What is radiation?

  • (noun): The act of spreading outward from a central source.
    See also — Additional definitions below


In physics, radiation is a process in which energetic particles or energetic waves travel through vacuum, or through matter-containing media that are not required for their propagation. Waves of a massive medium itself, such as water waves or sound waves, are usually not considered to be forms of "radiation" in this sense. By contrast, gravitational waves, which are waves of space-time itself, qualify as a type of radiation.

Read more about Radiation.

Some articles on radiation:

Infrared Window - Kinetics of The Infrared Atmospheric Window
... It separates two radiative components, window and non-window radiation, that are not of the kind that have kinetics suitable for description by the Beer-Lambert law ... The window radiation and the non-window radiation from the land-sea surface are not defined in the terms that are necessary for the application of the Beer-Lambert ... a logical and conceptual error to try to apply the Beer-Lambert Law either to window or non-window radiation considered separately ...
Uses of Radiation - In Science
... Radiation is used to determine the composition of materials in a process called neutron activation analysis ... elements in the sample by studying the emitted radiation ...
Synchrotron Radiation
... The electromagnetic radiation emitted when charged particles are accelerated radially is called synchrotron radiation ... It is similar to cyclotron radiation except that synchrotron radiation is generated by the acceleration of ultrarelativistic charged particles through magnetic fields ... Synchrotron radiation may be achieved artificially in synchrotrons or storage rings, or naturally by fast electrons moving through magnetic fields ...
Pedro Albizu Campos - Later Years and Death
... He alleged that he was the subject of human radiation experiments in prison and stated that he could see colored rays bombarding him ... his head in order to shield himself from the radiation, the prison guards ridiculed him as El Rey de las Toallas (The King of the Towels) ... - but many doctors were able to examine Albizu, and test him for signs of radiation ...
Background - Physics and Science
... a condition in theoretical physics Background noise Background radiation, the natural radiation that is always present in a location Cosmic microwave background radiation, a natural constant radiation ...

More definitions of "radiation":

  • (noun): Energy that is radiated or transmitted in the form of rays or waves or particles.
  • (noun): The spread of a group of organisms into new habitats.
  • (noun): Syndrome resulting from exposure to ionizing radiation (e.g., exposure to radioactive chemicals or to nuclear explosions); low doses cause diarrhea and nausea and vomiting and sometimes loss of hair; greater exposure can cause sterility and cataracts and some forms of cancer and other diseases; severe exposure can cause death within hours.
    Example: "He was suffering from radiation"
    Synonyms: radiation sickness, radiation syndrome
  • (noun): The spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay.
    Synonyms: radioactivity
  • (noun): A radial arrangement of nerve fibers connecting different parts of the brain.

Famous quotes containing the word radiation:

    There are no accidents, only nature throwing her weight around. Even the bomb merely releases energy that nature has put there. Nuclear war would be just a spark in the grandeur of space. Nor can radiation “alter” nature: she will absorb it all. After the bomb, nature will pick up the cards we have spilled, shuffle them, and begin her game again.
    Camille Paglia (b. 1947)