Chemistry

# M | Half-Lives for Several Radioactive Isotopes

ChemistryM | Half-Lives for Several Radioactive Isotopes
Half-Lives for Several Radioactive Isotopes
Isotope Half-Life1 Type of Emission2 Isotope Half-Life3 Type of Emission4
$614C614C$ 5730 y $(β−)(β−)$ $83210Bi83210Bi$ 5.01 d $(β−)(β−)$
$713N713N$ 9.97 m $(β+)(β+)$ $83212Bi83212Bi$ 60.55 m $(αorβ−)(αorβ−)$
$915F915F$ 4.1 $××$ 10−22 s $(p)(p)$ $84210Po84210Po$ 138.4 d $(α)(α)$
$1124Na1124Na$ 15.00 h $(β−)(β−)$ $84212Po84212Po$ 3 $××$ 10−7 s $(α)(α)$
$1532P1532P$ 14.29 d $(β−)(β−)$ $84216Po84216Po$ 0.15 s $(α)(α)$
$1940K1940K$ 1.27 $××$ 109 y $(βorE.C.)(βorE.C.)$ $84218Po84218Po$ 3.05 m $(α)(α)$
$2649Fe2649Fe$ 0.08 s $(β+)(β+)$ $85215At85215At$ 1.0 $××$ 10−4 s $(α)(α)$
$2660Fe2660Fe$ 2.6 $××$ 106 y $(β−)(β−)$ $85218At85218At$ 1.6 s $(α)(α)$
$2760Co2760Co$ 5.27 y $(β−)(β−)$ $86220Rn86220Rn$ 55.6 s $(α)(α)$
$3787Rb3787Rb$ 4.7 $××$ 1010 y $(β−)(β−)$ $86222Rn86222Rn$ 3.82 d $(α)(α)$
$3890Sr3890Sr$ 29 y $(β−)(β−)$ $88224Ra88224Ra$ 3.66 d $(α)(α)$
$49115In49115In$ 5.1 $××$ 1015 y $(β−)(β−)$ $88226Ra88226Ra$ 1600 y $(α)(α)$
$53131I53131I$ 8.040 d $(β−)(β−)$ $88228Ra88228Ra$ 5.75 y $(β−)(β−)$
$58142Ce58142Ce$ 5 $××$ 1015 y $(α)(α)$ $89228Ac89228Ac$ 6.13 h $(β−)(β−)$
$81208Tl81208Tl$ 3.07 m $(β−)(β−)$ $90228Th90228Th$ 1.913 y $(α)(α)$
$82210Pb82210Pb$ 22.3 y $(β−)(β−)$ $90232Th90232Th$ 1.4 $××$ 1010 y $(α)(α)$
$82212Pb82212Pb$ 10.6 h $(β−)(β−)$ $90233Th90233Th$ 22 m $(β−)(β−)$
$82214Pb82214Pb$ 26.8 m $(β−)(β−)$ $90234Th90234Th$ $24.10 d24.10 d$ $(β−)(β−)$
$83206Bi83206Bi$ 6.243 d $(E.C.)(E.C.)$ $91233Pa91233Pa$ 27 d $(β−)(β−)$
$92233U92233U$ 1.59 $××$ 105 y $(α)(α)$ $96242Cm96242Cm$ 162.8 d $(α)(α)$
$92234U92234U$ 2.45 $××$ 105 y $(α)(α)$ $97243Bk97243Bk$ 4.5 h $(αorE.C.)(αorE.C.)$
$92235U92235U$ 7.03 $××$ 108 y $(α)(α)$ $99253Es99253Es$ 20.47 d $(α)(α)$
$92238U92238U$ 4.47 $××$ 109 y $(α)(α)$ $100254Fm100254Fm$ 3.24 h $(αorS.F.)(αorS.F.)$
$92239U92239U$ 23.54 m $(β−)(β−)$ $100255Fm100255Fm$ 20.1 h $(α)(α)$
$93239Np93239Np$ 2.3 d $(β−)(β−)$ $101256Md101256Md$ 76 m $(αorE.C.)(αorE.C.)$
$94239Pu94239Pu$ 2.407 $××$ 104 y $(α)(α)$ $102254No102254No$ 55 s $(α)(α)$
$94239Pu94239Pu$ 6.54 $××$ 103 y $(α)(α)$ $103257Lr103257Lr$ 0.65 s $(α)(α)$
$94241Pu94241Pu$ 14.4 y $(αorβ−)(αorβ−)$ $105260Ha105260Ha$ 1.5 s $(αorS.F.)(αorS.F.)$
$95241Am95241Am$ 432.2 y $(α)(α)$ $106263Sg106263Sg$ 0.8 s $(αorS.F.)(αorS.F.)$
Table M1

### Footnotes

• 1 y = years, d = days, h = hours, m = minutes, s = seconds
• 2 E.C. = electron capture, S.F. = Spontaneous fission
• 3 y = years, d = days, h = hours, m = minutes, s = seconds
• 4 E.C. = electron capture, S.F. = Spontaneous fission

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