Radiations from Platinum (193) and Gold (199)

The 4-day platinum activity, ${\mathrm{Pt}}^{193}$, was induced in metallic platinum irradiated by neutrons in the pile at Oak Ridge. This isotope was found to emit conversion electrons of energy 0.115 Mev and x-rays of energy 70 kev. Beta-gamma-coincidence measurements showed that the conversion electrons are coupled with little or no gamma-ray energy. Gamma-gamma-coincidences, probably gamma-(x-ray) coincidences, were found in ${\mathrm{Pt}}^{193}$.