Hiroshima and Nagasaki are currently well populated health cities. The danger is exposure today.
The reports of radiation are extremely hard to interpret. Some are due to poor measurements and some are valid all reports are usually full of emotion. The hysteria of saying its 1000 times normal is quite misleading. 1000 times normal may be a safe level.
I don’t see the Japanese govt hiding anything. They are simply trying to get their hands around a massive massive problem.
“Hiroshima and Nagasaki are currently well populated health cities.”
And it’s only been 66 years!