# N1: Half-Lives for Several Radioactive Isotopes


Isotope Half-Life1 Type of Emission2 Isotope Half-Life3 Type of Emission4
$$\ce{^{14}_6C}$$ 5730 y $$(β^−)$$ $$\ce{^{210}_{83}Bi}$$ 5.01 d $$(β^−)$$
$$\ce{^{13}_7N}$$ 9.97 m $$(β^+)$$ $$\ce{^{212}_{83}Bi}$$ 60.55 m $$(α\textrm{ or }β^−)$$
$$\ce{^{15}_9F}$$ 4.1 × 10−22 s $$(p)$$ $$\ce{^{210}_{84}Po}$$ 138.4 d $$(α)$$
$$\ce{^{24}_{11}Na}$$ 15.00 h $$(β^−)$$ $$\ce{^{212}_{84}Po}$$ 3 × 10−7 s $$(α)$$
$$\ce{^{32}_{15}P}$$ 14.29 d $$(β^−)$$ $$\ce{^{216}_{84}Po}$$ 0.15 s $$(α)$$
$$\ce{^{40}_{19}K}$$ 1.27 × 109 y $$(β\textrm{ or }E.C.)$$ $$\ce{^{218}_{84}Po}$$ 3.05 m $$(α)$$
$$\ce{^{49}_{26}Fe}$$ 0.08 s $$(β^+)$$ $$\ce{^{215}_{85}At}$$ 1.0 × 10−4 s $$(α)$$
$$\ce{^{60}_{26}Fe}$$ 2.6 × 106 y $$(β^−)$$ $$\ce{^{218}_{85}At}$$ 1.6 s $$(α)$$
$$\ce{^{60}_{27}Co}$$ 5.27 y $$(β^−)$$ $$\ce{^{220}_{86}Rn}$$ 55.6 s $$(α)$$
$$\ce{^{87}_{37}Rb}$$ 4.7 × 1010 y $$(β^−)$$ $$\ce{^{222}_{86}Rn}$$ 3.82 d $$(α)$$
$$\ce{^{90}_{38}Sr}$$ 29 y $$(β^−)$$ $$\ce{^{224}_{88}Ra}$$ 3.66 d $$(α)$$
$$\ce{^{115}_{49}In}$$ 5.1 × 1015 y $$(β^−)$$ $$\ce{^{226}_{88}Ra}$$ 1600 y $$(α)$$
$$\ce{^{131}_{53}I}$$ 8.040 d $$(β^−)$$ $$\ce{^{228}_{88}Ra}$$ 5.75 y $$(β^−)$$
$$\ce{^{142}_{58}Ce}$$ 5 × 1015 y $$(α)$$ $$\ce{^{228}_{89}Ac}$$ 6.13 h $$(β^−)$$
$$\ce{^{208}_{81}Tl}$$ 3.07 m $$(β^−)$$ $$\ce{^{228}_{90}Th}$$ 1.913 y $$(α)$$
$$\ce{^{210}_{82}Pb}$$ 22.3 y $$(β^−)$$ $$\ce{^{232}_{90}Th}$$ 1.4 × 1010 y $$(α)$$
$$\ce{^{212}_{82}Pb}$$ 10.6 h $$(β^−)$$ $$\ce{^{233}_{90}Th}$$ 22 m $$(β^−)$$
$$\ce{^{214}_{82}Pb}$$ 26.8 m $$(β^−)$$ $$\ce{^{234}_{90}Th}$$ 24.10 d $$(β^−)$$
$$\ce{^{206}_{83}Bi}$$ 6.243 d $$(E.C.)$$ $$\ce{^{233}_{91}Pa}$$ 27 d $$(β^−)$$
$$\ce{^{233}_{92}U}$$ 1.59 × 105 y $$(α)$$ $$\ce{^{242}_{96}Cm}$$ 162.8 d $$(α)$$
$$\ce{^{234}_{92}U}$$ 2.45 × 105 y $$(α)$$ $$\ce{^{243}_{97}Bk}$$ 4.5 h $$(α\textrm{ or }E.C.)$$
$$\ce{^{235}_{92}U}$$ 7.03 × 108 y $$(α)$$ $$\ce{^{253}_{99}Es}$$ 20.47 d $$(α)$$
$$\ce{^{238}_{92}U}$$ 4.47 × 109 y $$(α)$$ $$\ce{^{254}_{100}Fm}$$ 3.24 h $$(α\textrm{ or }S.F.)$$
$$\ce{^{239}_{92}U}$$ 23.54 m $$(β^−)$$ $$\ce{^{255}_{100}Fm}$$ 20.1 h $$(α)$$
$$\ce{^{239}_{93}Np}$$ 2.3 d $$(β^−)$$ $$\ce{^{256}_{101}Md}$$ 76 m $$(α\textrm{ or }E.C.)$$
$$\ce{^{239}_{94}Pu}$$ 2.407 × 104 y $$(α)$$ $$\ce{^{254}_{102}No}$$ 55 s $$(α)$$
$$\ce{^{239}_{94}Pu}$$ 6.54 × 103 y $$(α)$$ $$\ce{^{257}_{103}Lr}$$ 0.65 s $$(α)$$
$$\ce{^{241}_{94}Pu}$$ 14.4 y $$(α\textrm{ or }β^−)$$ $$\ce{^{260}_{105}Ha}$$ 1.5 s $$(α\textrm{ or }S.F.)$$
$$\ce{^{241}_{95}Am}$$ 432.2 y $$(α)$$ $$\ce{^{263}_{106}Sg}$$ 0.8 s $$(α\textrm{ or }S.F.)$$

## Footnotes

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

N1: Half-Lives for Several Radioactive Isotopes is shared under a not declared license and was authored, remixed, and/or curated by LibreTexts.