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NUCLEAR PROLIFERATION (1949-Present)
Events
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Postscript -- The Nuclear Age, 1945-Present
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Informing the Public, August 1945
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The Manhattan Engineer District, 1945-1946
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First Steps toward International Control,
1944-1945
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Search for a Policy on International Control,
1945
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Negotiating International Control,
1945-1946
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Civilian Control of Atomic Energy,
1945-1946
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Operation Crossroads, July 1946
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The VENONA Intercepts, 1946-1980
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The Cold War, 1945-1999
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Nuclear Proliferation, 1949-present
Even before the
atomic bombing of Hiroshima, many of the scientists of the
Manhattan Project were arguing that
international control of atomic energy
was essential. Any modern, industrialized state,
they reasoned, could eventually build its own atomic bomb
if it so chose. There was no "secret"
scientific theory or principle concerning the
bomb. Its possibility was fundamental to
modern physics. Then as now, the primary
difficulties were engineering related: separating
uranium-235 or producing plutonium and designing and
building the actual weapon.
To date eight nations have openly conducted nuclear
tests. They are:
The second nation to test an atomic
bomb was the United States's
Cold War
rival, the Soviet Union. This development was not
unexpected, but the timing was. The American
intelligence community generally believed the Soviet Union
would not have "the bomb" until 1952 or even
later, not August 1949. Soviet
wartime espionage
sped its weapons development, but probably only by a year
or two. (The bomb tested on August 29, 1949, closely
resembled the implosion device developed
at Los Alamos.) In August 1953, the
Soviet Union tested its first "boosted fission"
bomb, which used fusion to increase its
yield, and in November 1955 the Soviet Union produced its
first "true"
thermonuclear explosion
(left).
In 1952, Britain became the next
nation to join the "nuclear club." This
was not surprising, as the Manhattan Project had
essentially been a joint Anglo-American program,
especially once the British Mission of scientists arrived
at Los Alamos in 1943 and 1944. The
Atomic Energy Act
of 1946 prohibited the United States from assisting the
post-war British nuclear weapons program, but within six
years Britain was able to successfully perform a nuclear
test. At midnight on October 3, 1952, off the
Australian island of Trimouille, a 25 kiloton nuclear
weapon was detonated inside the hull of a British frigate,
H.M.S. Plym. The test was codenamed
"Hurricane" (right). On November 8, 1957,
Britain conducted its first fully successful thermonuclear
test, "Grapple X/Round C."
France and China joined the nuclear
club in the 1960s. The first French nuclear
explosion, "Gerboise Bleue," was an unusually
large first test: 60-70 kilotons. It was detonated
at Reggane, Algeria, on February 13, 1960. France
tested a thermonuclear weapon on the Pacific atoll of
Fangatuafa on August 24, 1968.
The first Chinese atomic test (left),
codenamed "596," took place at the Lop Nor
Testing Ground on October 16, 1964. (The leader of
China, Mao Zedong, had famously declared that nuclear
weapons, and by extension the United States, were a
"paper tiger," but that did not prevent him from
pushing the Chinese nuclear program through to
fruition.) Only three years later, on June 17, 1967,
China conducted its first thermonuclear test.
On July 1, 1968, the Nuclear
Non-Proliferation Treaty was signed by the United States,
Great Britain, the Soviet Union, and 59 other
nations. The purpose of the treaty was to prevent
the acquisition of nuclear weapons by any nation that did
not already possess them. The treaty took effect in March
1970, and in 1992 China and France joined as well.
As of 2000, only Cuba, Israel, India, and Pakistan had not
signed the Non-Proliferation Treaty.
The nuclear weapons programs of the
original five nuclear powers were driven primarily by Cold
War concerns. In the 1970s, however, a
largely-unrelated arms race in South Asia produced two
more members of the nuclear club: India and
Pakistan. India conducted its first atomic test,
"Smiling Buddha," on May 18, 1974 (right).
(The test was conducted underground.)
In the 1980s reports began to
emerge that, although it had not yet conducted a nuclear
test, Pakistan possessed nuclear weapons as well. In
May 1998, as retaliation for a new series of Indian
nuclear tests the previous month, Pakistan conducted
several tests of its own.
-
Informing the Public, August 1945
-
The Manhattan Engineer District, 1945-1946
-
First Steps toward International Control,
1944-1945
-
Search for a Policy on International Control,
1945
-
Negotiating International Control,
1945-1946
-
Civilian Control of Atomic Energy,
1945-1946
-
Operation Crossroads, July 1946
-
The VENONA Intercepts, 1946-1980
-
The Cold War, 1945-1990
-
Nuclear Proliferation, 1949-present
Previous
Sources and notes for this page.
The text for this page is original to the Department of
Energy's
Office of History and Heritage Resources. The information on the Nuclear
Non-Proliferation Treaty is from the Federation of
American Scientists (FAS) web page of the same title,
which is available at
http://www.fas.org/nuke/control/npt/. Other information for this entry was derived
from the country-specific pages on The Nuclear Weapon
Archive web site, available at
http://nuclearweaponarchive.org/, and the country-specific web pages from the FAS site,
the "Nuclear Forces Guide," available at
http://www.fas.org/nuke/guide/index.html. Photographs are courtesy the
Federation of American Scientists.
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