Atom Bomb

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atomic bomb

, atom bomb
a type of bomb in which the energy is provided by nuclear fission. Uranium-235 and plutonium-239 are the isotopes most commonly used in atomic bombs
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Atom Bomb


a bomb with a nuclear charge dropped from aircraft. The first atom bombs were made in the USA at the end of World War II. The explosion of an atom bomb releases a tremendous amount of nuclear energy. In July 1945 the Americans tested the atom bomb and then dropped two bombs with the equivalent of 20,000 tons of TNT on the Japanese cities of Hiroshima (Aug. 6) and Nagasaki (Aug. 9, 1945). The explosion of the atom bombs caused great destruction in these cities and enormous casualties among the peaceful civilian population. More than 140,000 people were killed or wounded in Hiroshima and about 75,000 in Nagasaki. Subsequently several hundred thousand people died as a result of the aftereffects of the atomic bombardment. The use of the atom bombs was not caused by any military necessity. The American ruling circles gambled on a temporary US monopoly in nuclear weaponry and tried to use it to intimidate freedom-loving peoples. But the atomic “secrets” were discovered as early as 1947 by Soviet scientists headed by Academician I. V. Kurchatov; in August 1949 the USSR made an experimental explosion of an atomic device, which led to the end of any possibility of atomic blackmail. The term “atom bomb” is now rarely used.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
A more basic question about the morality of the use of atom bombs is whether war is ever reasonable or desirable.
Experts insist Iran is years away from an atom bomb.
Most explosive of all Gouzenko's revelations concerned the primary target of Soviet espionage at that time: the atom bomb. A monumental collaborative war effort by scientists from Britain, Canada, and the U.S.
There are indications Saddam Hussein is again engaged in building atom bombs. Richard Butler, former head of UNSCOM - the UN Special Commission that dealt with uncovering Iraq's weapons of mass destruction - disclosed in New York recently that the Iraqi dictator had reasembled his nuclear weapons team.
Denouncing the Cox report as "groundless, vicious slander," Zhao stated China developed neutron bombs, atom bombs and hydrogen bombs without the aid of espionage.
In Hiroshima and Nagasaki, more than 100,000 civilians died after the United States dropped atom bombs on them.
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Combined with the Soviet Union's entry into the conflict after Hiroshima, the atom bombs brought about Japan's surrender within a few days.
Which US president authorised the dropping of the atom bombs on Hiroshima and Nagasaki?
The US lost the war in the Vietnam despite having atom bombs, while Russia lost in Afghanistan.
On Tinian, the Seabees constructed special buildings and bomb-loading pits to accommodate the 509th Composite Group--the unit that would drop the atom bombs on Japan.