Atomic bomb test, 25 May 1953, Nevada, USA.
Codename: Grable
Yield: 15 kilo ton (size of the Hiroshima bomb).
Grable was an artillery test, fired from a 280mm cannon… and further contaminating land and air with many radioactive elements including plutonium 239 (half-life 24,400 years).
This photo (US Dep of Energy) taken from 7 miles away.
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