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The alpha decays of naturally occurring platinum isotopes, which areaccompanied by the emission of gamma quanta, have been searched for deepunderground (3600 m w.e.) in the Gran Sasso National Laboratories of the INFN(Italy). A sample of Pt with mass of 42.5 g and a natural isotopic compositionhas been measured with a low background HP Ge detector (468 cm^3) during 1815h. The alpha decay of 190-Pt to the first excited level of 186-Os (J^\pi = 2^+,E_{exc}=137.2 keV) has been observed for the first time, with the half-lifedetermined as: T_{1/2} = 2.6_{-0.3}^{+0.4} (stat.) \pm 0.6 (syst.) \times10^{14} yr. The T_{1/2} limits for the alpha decays of other Pt isotopes havebeen determined at level of T_{1/2} \simeq 10^{16}-10^{20} yr. These limitshave been set for the first time or they are better than those known fromearlier experiments.

First observation of alpha decay of 190-Pt to the first excited level (E_{exc}=137.2 keV) of 186-Os