It happened many times that a nuclear device exploded or by other means entered atmosphere. Lunch site explosions also happened. I think the on the ground accid

It happened many times that a nuclear device exploded or by other means entered atmosphere. Lunch site explosions also happened. I think the on the ground accidents are less serious because you can contain them and it is less spread out than for example a satellite exploding in the higher atmosphere. https://listverse.com/2012/01/20/top-10-space-age-radiation-incidents/ https://listverse.com/2012/01/20/top-10-space-age-radiation-...