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Our Glaciers: Then and Now activity kit helps you see the changes taking place in glaciers around the world. See all our activity kits and classroom activities.
A schematic view of the Cherenkov effect.
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Radiation

If you are sitting in the dentist's chair and they decide to X-ray your teeth, they put a big shield over you for protection. Why? Because they need to shield you from 'radiation'.

Radiation comes in many forms. Radiation is another term for light, as in "ultraviolet radiation". Visible light, infrared, and X-rays are all other names for radiation at specific wavelengths. Radiation is also generated by charged particles, especially when they are moving very fast.

One place in nature where charged particles can move very fast is inside a planet's magnetic field. Earth, Jupiter, and even the little moon Ganymede, all are surrounded by belts of radiation.

Radiation can kill you. Radiation can also damage spacecraft. Radiation can harmful because it causes little defects in material, from human skin to metals, and causes matter to break down. Radiation can also do good things, though, such as helping doctors to image your body and determine what if something is wrong.

A special kind of radiation, called Cherenkov radiation is illustrated in this drawing.

Last modified September 19, 2003 by Roberta Johnson.

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Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part is sponsored in part through grants from federal agencies (NASA and NOAA), and partnerships with affiliated organizations, including the American Geophysical Union, the Howard Hughes Medical Institute, the Earth System Information Partnership, the American Meteorological Society, the National Center for Science Education, and TERC. The American Geophysical Union and the American Geosciences Institute are Windows to the Universe Founding Partners. NESTA welcomes new Institutional Affiliates in support of our ongoing programs, as well as collaborations on new projects. Contact NESTA for more information. NASA ESIP NCSE HHMI AGU AGI AMS NOAA