July 16, 1945
TrinityHiroshimaNagasakiCrossroads Baker (first underwater)Ivy Mike (first fusion bomb, 90% fission yield)Ivy King (highest yield fission bomb)Castle Bravo (first dry fuel fusion bomb, 90% fission yield)Castle Romeo (test of first deliverable fusion bomb, MK-17)Redwing Zuni (test of first clean fusion bomb)Redwing Navaho (test of clean fusion bomb, only 5% fission yield)Tzar Bomba (highest yield fusion bomb, USSR)etc.
The first Soviet test of a hydrogen bomb, took place on a tower on August 12, 1953. It used a layer-cake design of alternating fission and fusion fuels (uranium-235 and lithium-6 deuteride) and produced a yield of 400 kilotons, mostly from fusion-neutron-initiated fission rather than fusion. This device however was not what is now considered a hydrogen bomb, instead it would be called a boosted fission bomb. However it was the first bomb using nuclear fusion that was small enough and light enough to be deliverable by bomber. The first Soviet test of a "true" hydrogen bomb was airdropped and produced a yield of 1.6 megatons on November 22, 1955. This was the world's first actual airdropped fusion bomb.
In WWII the United States used only two Atomic Bombs agains Japan. The first bomb was a gun-type fission bomb known as "Little Boy". "Little Boy" was dropped on the Japanese city of Hiroshima. The second bomb was an implosion-type fission bomb known as "Fat Man". "Fat Man" was dropped on the Japanese city of Nagasaki.
Leo Szilard invented the atomic fission bomb in 1933 while in London, and patented it in 1934. However no material that fissioned was known at the time, so the bomb was not possible to build at that time.Otto Frisch discovered fission of Uranium-235 in 1938 while in Berlin, making the atomic fission bomb possible. However Uranium-235 is only 0.72% of natural Uranium and purifying it is difficult and expensive, so an atomic fission bomb could not be built immediately.The US Manhattan Project built the expensive industrial infrastructure it purify Uranium-235 and manufacture Plutonium-239 between 1942 and 1945. Resulting in a usable atomic fission bomb by 1945.
The term atomic bomb is a general one. It refers to any kind of nuclear weapon. But there are basically a couple of different types of nuclear weapon: the fission weapon, and the fusion weapon. (We can split hairs and add some, but let's not.) In a "regular" atomic or nuclear weapon, a fission weapon, subcritical masses of fissile material, usually plutonium, are driven together by conventional explosives and the thing goes off. Boom! There is fission, but no fusion. That differentiates this type of weapon from a fusion device. The term fusion deviceis used to talk about what used to be called the hydrogen bomb. The fusion weapon must have a fission device to create the heat necessary for fusion to occur, and it uses the fission bomb to "trigger" fusion in that light. If someone uses the term "fission bomb" in a presentation, they are not talking about the so-called hydrogen bomb or any fusion weapon - if they are using the term correctly.
The element first used for fission in an atomic bomb is uranium.
first fission bomb 1945first fusion bomb 1954
The fission bomb is known as the Nuclear bomb, or the A-bomb
The uranium fission bomb over Hiroshima.
TrinityHiroshimaNagasakiCrossroads Baker (first underwater)Ivy Mike (first fusion bomb, 90% fission yield)Ivy King (highest yield fission bomb)Castle Bravo (first dry fuel fusion bomb, 90% fission yield)Castle Romeo (test of first deliverable fusion bomb, MK-17)Redwing Zuni (test of first clean fusion bomb)Redwing Navaho (test of clean fusion bomb, only 5% fission yield)Tzar Bomba (highest yield fusion bomb, USSR)etc.
There were no nuclear tests in 1950 of either atomic fission or hydrogen fusion bombs.The first hydrogen fusion bomb tests were in 1951 in Operation Greenhouse and none of the devices were an actual hydrogen bomb. "Item" was a prototype tritium gas boosted fission bomb, "George" was a deuterium fusion ignition test with well over 95% of its yield the fission primary, and "Easy" and "Dog" were MK-5 and MK-6 atomic bomb design improvement verification tests.
Fission.
Fission.
Two atomic bombs, a gun-triggered uranium fission bomb, and a plutonium-core trigger fission bomb.
A fission bomb relies on nuclear fission (splitting atoms) to release energy, while a fusion bomb relies on nuclear fusion (merging atoms) to release energy. Fusion bombs are more powerful than fission bombs and are often referred to as thermonuclear or hydrogen bombs.
If you are asking which has the maximum danger, a hydrogen bomb is one type of nuclear bomb. In general, nuclear bombs can be fission (called atomic) or fusion (hydrogen) A fusion bomb is larger than an fission bomb, and actually uses a fission bomb to start the fusion reaction.
The "Little Boy" bomb used in the Hiroshima bombing was a fission bomb, specifically a gun-type uranium-235 bomb. It relied on the nuclear fission of uranium-235 to release a massive amount of energy.