Decay of Ionium (Th230)

Abstract
Gamma-ray coincidence studies of the decay of ionium yield the total conversion coefficient of the 68-kev gamma ray as α=46±5, and a value of f=0.52±0.05 for the fluorescent yield from the L shell of Ra226. The mean lifetime of the 68-kev state of Ra226 was found to be T1e109 second.