Yeah well, they can still be dangerous. Otherwise, why don't they just wait it out in Fukushima? Atoms are very small, so even tiny amounts of matter contain a

Yeah well, they can still be dangerous. Otherwise, why don't they just wait it out in Fukushima? Atoms are very small, so even tiny amounts of matter contain a lot of them. So even if any single atom only emits radiation every couple of years, a tiny lump of matter can emit radiation more often than every couple of years, because there are so many atoms in it.