🛠️ Invention or technique

RDS-1, first Soviet atomic bomb

RDS-1, primera bomba atómica soviética

Date
29 de agosto de 1949 · confidence high
Place
Semipalatinsk Test Site, Kazakhstan
Credited to
Igor Kurchatov (scientific director) and Lavrentiy Beria (project head)
Field
Conflict

What it is

The first Soviet nuclear weapon test: an implosion plutonium bomb similar to the American «Fat Man», detonated on a 30 m tower. It broke the US monopoly and opened the arms race.

The design drew on information obtained through espionage (Klaus Fuchs), although Soviet physicists carried out the industrial development. The tower stood in a test area now in Kazakhstan.

What it led to

  • the Cold War arms race
  • the Soviet hydrogen bomb (RDS-6s, 1953) and the Semipalatinsk site (456 tests until 1989)
  • the closure of the site in 1991 and Kazakhstan's denuclearisation
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Sources✓ verified 2026-11-04