- Radiation | Definition, Types, Effects, Facts | Britannica
Radiation may be thought of as energy in motion either at speeds equal to the speed of light in free space—approximately 3 × 10 10 centimetres (186,000 miles) per second—or at speeds less than that of light but appreciably greater than thermal velocities (e g , the velocities of molecules forming a sample of air) The first type constitutes the spectrum of electromagnetic radiation that
- Radiation therapy - Mayo Clinic
Radiation therapy, also called radiotherapy, is a type of cancer treatment This treatment uses beams of intense energy to kill cancer cells Radiation therapy most often uses X-rays But other types of radiation therapy exist, including proton radiation Modern methods of radiation are precise
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