β Scribed by C. Ballaux; B.M. Coursey; D.D. Hoppes
No coin nor oath required. For personal study only.
techniques were used to establish the activity of solutions of '"'Cd. In one, the activity was derived from the sum of conversion-electron and ;'-ray emission rates from the 88.034-keV state of '"%Ag through which all decays pass. Conversion electrons were measured by both a liquid-scintillation counter and a 4n Si(Li) spectrometer. Gamma rays were measured with a NaI(TI) well crystal with a high and calculable efficiency. In the other method, liquid-scintillation counting was used to measure the activity of the analogue fi-particle-emitting radionuclide '09Pd to +0.41%, and :I-ray spectrometers were used to compare the emission rates from quantitative samples of '"'Pd and ?Zd. The half life of io9Pd was measured as (13.404 k 0.008) h, in agreement with an earlier result. For the 88.034-keV transition of '09m Ag, a total internal-conversion coefficient of 26.21 f 0.14 and a ;I-ray emission probability of (3.675 + 0.018)% were deduced.
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