system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are Hiroshima, Nagasaki and many of the Pacific Islands used for nuclear testing safe to live in today, but the area around Chernobyl isn't?
gpt
Essentially Hiroshima and Nagasaki were an explosive release of a tiny amount of radioactive material, atomizing and blowing the little bits that were left across a pretty huge footprint, kind of like  a pinch of dust in front of a table fan. 

Chernobyl saturated its entire surrounding area with TONS of the stuff and much of it settled out in the immediate area. So someone poured a bucket of sand on that same fan.