Physics » Radioactivity and Nuclear Physics » Selected Radioactive Isotopes

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

Isotopet1/2DecayMode(s)Energy(MeV)Percent \(\gamma \)-Ray Energy(MeV)Percent
\({\text{}}^{3}\text{H}\)12.33 y\({\beta }^{-}\) ­0.0186100%   
\({\text{}}^{14}\text{C}\)5730 y\({\beta }^{-}\)0.156100%   
\({\text{}}^{13}\text{N}\)9.96 min\({\beta }^{+}\)1.20100%   
\({\text{}}^{22}\text{Na}\)2.602 y\({\beta }^{+}\)0.5590%\(\gamma \)1.27100%
\({\text{}}^{32}\text{P}\)14.28 d\({\beta }^{-}\)1.71100%   
\({\text{}}^{35}\text{S}\)87.4 d\({\beta }^{-}\) ­0.167100%   
\({\text{}}^{36}\text{Cl}\)\(3\text{.}\text{00}×{\text{10}}^{5}\text{y}\)\({\beta }^{-}\)0.710100%   
\({\text{}}^{40}\text{K}\)\(1\text{.}\text{28}×{\text{10}}^{9}\text{y}\)\({\beta }^{-}\)1.3189%   
\({\text{}}^{43}\text{K}\)22.3 h\({\beta }^{-}\)0.82787%\(\gamma \phantom{\rule{0.10em}{0ex}}\text{s}\)0.37387%
      0.61887%
\({\text{}}^{45}\text{Ca}\)165 d\({\beta }^{-}\) ­0.257100%   
\({\text{}}^{51}\text{Cr}\)27.70 dEC  \(\gamma \)0.32010%
\({\text{}}^{52}\text{Mn}\)5.59d\({\beta }^{+}\)3.6928%\(\gamma \phantom{\rule{0.10em}{0ex}}\text{s}\)1.3328%
      1.4328%
\({\text{}}^{52}\text{Fe}\)8.27 h\({\beta }^{+}\)1.8043% 0.16943%
      0.37843%
\({\text{}}^{59}\text{Fe}\)44.6 d\({\beta }^{-}\text{s}\)0.27345%\(\gamma \phantom{\rule{0.10em}{0ex}}\text{s}\)1.1057%
   0.46655% 1.2943%
\({\text{}}^{60}\text{Co}\)5.271 y\({\beta }^{-}\) ­0.318100%\(\gamma \phantom{\rule{0.10em}{0ex}}\text{s}\)1.17100%
      1.33100%
\({\text{}}^{65}\text{Zn}\)244.1 dEC  \(\gamma \)1.1251%
\({\text{}}^{67}\text{Ga}\)78.3 hEC  \(\gamma \phantom{\rule{0.10em}{0ex}}\text{s}\)0.093370%
      0.18535%
      0.30019%
      others 
\({\text{}}^{75}\text{Se}\)118.5 dEC  \(\gamma \phantom{\rule{0.10em}{0ex}}\text{s}\)0.12120%
      0.13665%
      0.26568%
      0.28020%
      others 
\({\text{}}^{86}\text{Rb}\)18.8 d\({\beta }^{-}\text{s}\)0.699%\(\gamma \)1.089%
   1.7791%   
\({\text{}}^{85}\text{Sr}\)64.8 dEC  \(\gamma \)0.514100%
\({\text{}}^{90}\text{Sr}\)28.8 y\({\beta }^{-}\) ­0.546100%   
\({\text{}}^{90}\text{Y}\)64.1 h\({\beta }^{-}\) ­2.28100%   
\({\text{}}^{99m}\text{Tc}\)6.02 hIT  \(\gamma \)0.142100%
\({\text{}}^{113m}\text{In}\)99.5 minIT  \(\gamma \)0.392100%
\({\text{}}^{123}\text{I}\)13.0 hEC  \(\gamma \)0.159\(\text{≈100%}\text{}\)
\({\text{}}^{131}\text{I}\)8.040 d\({\beta }^{-}\text{s}\)0.2487%\(\gamma \phantom{\rule{0.10em}{0ex}}\text{s}\)0.36485%
   0.60793% others 
   others    
\({\text{}}^{129}\text{Cs}\)32.3 hEC  \(\gamma \phantom{\rule{0.10em}{0ex}}\text{s}\)0.040035%
      0.37232%
      0.41125%
      others 
\({\text{}}^{137}\text{Cs}\)30.17 y\({\beta }^{-}\text{s}\) ­0.51195%\(\gamma \)0.66295%
   1.175%   
\({\text{}}^{140}\text{Ba}\)12.79 d\({\beta }^{-}\)1.035\(\text{≈100%}\text{}\)\(\gamma \phantom{\rule{0.10em}{0ex}}\text{s}\)0.03025%
      0.04465%
      0.53724%
      others 
\({\text{}}^{198}\text{Au}\)2.696 d\({\beta }^{-}\) ­1.161\(\text{≈100%}\text{}\)\(\gamma \)0.412\(\text{≈100%}\text{}\)
\({\text{}}^{197}\text{Hg}\)64.1 hEC  \(\gamma \)0.0733100%
\({\text{}}^{210}\text{Po}\)138.38 d\(\alpha \)5.41100%   
\({\text{}}^{226}\text{Ra}\)\(1\text{.}\text{60}×{\text{10}}^{3}\text{y}\)\(\alpha \text{s}\)4.685%\(\gamma \)0.186100%
   4.8795%   
\({\text{}}^{235}\text{U}\)\(7\text{.}\text{038}×{\text{10}}^{8}\text{y}\)\(\alpha \)4.68\(\text{≈100%}\text{}\)\(\gamma \phantom{\rule{0.10em}{0ex}}\text{s}\)numerous<0.400%
\({\text{}}^{238}\text{U}\)\(4\text{.}\text{468}×{\text{10}}^{9}\text{y}\)\(\alpha \text{s}\)4.2223%\(\gamma \)0.05023%
   4.2777%   
\({\text{}}^{237}\text{Np}\)\(2\text{.}\text{14}×{\text{10}}^{6}\text{y}\)\(\alpha \text{s}\)numerous \(\gamma \phantom{\rule{0.10em}{0ex}}\text{s}\)numerous<0.250%
   4.96 (max.)    
\({\text{}}^{239}\text{Pu}\)\(2\text{.}\text{41}×{\text{10}}^{4}\text{y}\)\(\alpha \text{s}\)5.1911%\(\gamma \phantom{\rule{0.10em}{0ex}}\text{s}\)\(7\text{.}5×{\text{10}}^{-5}\)73%
   5.2315% 0.01315%
   5.2473% 0.05210%
      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 
   5.3788% others 
   5.3211%   
   others    

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