- debris such as scraps of cardboard, plastic, wood from rocket fins/sticks, ash, and leftover tubes that rain down over the ground after the performance of an aerial firework Fallout can be a hazard to people and dry materials since the pieces are usually still hot or smoldering
the radioactive material released into the atmosphere by activities such as the detonation of nuclear weapons, accidental emissions from nuclear power plants or natural occurrences (e g the eruption of Mount St Helens) that is transferred to the Earth
The process or phenomenon of the descent to the earth's surface of particles contaminated with radioactive material from the radioactive cloud The term is also applied in a collective sense to the contaminated particulate matter itself The early (or local) fallout is defined, somewhat arbitrarily, as those particles which reach the earth within 24 hours after a nuclear explosion The delayed (or worldwide) fallout consists of the smaller particles which ascend into the upper troposphere and into the stratosphere and are carried by winds to all parts of the earth The delayed fallout is brought to earth, mainly by rain and snow, over extended periods ranging from months to years
If you refer to the fallout from something that has happened, you mean the unpleasant consequences that follow it. Grundy lost his job in the fallout from the incident. Descent of radioactive materials from the atmosphere to the earth. Radioactivity in the atmosphere may arise from natural causes such as cosmic rays as well as from nuclear explosions and atomic reactor operations. The explosion of nuclear weapons leads to three types of fallout: local, tropospheric, and stratospheric. The first, intense but relatively short-lived, occurs as larger radioactive particles are deposited near the site of the explosion. Tropospheric fallout occurs when the finer particles enter the troposphere, and it spreads over a larger area in the month after the explosion. Stratospheric fallout, made of fine particles in the stratosphere, may continue years after the explosion, and the distribution is nearly worldwide. Many different radioisotopes are formed during a nuclear explosion, but only long-lived isotopes (e.g., cesium-137, strontium-90) are deposited as stratospheric fallout
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