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Top 100 means about half of all countries.
So many people having their fingers at the triggers. There would be many unreasonable and evil ones among them.
We would have nuclear war every year.
I suspect we'd only have it once.
I suggest to read about Hiroshima, and what really happened there, and afterwards.
Here's a good book: Hibakusha: Survivors of Hiroshima and Nagasaki https://a.co/d/8KS4RXC
One bomb kills people in a circle of 10 or 50 km (I forgot), and injures people maybe 100km around. Then it does damage to nature maybe even 1000 km around. I live 2000km from Chernobyl, and we had some warnings regarding vegetables for a year or so.
But the planet has a circumference of 40.000 km. Now let your thoughts run around the planet.
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.
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