Wiktionary
radiocobalt
n. radioactive cobalt (especially when used as a tracer)
Usage examples of "radiocobalt".
But they never stopped trying, and some day Tartary, France, or Zanzibar would launch a missile of its own and it would mean nothing less than the end of the world in fire and plague as the rocket trails laced continents together and the bombers rained botulism, radiocobalt, and flasks of tritium with bikinis in their cores.