It’s been posted on HN before, but if this topic interests you, John Hersey’s famous reporting on the aftermath at Hiroshima (entitled “Hiroshima”) is worth reading. It’s essentially a short book, but the accounts laid out in the story make the impersonal tragedy into something that’s tangible. It should be required reading.
There’s also a second reporting, from years later, on what some of the survivors have become.
It tells about the lifelong vaguely defined health impacts those exposed to the bomb had to live with, and how they tried to rebuild their lives after having truly lost everything and, for some of them, everyone.