A modern unit of radioactivity replacing the curie; the activity of an amount of a radioactive material in which one nucleus decays each second.

The distance from an explosion to an observer is called the slant range. For a burst height, h, and a distance, d, from ground zero to a given point, the slant range, D, is from the Pythagorean theore [..]

At 11:02 a.m. on August 9, 1945 a plutonium implosion bomb, Fat Man, was dropped on Nagasaki. The yield was 22 kilotons. The damage was less extensive, due partly to the geography of the Nagasaki area [..]

A ground-based anti-ballistic missile system designed to protect a country against ballistic missile threats.

Intelligence gathering systems under national control, such as photo-reconnaissance satellites and ground based radars, used to monitor compliance with agreed arms limitations

A neutral particle of approximately unit mass, present in all atomic nuclei, except those of ordinary hydrogen. Neutrons are required to initiate the fission process, and large numbers of neutrons are [..]

The neutron bomb differs from standard nuclear weapons insofar as its primary lethal effects come from the radiation damage caused by the neutrons it emits. It is also known as an enhanced-radiation w [..]

In fission bombs the neutrons are produced in the fission process. They are emitted from the highly excited fission products. The way that neutrons interact with matter is quite different from the way [..]

Under the nuclear Non-Proliferation Treaty, these are states that had not detonated a nuclear device prior to January 1, 1967, (that is, all states other than the United States, the Soviet Union [now [..]

Prevention of the spread of weapons of mass destruction.