internal conversion electrons. The emission probabilities for the principal 497-, 557- and 610-keV γ-rays were determined to be 0.9147±0.0058, 0.0085±0.0001 and 0.0581±0.0005 from the disintegration rate and γ-ray measurements.
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