the USSR became the second country to successfully test a nuclear weapon. RDS-1, dubbed "First Lightning" by the Soviets and "Joe-1" by the US, produced a 20 kiloton explosion and was essentially a copy of the American Fat Man plutonium implosion design.

Fusion explosions

The first explosion involving thermonuclear fusion was the 1951 US Greenhouse George test, using a deuterium-tritium

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