Can Polonium 210 leak from a sealed container?
Yes. The alpha particles from the decaying Polonium 210 produce increasing heat and pressure as they collide with the walls of a container. Over time, that heat and pressure can force an opening in the seal. Once sub-microscopic particles of Polonium 210 leak out, they can attach themselves to dust and spread from person to person, as happened in the Israeli leak in the 1960s.