Half-Lives for Several Radioactive Isotopes

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Half-Lives for Several Radioactive Isotopes
Isotope Half-Life1 Type of Emission2 Isotope Half-Life3 Type of Emission4
\({}_{\phantom{\rule{0.5em}{0ex}}6}^{14}\text{C}\) 5730 y \(\left({\beta }^{\text{−}}\right)\) \({}_{\phantom{\rule{0.5em}{0ex}}83}^{210}\text{Bi}\) 5.01 d \(\left({\beta }^{\text{−}}\right)\)
\({}_{\phantom{\rule{0.5em}{0ex}}7}^{13}\text{N}\) 9.97 m \(\left({\beta }^{\text{+}}\right)\) \({}_{\phantom{\rule{0.5em}{0ex}}83}^{212}\text{Bi}\) 60.55 m \(\left(\alpha \phantom{\rule{0.2em}{0ex}}\text{or}\phantom{\rule{0.2em}{0ex}}{\beta }^{\text{−}}\right)\)
\({}_{\phantom{\rule{0.5em}{0ex}}9}^{15}\text{F}\) 4.1 \(×\) 10−22 s \(\left(p\right)\) \({}_{\phantom{\rule{0.5em}{0ex}}84}^{210}\text{Po}\) 138.4 d \(\left(\alpha \right)\)
\({}_{11}^{24}\text{Na}\) 15.00 h \(\left({\beta }^{\text{−}}\right)\) \({}_{\phantom{\rule{0.5em}{0ex}}84}^{212}\text{Po}\) 3 \(×\) 10−7 s \(\left(\alpha \right)\)
\({}_{15}^{32}\text{P}\) 14.29 d \(\left({\beta }^{\text{−}}\right)\) \({}_{\phantom{\rule{0.5em}{0ex}}84}^{216}\text{Po}\) 0.15 s \(\left(\alpha \right)\)
\({}_{19}^{40}\text{K}\) 1.27 \(×\) 109 y \(\left(\beta \phantom{\rule{0.2em}{0ex}}\text{or}\phantom{\rule{0.2em}{0ex}}E.C.\right)\) \({}_{\phantom{\rule{0.5em}{0ex}}84}^{218}\text{Po}\) 3.05 m \(\left(\alpha \right)\)
\({}_{26}^{49}\text{Fe}\) 0.08 s \(\left({\beta }^{\text{+}}\right)\) \({}_{\phantom{\rule{0.5em}{0ex}}85}^{215}\text{At}\) 1.0 \(×\) 10−4 s \(\left(\alpha \right)\)
\({}_{26}^{60}\text{Fe}\) 2.6 \(×\) 106 y \(\left({\beta }^{\text{−}}\right)\) \({}_{\phantom{\rule{0.5em}{0ex}}85}^{218}\text{At}\) 1.6 s \(\left(\alpha \right)\)
\({}_{27}^{60}\text{Co}\) 5.27 y \(\left({\beta }^{\text{−}}\right)\) \({}_{\phantom{\rule{0.5em}{0ex}}86}^{220}\text{Rn}\) 55.6 s \(\left(\alpha \right)\)
\({}_{37}^{87}\text{Rb}\) 4.7 \(×\) 1010 y \(\left({\beta }^{\text{−}}\right)\) \({}_{\phantom{\rule{0.5em}{0ex}}86}^{222}\text{Rn}\) 3.82 d \(\left(\alpha \right)\)
\({}_{38}^{90}\text{Sr}\) 29 y \(\left({\beta }^{\text{−}}\right)\) \({}_{\phantom{\rule{0.5em}{0ex}}88}^{224}\text{Ra}\) 3.66 d \(\left(\alpha \right)\)
\({}_{\phantom{\rule{0.5em}{0ex}}49}^{115}\text{In}\) 5.1 \(×\) 1015 y \(\left({\beta }^{\text{−}}\right)\) \({}_{\phantom{\rule{0.5em}{0ex}}88}^{226}\text{Ra}\) 1600 y \(\left(\alpha \right)\)
\({}_{\phantom{\rule{0.5em}{0ex}}53}^{131}\text{I}\) 8.040 d \(\left({\beta }^{\text{−}}\right)\) \({}_{\phantom{\rule{0.5em}{0ex}}88}^{228}\text{Ra}\) 5.75 y \(\left({\beta }^{\text{−}}\right)\)
\({}_{\phantom{\rule{0.5em}{0ex}}58}^{142}\text{Ce}\) 5 \(×\) 1015 y \(\left(\alpha \right)\) \({}_{\phantom{\rule{0.5em}{0ex}}89}^{228}\text{Ac}\) 6.13 h \(\left({\beta }^{\text{−}}\right)\)
\({}_{\phantom{\rule{0.5em}{0ex}}81}^{208}\text{Tl}\) 3.07 m \(\left({\beta }^{\text{−}}\right)\) \({}_{\phantom{\rule{0.5em}{0ex}}90}^{228}\text{Th}\) 1.913 y \(\left(\alpha \right)\)
\({}_{\phantom{\rule{0.5em}{0ex}}82}^{210}\text{Pb}\) 22.3 y \(\left({\beta }^{\text{−}}\right)\) \({}_{\phantom{\rule{0.5em}{0ex}}90}^{232}\text{Th}\) 1.4 \(×\) 1010 y \(\left(\alpha \right)\)
\({}_{\phantom{\rule{0.5em}{0ex}}82}^{212}\text{Pb}\) 10.6 h \(\left({\beta }^{\text{−}}\right)\) \({}_{\phantom{\rule{0.5em}{0ex}}90}^{233}\text{Th}\) 22 m \(\left({\beta }^{\text{−}}\right)\)
\({}_{\phantom{\rule{0.5em}{0ex}}82}^{214}\text{Pb}\) 26.8 m \(\left({\beta }^{\text{−}}\right)\) \({}_{\phantom{\rule{0.5em}{0ex}}90}^{234}\text{Th}\) \(\text{24.10 d}\) \(\left({\beta }^{\text{−}}\right)\)
\({}_{\phantom{\rule{0.5em}{0ex}}83}^{206}\text{Bi}\) 6.243 d \(\left(E.C.\right)\) \({}_{\phantom{\rule{0.5em}{0ex}}91}^{233}\text{Pa}\) 27 d \(\left({\beta }^{\text{−}}\right)\)
\({}_{\phantom{\rule{0.5em}{0ex}}92}^{233}\text{U}\) 1.59 \(×\) 105 y \(\left(\alpha \right)\) \({}_{\phantom{\rule{0.5em}{0ex}}96}^{242}\text{Cm}\) 162.8 d \(\left(\alpha \right)\)
\({}_{\phantom{\rule{0.5em}{0ex}}92}^{234}\text{U}\) 2.45 \(×\) 105 y \(\left(\alpha \right)\) \({}_{\phantom{\rule{0.5em}{0ex}}97}^{243}\text{Bk}\) 4.5 h \(\left(\alpha \phantom{\rule{0.2em}{0ex}}\text{or}\phantom{\rule{0.2em}{0ex}}E.C.\right)\)
\({}_{\phantom{\rule{0.5em}{0ex}}92}^{235}\text{U}\) 7.03 \(×\) 108 y \(\left(\alpha \right)\) \({}_{\phantom{\rule{0.5em}{0ex}}99}^{253}\text{Es}\) 20.47 d \(\left(\alpha \right)\)
\({}_{\phantom{\rule{0.5em}{0ex}}92}^{238}\text{U}\) 4.47 \(×\) 109 y \(\left(\alpha \right)\) \({}_{100}^{254}\text{Fm}\) 3.24 h \(\left(\alpha \phantom{\rule{0.2em}{0ex}}\text{or}\phantom{\rule{0.2em}{0ex}}S.F.\right)\)
\({}_{\phantom{\rule{0.5em}{0ex}}92}^{239}\text{U}\) 23.54 m \(\left({\beta }^{\text{−}}\right)\) \({}_{100}^{255}\text{Fm}\) 20.1 h \(\left(\alpha \right)\)
\({}_{\phantom{\rule{0.5em}{0ex}}93}^{239}\text{Np}\) 2.3 d \(\left({\beta }^{\text{−}}\right)\) \({}_{101}^{256}\text{Md}\) 76 m \(\left(\alpha \phantom{\rule{0.2em}{0ex}}\text{or}\phantom{\rule{0.2em}{0ex}}E.C.\right)\)
\({}_{\phantom{\rule{0.5em}{0ex}}94}^{239}\text{Pu}\) 2.407 \(×\) 104 y \(\left(\alpha \right)\) \({}_{102}^{254}\text{No}\) 55 s \(\left(\alpha \right)\)
\({}_{\phantom{\rule{0.5em}{0ex}}94}^{239}\text{Pu}\) 6.54 \(×\) 103 y \(\left(\alpha \right)\) \({}_{103}^{257}\text{Lr}\) 0.65 s \(\left(\alpha \right)\)
\({}_{\phantom{\rule{0.5em}{0ex}}94}^{241}\text{Pu}\) 14.4 y \(\left(\alpha \phantom{\rule{0.2em}{0ex}}\text{or}\phantom{\rule{0.2em}{0ex}}{\beta }^{\text{−}}\right)\) \({}_{105}^{260}\text{Ha}\) 1.5 s \(\left(\alpha \phantom{\rule{0.2em}{0ex}}\text{or}\phantom{\rule{0.2em}{0ex}}S.F.\right)\)
\({}_{\phantom{\rule{0.5em}{0ex}}95}^{241}\text{Am}\) 432.2 y \(\left(\alpha \right)\) \({}_{106}^{263}\text{Sg}\) 0.8 s \(\left(\alpha \phantom{\rule{0.2em}{0ex}}\text{or}\phantom{\rule{0.2em}{0ex}}S.F.\right)\)

Footnotes

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

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