Since then controlling the proliferation of nuclear weapons has been an important issue in international relations and the two detonations in japan remained the only ever usage in warfare. The first nuclear weapons were detonated over hiroshima and nagasaki in august 1945. Nuclear weapons technology was developed during the 1930s and 1940s.
Tested on 30 october 1961 as an experimental verification of calculation principles and multi stage thermonuclear weapon designs it. Tsar bomb was the most powerful nuclear weapon ever created. The soviet rds 220 hydrogen bomb code name ivan or vanya known to the western nations as tsar bomba russian.
The explosive yield of a nuclear weapon is the amount of energy released when that particular nuclear weapon is detonated usually expressed as a tnt equivalent the standardized equivalent mass of trinitrotoluene which if detonated would produce the same energy discharge either in kilotons kt thousands of tons of tnt in megatons mt millions of tons of tnt or sometimes in. Pure fission weapons the simplest and least technically demanding were the first nuclear weapons built and have so far been the only type ever used in an act of war over wartime japan. There are three existing basic design types.
Nuclear weapon designs are physical chemical and engineering arrangements that cause the physics package of a nuclear weapon to detonate. In order of acquisition of nuclear weapons these are the united states russia the successor state to the soviet union the united kingdom france and china. Five are considered to be nuclear weapon states nws under the terms of the treaty on the non proliferation of nuclear weapons npt.
Eight sovereign states have publicly announced successful detonation of nuclear weapons. This is why the world s governments are trying to control the spread of nuclear bomb making technology and materials and reduce the arsenal of nuclear weapons deployed during the cold war. Nuclear weapons have incredible long term destructive power that travels far beyond the original target.
Fission weapons are commonly referred to as atomic bombs and fusion weapons are referred to as thermonuclear bombs or more commonly hydrogen bombs. Nuclear weapon device designed to release energy in an explosive manner as a result of nuclear fission nuclear fusion or a combination of the two. The united states detonated two nuclear weapons over the japanese cities of hiroshima and nagasaki on august 6 and 9 1945 respectively with the consent of the united kingdom as required by the quebec agreement the two bombings killed between 129 000 and 226 000 people most of whom were civilians and remain the only uses of nuclear weapons in armed conflict.