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that do not occur naturally, the most long-lived are ¹⁰⁹Cd with a half-life of 461.3 days, and ¹¹⁵Cd with a half-life of 53.46 hours. All of the remaining radioactive isotopes have half-lives of less than 7 hours, and the majority have half-lives of less than 5 minutes. Cadmium has 8 known meta states, with the most stable being ^113mCd (t_1/2 = 13.9 years), ^115mCd (t_1/2 = 44.6 days),

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