Radiation has two meanings in physics. The first refers to propagating energy, and sometimes to the energy itself. An example is a light wave--its photons each have energy. The second meaning is the process of a body emitting energy, as in a pipe...

The term radiation broadly applied to a class of physical phenomena that share a characteristic loss of energy in the radiating body or system that results in a propagation of particles and/or waves that carry the ability to do work and thus change the...

(1) Transfer of heat through electromagnetic waves from hot to cold. (2) Electromagnetic waves of energy having frequency and wavelength. The shorter wavelengths (higher frequency) are more energetic. The electromagnetic spectrum is comprised of gamma...

Radiation is everywhere. Life would not exist on Earth without radiation from the sun. Additionally, many important technological activities are based on radiation, such as radio and telecommunications. Another type of radiation is used for producing...

Radiation, as used in physics, is energy in the form of waves or moving subatomic particles. Radiation can be classified as ionizing or non-ionizing radiation, depending on its effect on atomic matter. The most common use of the word "radiation" refers...

A week or two of radiation to the head helped keep a very deadly form of lung cancer from spreading to the brain, improving survival for some people who have had little hope of successful treatment until now, Dutch doctors reported Saturday.It is the first...

When prostate surgery fails to remove all traces of cancer, men face a decision about whether to have radiation therapy. Radiation can lead to bowel and urinary problems, but patients might find that risk acceptable if there were evidence it...

Would cockroaches survive a nuclear holocaust that killed everything else? That question is being tested this week at the nearby Hanford nuclear reservation by a team from the "Mythbusters" show on the Discovery Channel, which expects to air the episode in about four months."It's been...

Women with early-stage breast tumors can undergo a shorter course of radiation without a greater risk that their cancer will come back years later, the largest study to test this suggests.The results are good news for women who must quit work or travel far to...