痕量同位素
痕量同位素是指在自然界中僅以極少的量（即痕量）存在的同位素，皆為半衰期較短的放射性同位素。自然界中的痕量同位素大多為長壽命的原始（英语：Primordial nuclide）放射性同位素（如鈾-238、釷-232等）之衰變產物，或者是宇宙射線撞擊地球物質後的產物。
列表
僅以痕量存在的元素
| 原子序 | 元素名称 | 元素符号 |
|---|---|---|
| 43 | 锝 | Tc |
| 61 | 钷 | Pm |
| 84 | 钋 | Po |
| 85 | 砹 | At |
| 86 | 氡 | Rn |
| 87 | 钫 | Fr |
| 88 | 镭 | Ra |
| 89 | 锕 | Ac |
| 91 | 镤 | Pa |
| 93 | 镎 | Np |
| 94 | 钚 | Pu |
其他痕量同位素
引用
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