Selected Radioactive Isotopes

Decay modes are \alpha , {\beta }^{-}, {\beta }^{+}, electron capture (EC) and isomeric transition (IT). EC results in the same daughter nucleus as would {\beta }^{+} decay. IT is a transition from a metastable excited state. Energies for {\beta }^{±} decays are the maxima; average energies are roughly one-half the maxima.

Selected Radioactive Isotopes
Isotope t1/2 DecayMode(s) Energy(MeV) Percent \gamma -Ray Energy(MeV) Percent
{\text{}}^{3}\text{H} 12.33 y {\beta }^{-} ­ 0.0186 100%
{\text{}}^{14}\text{C} 5730 y {\beta }^{-} 0.156 100%
{\text{}}^{13}\text{N} 9.96 min {\beta }^{+} 1.20 100%
{\text{}}^{22}\text{Na} 2.602 y {\beta }^{+} 0.55 90% \gamma 1.27 100%
{\text{}}^{32}\text{P} 14.28 d {\beta }^{-} 1.71 100%
{\text{}}^{35}\text{S} 87.4 d {\beta }^{-} ­ 0.167 100%
{\text{}}^{36}\text{Cl} 3\text{.}\text{00}×{\text{10}}^{5}\text{y} {\beta }^{-} 0.710 100%
{\text{}}^{40}\text{K} 1\text{.}\text{28}×{\text{10}}^{9}\text{y} {\beta }^{-} 1.31 89%
{\text{}}^{43}\text{K} 22.3 h {\beta }^{-} 0.827 87% \gamma \phantom{\rule{0.10em}{0ex}}\text{s} 0.373 87%
0.618 87%
{\text{}}^{45}\text{Ca} 165 d {\beta }^{-} ­ 0.257 100%
{\text{}}^{51}\text{Cr} 27.70 d EC \gamma 0.320 10%
{\text{}}^{52}\text{Mn} 5.59d {\beta }^{+} 3.69 28% \gamma \phantom{\rule{0.10em}{0ex}}\text{s} 1.33 28%
1.43 28%
{\text{}}^{52}\text{Fe} 8.27 h {\beta }^{+} 1.80 43% 0.169 43%
0.378 43%
{\text{}}^{59}\text{Fe} 44.6 d {\beta }^{-}\text{s} 0.273 45% \gamma \phantom{\rule{0.10em}{0ex}}\text{s} 1.10 57%
0.466 55% 1.29 43%
{\text{}}^{60}\text{Co} 5.271 y {\beta }^{-} ­ 0.318 100% \gamma \phantom{\rule{0.10em}{0ex}}\text{s} 1.17 100%
1.33 100%
{\text{}}^{65}\text{Zn} 244.1 d EC \gamma 1.12 51%
{\text{}}^{67}\text{Ga} 78.3 h EC \gamma \phantom{\rule{0.10em}{0ex}}\text{s} 0.0933 70%
0.185 35%
0.300 19%
others
{\text{}}^{75}\text{Se} 118.5 d EC \gamma \phantom{\rule{0.10em}{0ex}}\text{s} 0.121 20%
0.136 65%
0.265 68%
0.280 20%
others
{\text{}}^{86}\text{Rb} 18.8 d {\beta }^{-}\text{s} 0.69 9% \gamma 1.08 9%
1.77 91%
{\text{}}^{85}\text{Sr} 64.8 d EC \gamma 0.514 100%
{\text{}}^{90}\text{Sr} 28.8 y {\beta }^{-} ­ 0.546 100%
{\text{}}^{90}\text{Y} 64.1 h {\beta }^{-} ­ 2.28 100%
{\text{}}^{99m}\text{Tc} 6.02 h IT \gamma 0.142 100%
{\text{}}^{113m}\text{In} 99.5 min IT \gamma 0.392 100%
{\text{}}^{123}\text{I} 13.0 h EC \gamma 0.159 
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{\text{}}^{131}\text{I} 8.040 d {\beta }^{-}\text{s} 0.248 7% \gamma \phantom{\rule{0.10em}{0ex}}\text{s} 0.364 85%
0.607 93% others
others
{\text{}}^{129}\text{Cs} 32.3 h EC \gamma \phantom{\rule{0.10em}{0ex}}\text{s} 0.0400 35%
0.372 32%
0.411 25%
others
{\text{}}^{137}\text{Cs} 30.17 y {\beta }^{-}\text{s} ­ 0.511 95% \gamma 0.662 95%
1.17 5%
{\text{}}^{140}\text{Ba} 12.79 d {\beta }^{-} 1.035 
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\gamma \phantom{\rule{0.10em}{0ex}}\text{s} 0.030 25%
0.044 65%
0.537 24%
others
{\text{}}^{198}\text{Au} 2.696 d {\beta }^{-} ­ 1.161 
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{\text{}}^{197}\text{Hg} 64.1 h EC \gamma 0.0733 100%
{\text{}}^{210}\text{Po} 138.38 d \alpha 5.41 100%
{\text{}}^{226}\text{Ra} 1\text{.}\text{60}×{\text{10}}^{3}\text{y} \alpha \text{s} 4.68 5% \gamma 0.186 100%
4.87 95%
{\text{}}^{235}\text{U} 7\text{.}\text{038}×{\text{10}}^{8}\text{y} \alpha 4.68 
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\gamma \phantom{\rule{0.10em}{0ex}}\text{s} numerous <0.400%
{\text{}}^{238}\text{U} 4\text{.}\text{468}×{\text{10}}^{9}\text{y} \alpha \text{s} 4.22 23% \gamma 0.050 23%
4.27 77%
{\text{}}^{237}\text{Np} 2\text{.}\text{14}×{\text{10}}^{6}\text{y} \alpha \text{s} numerous \gamma \phantom{\rule{0.10em}{0ex}}\text{s} numerous <0.250%
4.96 (max.)
{\text{}}^{239}\text{Pu} 2\text{.}\text{41}×{\text{10}}^{4}\text{y} \alpha \text{s} 5.19 11% \gamma \phantom{\rule{0.10em}{0ex}}\text{s} 7\text{.}5×{\text{10}}^{-5} 73%
5.23 15% 0.013 15%
5.24 73% 0.052 10%
others
{\text{}}^{243}\text{Am} 7\text{.}\text{37}×{\text{10}}^{3}\text{y} \alpha \text{s} Max. 5.44 \gamma \phantom{\rule{0.10em}{0ex}}\text{s} 0.075
5.37 88% others
5.32 11%
others

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