RDS-4

RDS-4 (also known as Tatyana) was a Soviet nuclear bomb. It was the Soviet Union's first mass-produced tactical nuclear weapon. It used a plutonium implosion assembly and had a nominal yield of 30 kilotons. The bomb was delivered from a Tu-4 and Tu-16 aircraft. It was first tested at Semipalatinsk Test Site, on August 23, 1953. The bomb was dropped from an IL-28 aircraft at an altitude of 11 km and exploded at 600 m, with a yield of 28 kt.