> a source would be valuable. Seems a bit strange having to cite something I learned in secondary school science class, but okay. https://en.wikipedia.org/wik

> a source would be valuable. Seems a bit strange having to cite something I learned in secondary school science class, but okay. https://en.wikipedia.org/wiki/List_of_radioactive_isotopes_by_half-life https://en.wikipedia.org/wiki/List_of_radioactive_isotopes_b...