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The isotope 178 Tl was produced in a bombardment of 102 Pd by 78 Kr ions at 340 MeV. Reaction products were separated from the beam by the Berkeley Gas-Filled Separator, and implanted into a silicon strip detector where the subsequent ␣ decays were measured. Four distinct ␣ transitions from 178 Tl were observed correlated to 6.54 MeV ␣ decays from the previously known 174 Au daughter. In some cases, the 174 Au decay was followed by a 5.815-MeV ␣ decay. This new transition is tentatively assigned to the decay of the 170 Ir ground state. The half-life of 178 Tl was measured to be 254 Ϫ9 ϩ11 ms. The ␣ decay branch of 174 Au was determined to be 90͑6͒%.

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