Éléman teu boga satengah hirup, isotop unsur boga. Isotop stabil boga satengah hirup taya watesna. Isotop unsur tangtu, kayaning isotop tina timah (Sn) disangka jadi radioaktif, tapi satengah hirupna diperkirakeun jadi gede nu teu aya runtuh acan geus ditempo. Isotop nu satengah hirupna leuwih gede ti umur alam semesta bisa dianggap, pikeun sagala kaperluan praktis, stabil.
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