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

  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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