Jisho

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同位体
Wikipedia definition
1. Isotopes of cadmiumNaturally occurring cadmium (Cd) 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 Cd and Cd (two-neutrino double beta decay, half-life is 2.9 × 10 years). The other three are Cd, Cd, and Cd; only lower limits on their half-life times have been set.
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