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radiation    音标拼音: [r,edi'eʃən]
n. 放射,发射;放射物;散热器;射线疗法

放射,发射;放射物;散热器;射线疗法

radiation
辐射

radiation
n 1: energy that is radiated or transmitted in the form of rays
or waves or particles
2: the act of spreading outward from a central source
3: 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; "he was
suffering from radiation" [synonym: {radiation sickness},
{radiation syndrome}, {radiation}]
4: the spontaneous emission of a stream of particles or
electromagnetic rays in nuclear decay [synonym: {radiation},
{radioactivity}]
5: the spread of a group of organisms into new habitats
6: a radial arrangement of nerve fibers connecting different
parts of the brain
7: (medicine) the treatment of disease (especially cancer) by
exposure to a radioactive substance [synonym: {radiotherapy},
{radiation therapy}, {radiation}, {actinotherapy},
{irradiation}]

Radiation \Ra`di*a"tion\ (r[=a]`d[i^]*[=a]"sh[u^]n), n. [L.
radiatio: cf. F. radiation.]
1. The act of radiating, or the state of being radiated;
emission and diffusion of rays of light; beamy brightness.
[1913 Webster]

2. The shooting forth of anything from a point or surface,
like the diverging rays of light; as, the radiation of
heat.
[1913 Webster]

111 Moby Thesaurus words for "radiation":
X ray, actinic ray, actinism, arc lighting, asteroids, atomic beam,
atomic ray, attenuation, aurora particles, beam, beam of light,
black and white, blackout, broadcast, broadcasting, chiaroscuro,
circumfusion, contrast, cosmic particles, cosmic ray bombardment,
decorative lighting, diffraction, diffusion, dilution,
direct lighting, dispensation, dispersal, dispersion,
dissemination, dissipation, distribution, divergence,
electric lighting, emanation, emission, enlightenment, evaporation,
expansion, festoon lighting, floodlighting, fluorescent lighting,
fragmentation, gamma ray, gaslighting, gleam, glow lighting,
highlight, highlights, illumination, incandescent lighting,
indirect lighting, infrared ray, intergalactic matter,
invisible radiation, irradiance, irradiancy, irradiation, leam,
light, light and shade, light source, lighting, luminous energy,
meteor dust impacts, meteors, overhead lighting, patch, pencil,
peppering, photon, photosensitivity, propagation, publication,
radiance, radiancy, radiant energy, radiorays, radius, ray,
ray of light, ribbon, ribbon of light, scattering, scatterment,
shedding, shotgun pattern, sidelight, solar rays, sowing,
space bullets, spattering, splay, spoke, spot lighting, spread,
spreading, sprinkling, stage lighting, streak, stream,
stream of light, streamer, strewing, strip lighting, the bends,
tonality, ultraviolet ray, violet ray, visible radiation,
volatilization, weightlessness

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  • Radiation - Wikipedia
    In physics, radiation is the emission or transmission of energy in the form of waves or particles through space or a material medium [1][2] This includes: Radiation is often categorized as either ionizing or non-ionizing depending on the energy of the radiated particles
  • Radiation | Definition, Types, Effects, Facts | Britannica
    Radiation, flow of atomic and subatomic particles and of waves, such as those that characterize heat rays, light rays, and X rays All matter is constantly bombarded with radiation of both types from cosmic and terrestrial sources
  • What Is Radiation? Definition, Types, and Examples
    Radiation is energy in motion Learn the definition, types, benefits, risks, and measurement of radiation in science and everyday life
  • Radiation Basics | US EPA
    Radiation is energy It can come from unstable atoms that undergo radioactive decay, or it can be produced by machines Radiation travels from its source in the form of energy waves or energized particles There are different forms of radiation and they have different properties and effects
  • What is Radiation? - International Atomic Energy Agency
    Radiation is energy that moves from one place to another in a form that can be described as waves or particles We are exposed to radiation in our everyday life Some of the most familiar sources of radiation include the sun, microwave ovens in our kitchens and the radios we listen to in our cars
  • Radiation Explained: How It Works, Its Risks, and When Exposure Becomes . . .
    Radiation surrounds us daily, from natural background sources to medical imaging devices It is classified as ionizing, which can remove electrons from atoms, or non-ionizing, which lacks this
  • Radiation and Your Health | CDC
    Learn about strategies that can help you stay safe from radiation Learn about ionizing radiation and its medical applications such as diagnostic testing Learn about the potential health effects of radiation exposure Learn how to how to self-decontaminate after being exposed to radioactive material
  • Radiation - World Health Organization (WHO)
    Radiation is energy that travels in the form of waves or particles and is part of our everyday environment People are exposed to radiation from cosmic rays, as well as to radioactive materials found in the soil, water, food, air and also inside the body
  • Basics of Radiation - REAC TS
    Radiation is energy, in the form of particles or electromagnetic rays, released from radioactive atoms The three most common types of radiation are alpha particles, beta particles, and gamma rays
  • How Radiation Works - HowStuffWorks
    Radiation is the emission and transmission of energy in the form of electromagnetic waves or particles Radiation can be ionizing or nonionizing radiation, and only ionizing radiation has enough energy to potentially cause damage to cells and DNA





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