The hysteria is unbelievable. Wish people could think or even read. Radioactivity spreads globally through radio active dust. That dust has a very, short shelf-life, 4-5 days max. Even it it made it across the pacific it would be much decreased in energy and harmful effects.
When the bombs went off in Nagasaki and Hiroshima, I didn’t see mass death on the west coast of the U.S. There was exponetially more radio active dust and particles sent into the atmosphere then.
If you look at the data from the Nevada/Utah blasts, you will see there were significant effects on the east coast although they weren’t documented for decades (cancer rates).
One notable story relating to that time was the government notifying Kodak plants on the east coast and in the Midwest when radiation was expected so as not to interrupt film production - the radiation was fogging their film.