a few days after a bomb explodes, most of the radiation would have depleted.
I know this is a settled fact, and supported by the fact that Japan had rebuilt both cities in under 6 years. But I wanted hard facts on this. Which, as it turns out, is really hard to find. I see a lot of reports basically echo what you said but nobody seems to have actually really measured this.
The best sources I found was this document from the which claims that soil radiation fell from 4.31 micro Curries per cm3 in hour 3, to just 0.23 half a day later, and 3.1x10(-5) 45 days later.
This site from the Japanese government claims that 24hrs after detonation the radiation at ground zero was 1/1000th of what it was immediately after.
I know this is a settled fact, and supported by the fact that Japan had rebuilt both cities in under 6 years. But I wanted hard facts on this. Which, as it turns out, is really hard to find. I see a lot of reports basically echo what you said but nobody seems to have actually really measured this.
The best sources I found was this document from the which claims that soil radiation fell from 4.31 micro Curries per cm3 in hour 3, to just 0.23 half a day later, and 3.1x10(-5) 45 days later.
This site from the Japanese government claims that 24hrs after detonation the radiation at ground zero was 1/1000th of what it was immediately after.
Thanks for sharing your researches