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同位素 (isotope)是一種化學元素 (chemical element)的無仝形式;(人因)原子核 (atomic nucleus)的原子番 (atomic number)相(相同),質量番 (mass number)無仝;徛講陽子平濟粒,毋過中子無平濟。

同位素本底的意思是講佇周期表占仝一位的元素,同位素佇科學的號名法 (nomenclature)是用元素的名字加一个連字號,後壁閣接質量番來表示,親像講He-3 (氦-3;helium-3)、C-12 (碳-12;carbon-12)、C-14 (碳-14;carbon-14)、I-131 (碘-131;iodine-131)、U-238 (鈾-238;uranium-238),佇化學符號 (chemical symbol)就加質量番囥佇元素符號頭前頂懸,像講 3He、 12C、 14C、 131I 和 238U。


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