Atomic Bomb

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A weapon of mass destruction powered by the fission of the nuclei of heavy atoms—e.g., plutonium-239 or uranium-235—which follows bombardment of the fuel with neutrons, resulting in a chain reaction and release of pressure, heat, light, and radiation
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He was trying to improve the efficiency of the fission bomb. His idea was to use the material flux from an exploding fission weapon to compress a container that held the light isotopes.
Paul Ehrlich, one of the loudest and most influential voices in the movement, proclaims in his textbook-like Ecoscience, "The knowledge needed to construct fission bombs ...
"Even if it was a test of a boosted fission bomb, it must have been unsuccessful," a South Korean defense ministry official, reportedly said, adding: "The destructive power of the Wednesday test reached 6 kilotons, it's far too weak for a hydrogen bomb."
They include using uranium deuteride to produce a short burst of neutrons (the only use for which is to initiate the chain reaction in a fission bomb), producing uranium metal and shaping it into nuclear-sized components (useful only for making the metal core of a fission bomb), using special detonators to produce an implosive spherical shock wave (needed to compress the core before setting off the chain reaction in a fission bomb), and testing high voltage firing equipment to insure that it can fire detonators over long distances (needed for nuclear weapon testing).
On July 16, 1945, at a site 60 miles northwest of the town of Alamogordo, New Mexico, a nuclear fission bomb (popularly called an atomic bomb, or an A-bomb) made of plutonium was detonated before dawn.
It takes countries many years to independently develop the technology needed to create a fission bomb and then make the subsequent jump to fusion weapons.
Of the two larger explosions, it was claimed one was of an improved fission bomb and the other was a thermonuclear device," Iyengar wrote.
On August 6, 1945, the United States dropped a nuclear fission bomb on the Japanese city of Hiroshima and on August 9, another bomb on Nagasaki.
Some way can be found to include hydrogen and other light elements with an ordinary fission bomb in such a way that the fission explosion produces sufficient temperature and pressure to ignite the much more powerful and destructive fusion explosion.
It was planned to fuse a mixture of hydrogen-2 and hydrogen-3 in liquid form by exposure to the temperatures and pressures produced by a fission bomb.
Even before the first fission bomb had been exploded, a controlled nuclear reactor (although a very inefficient one) had been set up in Chicago in 1942.
In July 1945, scientists exploded the first nuclear fission bomb and changed the course of global war and politics.