I live 2000km from Chernobyl
Chernobyl is not comparable to a nuclear bomb. Chernobyl is a reactor, made to release a steadily amount of radiations for years to make electricity.
Chernobyl irradiated a large area because the graphite that was located in the reactor core has burned, and the fumes have been carried by the wind, taking a lot of high-level activity nuclear waste hundred or thousands of kilometers away.
A bomb is way smaller than a reactor, and is designed to release most of its energy instantly to make the biggest explosion possible. That means a short burst of radioactivity very high level of radioactivity, with a very small half-life.
A few days after a bomb explodes, most of the radiations would have depleted.
Lv_InSaNe_vL@lemmy.world 3 weeks ago
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.
Waryle@jlai.lu 3 weeks ago
Thanks for sharing your researches