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Message definition (Zinc ) Several dozen [[radioisotope]]s have been characterized. {{chem|65|Zn}}, which has a half-life of 243.66 days, is the least active radioisotope, followed by {{chem|72|Zn}} with a half-life of 46.5 hours. Zinc has 10 [[nuclear isomer]]s, of which <sup>69m</sup>Zn has the longest half-life, 13.76 h. The superscript ''m'' indicates a [[metastable]] isotope. The nucleus of a metastable isotope is in an [[excited state]] and will return to the [[ground state]] by emitting a [[photon]] in the form of a [[gamma ray]]. {{chem|61|Zn}} has three excited metastable states and {{chem|73|Zn}} has two. The isotopes {{chem|65|Zn}}, {{chem|71|Zn}}, {{chem|77|Zn}} and {{chem|78|Zn}} each have only one excited metastable state.
数十種類の放射性同位体 が特徴づけられている。半減期が243.66 日の65 72 核異性体 があり、そのうち69m Znの半減期は13.76時間と最も長い。上付き文字m は準安定 同位体を示す。準安定同位体の原子核は励起状態 にあり、ガンマ線 の形で光子 を放出することで基底状態 に戻る。61 73 65 71 77 78