Yep, I've been to Hiroshima myself and there was no concern about radiation at all... It's been washed away after 73 years Of course, it's because both Hiroshi

Yep, I've been to Hiroshima myself and there was no concern about radiation at all... It's been washed away after 73 years Of course, it's because both Hiroshima and Nagasaki got bit by first generation atomic bomb, and are right next to the sea. A salted nuclear explosion in a deep desert or inside a cave might make a seemingly-forever radioactive fallout. But that's not a concern in nuclear power I'd say.