Appendix M: Half-Lives for Several Radioactive Isotopes

Half-Lives for Several Radioactive Isotopes
Isotope Half-Life[1] Type of Emission[2] Isotope Half-Life[3] Type of Emission[4]
[latex]_6^{14}\text{C}[/latex] 5730 y [latex]({\beta}-)[/latex] [latex]_{83}^{210}\text{Bi}[/latex] 5.01 d [latex]({\beta}-)[/latex]
[latex]_7^{13}\text{N}[/latex] 9.97 m [latex]({\beta}+)[/latex] [latex]_{83}^{212}\text{Bi}[/latex] 60.55 m [latex]({\alpha}\;\text{or}\;{\beta}-)[/latex]
[latex]_9^{15}\text{F}[/latex] 4.1 × 10−22 s [latex](p)[/latex] [latex]_{84}^{210}\text{Po}[/latex] 138.4 d [latex]({\alpha})[/latex]
[latex]_{11}^{24}\text{Na}[/latex] 15.00 h [latex]({\beta}-)[/latex] [latex]_{84}^{212}\text{Po}[/latex] 3 × 10−7 s [latex]({\alpha})[/latex]
[latex]_{15}^{32}\text{P}[/latex] 14.29 d [latex]({\beta}-)[/latex] [latex]_{84}^{216}\text{Po}[/latex] 0.15 s [latex]({\alpha})[/latex]
[latex]_{19}^{40}\text{K}[/latex] 1.27 × 109 y [latex]({\beta}\;\text{or}\;E.C.)[/latex] [latex]_{84}^{218}\text{Po}[/latex] 3.05 m [latex]({\alpha})[/latex]
[latex]_{26}^{49}\text{Fe}[/latex] 0.08 s [latex]({\beta}+)[/latex] [latex]_{85}^{215}\text{At}[/latex] 1.0 × 10−4 s [latex]({\alpha})[/latex]
[latex]_{26}^{60}\text{Fe}[/latex] 2.6 × 106 y [latex]({\beta}-)[/latex] [latex]_{85}^{218}\text{At}[/latex] 1.6 s [latex]({\alpha})[/latex]
[latex]_{27}^{60}\text{Co}[/latex] 5.27 y [latex]({\beta}-)[/latex] [latex]_{86}^{220}\text{Rn}[/latex] 55.6 s [latex]({\alpha})[/latex]
[latex]_{37}^{87}\text{Rb}[/latex] 4.7 × 1010 y [latex]({\beta}-)[/latex] [latex]_{86}^{222}\text{Rn}[/latex] 3.82 d [latex]({\alpha})[/latex]
[latex]_{38}^{90}\text{Sr}[/latex] 29 y [latex]({\beta}-)[/latex] [latex]_{88}^{224}\text{Ra}[/latex] 3.66 d [latex]({\alpha})[/latex]
[latex]_{49}^{115}\text{In}[/latex] 5.1 × 1015 y [latex]({\beta}-)[/latex] [latex]_{88}^{226}\text{Ra}[/latex] 1600 y [latex]({\alpha})[/latex]
[latex]_{53}^{131}\text{I}[/latex] 8.040 d [latex]({\beta}-)[/latex] [latex]_{88}^{228}\text{Ra}[/latex] 5.75 y [latex]({\beta}-)[/latex]
[latex]_{58}^{142}\text{Ce}[/latex] 5 × 1015 y [latex]({\alpha})[/latex] [latex]_{89}^{228}\text{Ac}[/latex] 6.13 h [latex]({\beta}-)[/latex]
[latex]_{81}^{208}\text{Tl}[/latex] 3.07 m [latex]({\beta}-)[/latex] [latex]_{90}^{228}\text{Th}[/latex] 1.913 y [latex]({\alpha})[/latex]
[latex]_{82}^{210}\text{Pb}[/latex] 22.3 y [latex]({\beta}-)[/latex] [latex]_{90}^{232}\text{Th}[/latex] 1.4 × 1010 y [latex]({\alpha})[/latex]
[latex]_{82}^{212}\text{Pb}[/latex] 10.6 h [latex]({\beta}-)[/latex] [latex]_{90}^{233}\text{Th}[/latex] 22 m [latex]({\beta}-)[/latex]
[latex]_{82}^{214}\text{Pb}[/latex] 26.8 m [latex]({\beta}-)[/latex] [latex]_{90}^{234}\text{Th}[/latex] 24.10 d24.10 d [latex]({\beta}-)[/latex]
[latex]_{83}^{206}\text{Bi}[/latex] 6.243 d [latex](E.C.)[/latex] [latex]_{91}^{233}\text{Pa}[/latex] 27 d [latex]({\beta}-)[/latex]
[latex]_{92}^{233}\text{U}[/latex] 1.59 × 105 y [latex]({\alpha})[/latex] [latex]_{96}^{242}\text{Cm}[/latex] 162.8 d [latex]({\alpha})[/latex]
[latex]_{92}^{234}\text{U}[/latex] 2.45 × 105 y [latex]({\alpha})[/latex] [latex]_{97}^{243}\text{Bk}[/latex] 4.5 h [latex]({\alpha}\;\text{or}\;E.C.)[/latex]
[latex]_{92}^{235}\text{U}[/latex] 7.03 × 108 y [latex]({\alpha})[/latex] [latex]_{99}^{253}\text{Es}[/latex] 20.47 d [latex]({\alpha})[/latex]
[latex]_{92}^{238}\text{U}[/latex] 4.47 × 109 y [latex]({\alpha})[/latex] [latex]_{100}^{254}\text{Fm}[/latex] 3.24 h [latex]({\alpha}\;\text{or}\;S.F.)[/latex]
[latex]_{92}^{239}\text{U}[/latex] 23.54 m [latex]({\beta}-)[/latex] [latex]_{100}^{255}\text{Fm}[/latex] 20.1 h [latex]({\alpha})[/latex]
[latex]_{93}^{239}\text{Np}[/latex] 2.3 d [latex]({\beta}-)[/latex] [latex]_{101}^{256}\text{Md}[/latex] 76 m [latex]({\alpha}\;\text{or}\;E.C.)[/latex]
[latex]_{94}^{239}\text{Pu}[/latex] 2.407 × 104 y [latex]({\alpha})[/latex] [latex]_{102}^{254}\text{No}[/latex] 55 s [latex]({\alpha})[/latex]
[latex]_{94}^{239}\text{Pu}[/latex] 6.54 × 103 y [latex]({\alpha})[/latex] [latex]_{103}^{257}\text{Lr}[/latex] 0.65 s [latex]({\alpha})[/latex]
[latex]_{94}^{241}\text{Pu}[/latex] 14.4 y [latex]({\alpha}\;\text{or}\;{\beta}-)[/latex] [latex]_{105}^{260}\text{Ha}[/latex] 1.5 s [latex]({\alpha}\;\text{or}\;S.F.)[/latex]
[latex]_{95}^{241}\text{Am}[/latex] 432.2 y [latex]({\alpha})[/latex] [latex]_{106}^{263}\text{Sg}[/latex] 0.8 s [latex]({\alpha}\;\text{or}\;S.F.)[/latex]

  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