There were tests on Johnson Island, and at Bikini Atoll, late 50's, early 60's.
The recon squadron I was in, {67th Recon Tech, Yokota AFB, Japan}, had films, covering the tests.
I saw some of the pics, about 61-62. DAMN!
One of the lab supervisors was the camera man, on the observation aircraft. His story was pretty scary!
I also saw pics of Nagasaki and Hiroshima.
We used to see the survivors holding ban the bomb rallys, in Tokyo. Sad.
The occupation forces had left Japan in 1952. I got there in 61....Still a lot of animosity.