Fine structure in the a decay of Po-192 has been observed leading to t
he identification of an excited O+ state in Pb-188, at 571 (31) keV. T
he half-life of Po-192 has been determined precisely to be 33.2 (14) m
s and the alpha-branching ratio of the daughter Pb-188 has been deduce
d to be 0.085 (13).