ˌNuclear ˌNon-prolifeˈration ˌTreaty, the
an international agreement which aims to prevent nuclear weapons from spreading around the world, but which allows countries to use nuclear technology peacefully. In 1970 the US, Britain, and the Soviet Union signed the agreement, followed by China and France in 1992. Since then, 184 other countries without nuclear weapons have agreed to use nuclear technology only for peaceful purposes. The International Atomic Energy Agency has the job of checking that countries are obeying the agreement.

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Nuclear Non-Proliferation Treaty
The NPT became effective in 1970 and was intended to limit the number of states with nuclear weapons to five: the U.S., the Soviet Union, Britain, France, and China. In doing so, the NPT attempts to: (a) prevent nuclear weapons sales by not assisting other nations with nuclear weapons development; (b) halt the nuclear weapons development programs of non-nuclear weapons states; and (c) promote nuclear disarmament and the peaceful use of nuclear technologies and materials. Over 140 states have pledged not to acquire nuclear weapons and to accept the safeguards of the International Atomic Energy Agency over all their nuclear materials.

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