Cadmium-111

Main isotopes of cadmium

iso­tope NA half-life DM DE (MeV) DP 106Cd 1.25% is stable with 58 neutrons 107Cd syn 6.5 h ε 1.417 107Ag 108Cd 0.89% is stable with 60 neutrons 109Cd syn 462.6 d ε 0.214 109Ag 110Cd 12.47% is stable with 62 neutrons 111Cd 12.80% is stable with 63 neutrons 112Cd 24.11% is stable with 64 neutrons 113Cd 12.23% 7.7×1015 y β− 0.316 113In 113mCd syn 14.1 y β− 0.580 113In IT 0.264 113Cd 114Cd 28.75% is stable with 66 neutrons 115Cd syn 53.46 h β− 1.446 115In 116Cd 7.51% 3.1×1019 y β−β− 2.809 116Sn
Standard atomic weight (Ar)	112.414(4)

Naturally occurring cadmium (₄₈Cd) is composed of 8 isotopes. For two of them, natural radioactivity was observed, and three others are predicted to be radioactive but their decays were never observed, due to extremely long half-life times. The two natural radioactive isotopes are ¹¹³Cd (beta decay, half-life is 8.04 × 10¹⁵ years) and ¹¹⁶Cd (two-neutrino double beta decay, half-life is 2.8 × 10¹⁹ years). The other three are ¹⁰⁶Cd, ¹⁰⁸Cd (double electron capture), and ¹¹⁴Cd (double beta decay); only lower limits on their half-life times have been set. At least three isotopes—¹¹⁰Cd, ¹¹¹Cd, and ¹¹²Cd—are absolutely stable (except, theoretically, to spontaneous fission). Among the isotopes absent in the natural cadmium, the most long-lived are ¹⁰⁹Cd with a half-life of 462.6 days, and ¹¹⁵Cd with a half-life of 53.46 hours. All of the remaining radioactive isotopes have half-lives that are less than 2.5 hours and the majority of these have half-lives that are less than 5 minutes. This element also has 8 known meta states with the most stable being ^113mCd (t_1/2 14.1 years), ^115mCd (t_1/2 44.6 days) and ^117mCd (t_1/2 3.36 hours).

The known isotopes of cadmium range in atomic mass from 94.950 u (⁹⁵Cd) to 131.946 u (¹³²Cd). The primary decay mode before the second most abundant stable isotope, ¹¹²Cd, is electron capture and the primary modes after are beta emission and electron capture. The primary decay product before ¹¹²Cd is element 47 (silver) and the primary product after is element 49 (indium).

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