Nuclear Data Sheets for A=212

The half-life of $$^{212}$$Po

“…Treating all the listed in Table 4 uncertainties as independent and adding them in quadrature, we obtain the following half-life of 212 Po: The present measurement is the most accurate determination of the 212 Po half-life. The value is in agreement with the preliminary result of the previous stage of the present experiment T 1/2 = 294.8 (19) ns [17] and with the recommended value T 1/2 = 294.3(8) ns [1]. The result agrees with the recent experiments: T 1/2 = (294.7 ± 0.6(stat.)…”

“…Considering the data in Table 1, the liquid scintillator loaded with Th radionuclides appears a very promising way to reduce the 212 Po half-life uncertainty. However, although the measurements performed by the Borexino collaboration have profited of a fast scintillation signal, the measurement's [1]. The α transition of 212 Bi to 208 Tl is shown too [2].…”

“…1. The current recommended value of the 212 Po half-life is T 1/2 = 294.3 (8) ns [1]. The history of the 212 Po half-life measurements is presented in Table 1.…”

“…[19][20][21][22][23][24][25] as a by-product of the BiPo subchain analysis for different purposes (estimation of lowcounting detectors' internal contamination by thorium, calibration of detectors, study of low-lying states in α-decaying nuclei). Typically the results are affected by large statistical uncertainties up to 17% 1 , and the systematic effects were not evaluated. Much larger statistics was gathered in recent measurement [26] where an external Th source was placed between plastic scintillators viewed by a photomultiplier (PMT) obtaining T 1/2 = 294.09 (7) ns.…”

KATRIN background due to surface radioimpurities

“…The decay chain of 223 Ra includes four 𝛼-decays [17][18][19][20]. The 228 Th decay chain includes five 𝛼-decays [21][22][23][24][25]. The principal decay paths are shown in Eqs.…”