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Radiation is energy, such as heat, light and radio waves, that moves at high speed through space or matter. One type of radiation is produced by so-called radioactive materials.
Radiation is part of nature, and humans are exposed to radiation all the time. It comes from rocks in the earth, from the sun and stars. Radiation also comes from common man-made sources, such as many building materials, smoke detectors and medical X-rays.
Radiation has been very well-studied for a hundred years. It can be very useful when properly controlled for peaceful purposes such as for medical X-rays and the production of electricity. But radiation can be dangerous. In too large a dose, radiation can cause harm by damaging living cells. Excessive doses of radiation need to be guarded against.
At every one of our country’s more than 100 nuclear power plants, every safety precaution is taken to isolate, shield and prevent radioactive materials from escaping to the environment.
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