The nuclei Zr-81 and Mo-85 with T-z = 1/2 have been reinvestigated via
their beta-delayed proton emissions with p-gamma coincidence measurem
ent. The half-life of Zr-81 has been measured to be 5.3 +/- 0.5 s, whi
ch agrees with one of the two previous values. For Mo-85, the measured
half-life is 3.2 +/- 0.2 s, which revises the previous value.