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is3_94 - ground are not considered a serious hazard since...

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Unit 4 Nuclear Threat 4-7 How Fallout is Created The tremendous heat produced by any conventional or nuclear blast causes an up-draft of air which forms the familiar mushroom cloud. When a nuclear blast occurs near the earth's surface, millions of vaporized dirt particles are also drawn into the cloud. As the heat diminishes, any radioactive materials that have been vaporized condense on the drawn-up dirt particles, which are also condensing. Particles of Earth Drawn Up Into Mushroom Cloud Eventually these particles fall back to earth. This phenomenon is called radioactive fallout . This fallout material decays over a long period of time, and is the main source of the residual nuclear radiation. Hazards of Fallout Radioactive fallout emits alpha, beta, and gamma radiation. Alpha particles emitted from fallout on the
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Unformatted text preview: ground are not considered a serious hazard, since the source is outside the body. However alpha particles are harmful if the alpha-emitting source is taken into the body. The beta radiation which is much less penetrating than gamma radiation, may cause skin burns if the fallout remains on the body surface for a prolonged period of time. Exposure from the gamma radiation is considered the major hazard as a result of fallout. The extent, nature, and arrival time of fallout are difficult to predict accurately due to variables such as: O Energy yield of the weapon--a more powerful bomb will produce more fallout. O Height of explosion--a ground level blast will produce more fallout than an elevated blast....
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