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We have studied the -decays of 214Po into 210Pb and of 212Po into 208Pb tagged by the\udcoincidence with the preceding -decays from 214Bi and 212Bi, respectively. The 222Rn, 232Th, and\ud220Rn sources used were sealed inside quartz vials and inserted in the Counting Test Facility at the\udunderground Gran Sasso National Laboratory in Italy. We find that the mean lifetime of 214Po is\ud(236.00 ± 0.42(stat) ± 0.15(syst)) μs and that of 212Po is (425.1 ± 0.9(stat) ± 1.2(syst)) ns. Our results,\udobtained from data with signal-to-background ratio larger than 1000, reduce the overall uncertainties and\udare compatible with previous measurements

Lifetime measurements of 214Po and 212Po with the CTF liquid scintillator detector at LNGS