[Dog Gone]

There would be a very wide area - formerly quite densely populated - which would no longer be inhabitable, or suitable for any meaningful use for decades at a minimum.

For how many decades was Hiroshima uninhabitable?

[RightWhale]

The Hiroshima trolley continued to operate that very day all day including downtown. People began to come downtown the next day to look around and say stuff like 'Wow! One bomb did all that!'