Over 25 isotopes of Polonium are known, with atomic masses ranging from 192 to 218. Polonium-210, the predominant isotope of polonium, is radioactive and emits alpha particles on decay.

• 现时已知道钋元素有25个同位素,它们的质量数由192至218,钋210是当中显著的一个同位素,具放射性特徵,会释出放射性阿尔法粒子。