Appendix: Half-Lives for Several Radioactive Isotopes

IsotopeHalf-Life1Type of Emission2IsotopeHalf-Life3Type of Emission4
$_6^{14}C$5730 y$(β^−)$$_{83}^{210}Bi$5.01 d$(β^−)$
$_7^{13}N$9.97 m$(β^+)$$_{83}^{212}Bi$60.55 m$(α\;or\;β^−)$
$_9^{15}F$$4.1×10^{−22}\;s$$(p)$$_{84}^{210}Po$138.4 d$(α)$
$_{11}^{24}Na$15.00 h$(β^−)$$_{84}^{212}Po$$3×10^{−7}\;s$$(α)$
$_{15}^{32}P$14.29 d$(β^−)$$_{84}{216}Po$0.15 s$(α)$
$_{19}^{40}K$$1.27×10^9$ y$(β\;or\;E.C.)$$_{84}{218}Po$3.05 m$(α)$
$_{26}^{49}Fe$0.08 s$(β^+)$$_{85}^{215}At$$1.0×10^{−4}\;s$$(α)$
$_{26}^{60}Fe$$2.6×10^6$ y$(β^−)$$_{85}^{218}At$1.6 s$(α)$
$_{27}^{60}Co$5.27 y$(β^−)$$_{86}^{220}Rn$55.6 s$(α)$
$_{37}^{87}Rb$$4.7×10^{10}$ y$(β^−)$$_{86}^{222}Rn$3.82 d$(α)$
$_{38}^{90}Sr$29 y$(β^−)$$_{88}^{224}Ra$3.66 d$(α)$
$_{49}^{115}In$$5.1×10^{15}$ y$(β^−)$$_{88}^{226}Ra$1600 y$(α)$
$_{53}^{131}I$8.040 d$(β^−)$$_{88}^{228}Ra$5.75 y$(β^−)$
$_{58}^{142}Ce$$5×10^{15}$ y$(α)$$_{89}^{228}Ac$6.13 h$(β^−)$
$_{81}^{208}Tl$3.07 m$(β^−)$$_{90}^{228}Th$1.913 y$(α)$
$_{82}^{210}Pb$22.3 y$(β^−)$$_{90}^{232}Th$$1.4×10^{10}$ y$(α)$
$_{82}^{212}Pb$10.6 h$(β^−)$$_{90}^{233}Th$22 m$(β^−)$
$_{82}^{214}Pb$26.8 m$(β^−)$$_{90}^{234}Th$24.10 d$(β^−)$
$_{83}^{206}Bi$6.243 d$(E.C.)$$_{91}^{233}Pa$27 d$(β^−)$
$_{92}^{233}U$$1.59×10^5$ y$(α)$$_{96}^{242}Cm$162.8 d$(α)$
$_{92}^{234}U$$2.45×10^5$ y$(α)$$_{97}^{243}Bk$4.5 h$(α\;or\;E.C.)$
$_{92}^{235}U$$7.03×10^8$ y$(α)$$_{99}^{253}Es$20.47 d$(α)$
$_{92}^{238}U$$4.47×10^9$ y$(α)$$_{100}^{254}Fm$3.24 h$(α\;or\;S.F.)$
$_{92}^{239}U$23.54 m$(β^−)$$_{100}^{255}Fm$20.1 h$(α)$
$_{93}^{239}Np$2.3 d$(β^−)$$_{101}^{256}Md$76 m($α\;or\;E.C.)$
$_{94}^{239}Pu$$2.407×10^4\;y$$(α)$$_{102}^{254}No$55 s$(α)$
$_{94}^{239}Pu$$6.54×10^3\;y$$(α)$$_{103}^{257}Lr$0.65 s$(α)$
$_{94}^{241}Pu$14.4 y$(α\;or\;β^−)$$_{105}^{260}Ha$1.5 s$(α\;or\;S.F.)$
$_{95}^{241}Am$432.2 y$(α)$$_{106}^{263}Sg$0.8 s$(α\;or\;S.F.)$

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