title: Lifetimes of (214)Po and (212)Po measured with Counting Test Facility at Gran Sasso National Laboratory.
abstract: The decays of (214)Po into (210)Pb and of (212)Po into (208)Pb tagged by the previous decays from (214)Bi and (212)Bi have been studied inserting quartz vials inside the Counting Test Facility (CTF) at the underground laboratory in Gran Sasso (LNGS). We find that the mean lifetime of (214)Po is (236.00 ± 0.42(stat) ± 0.15(syst)) μs and that of (212)Po is (425.1 ± 0.9(stat) ± 1.2(syst)) ns. Our results are compatible with previous measurements, have a much better signal to background ratio, and reduce the overall uncertainties.
authors.affiliation: Dipartimento di Fisica, Università degli Studi e INFN, Milano 20133, Italy.
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mesh_terms: D000512:Alpha Particles; D006207:Half-Life; D007753:Laboratories; D007856:Lead Radioisotopes / Q000032:analysis*; D011059:Polonium / Q000032:analysis*; D011834:Radiation Monitoring; D011848:Radioactive Pollutants / Q000032:analysis*
chemical_list: D007856:Lead Radioisotopes; D011848:Radioactive Pollutants; D011059:Polonium
keywords: Alfa-decay lifetime; Bi–Po coincidence; Natural radioactivity; Po-212; Po-214