鈽,又譯鈈,化學元素也,符號為Pu,原子序九十四,屬錒系元素。色澤銀白,遇氧而暗,蓋合氧而成二氧化鈽故也。
公元一九四〇年,美國人西博格始製迴旋加速器。翌年,麥克米倫用之,以氘核擊鈾靶,始得鈽,因冥王星(布魯圖)為名。美製原子彈,投諸日本,內藏鈽核,傷亡甚鉅。及美蘇爭霸,列國多儲鈽。一九九六年,始共約禁。
鈽同位素凡二十,自鈽二二八,至鈽二四七俱有,性皆不穩,易於衰變,富放射能。其中至穩者,鈽二四二也,每三十七萬六千年折半,釋氦核(阿爾法衰變)而為鈾二三八。
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