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Soviet atomic bomb
The RDS-2 (Russian: РДС-2) was the second atomic bomb developed by the Soviet Union as an improved version of the RDS-1. It included new explosive lenses along with a new core design to decrease the probability of pre-detonation or 'fizzle'. The RDS-2 weighed approximately 3,200 kilograms (7,055 lb) and had a diameter of 1.25 m. The RDS-2 was tested on September 24, 1951 and produced a 38.3 kiloton yield. It was detonated from the top of a tower thirty meters high. The detonation was initiated by a bomber flying over the testing site instead of the detonation being initiated by a ground control center.
Bukharin, Oleg; Von Hippel, Frank (2001). Podvig, Pavel Leonardovich (ed.). Russian Strategic Nuclear Forces. Cambridge Massachusetts: The MIT Press. ISBN9780262162029.
Andryushin, I.A.; Chernyshev, A.K.; Udin, Yu.A. (2003). УКРОЩЕНИЕ ЯДРА [Nuclear taming] (PDF) (in Russian). Sarov: Red October. Archived from the original (PDF) on December 31, 2018.
"РДС-27" [RDS-27] (in Russian). 20 March 2013. Archived from the original on January 3, 2019.