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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
    Radiation is often categorized as either ionizing or non-ionizing depending on the energy of the radiated particles Ionizing radiation carries more than 10 electron volts (eV), which is enough to ionize atoms and molecules and break chemical bonds This is an important distinction due to the large difference in harmfulness to living organisms
  • 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 This article delineates the properties and behaviour of radiation
  • 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 can come from unstable atoms or it can be produced by machines There are two kinds of radiation; ionizing and non-ionizing radiation Learn about alpha, beta, gamma and x-ray radiation
  • What is Radiation? - International Atomic Energy Agency
    Health: thanks to radiation, we can benefit from medical procedures, such as many cancer treatments, and diagnostic imaging methods Energy: radiation allows us to produce electricity via, for example, solar energy and nuclear energy Environment and climate change: radiation can be used to treat wastewater or to create new plant varieties that are resistant to climate change Industry and
  • Radiation Therapy for Cancer - NCI
    Radiation therapy is a type of cancer treatment that uses high doses of radiation to kill cancer cells and shrink tumors Learn about the types of radiation, why side effects happen, which ones you might have, and more
  • Radiation and Your Health | CDC
    Learn about what radiation is and the many sources of radiation in our lives
  • About Health Effects of Radiation | Radiation and Your Health | CDC
    By measuring radiation and understanding its health effects, we can work safely around it The radiation dose, or the amount of radiation, is critical to determining the health consequences of radiation
  • What Are The Different Types of Radiation? - NRC
    There are four major types of radiation: alpha, beta, neutrons, and electromagnetic waves such as gamma rays They differ in mass, energy and how deeply they penetrate people and objects The first is an alpha particle These particles consist of two protons and two neutrons and are the heaviest type of radiation particle
  • Acute radiation syndrome - Wikipedia
    Acute radiation syndrome (ARS), also known as radiation sickness or radiation poisoning, is a collection of health effects that are caused by being exposed to high amounts of ionizing radiation in a short period of time [1] Symptoms can start within an hour of exposure, and can last for several months [1][3][5] Early symptoms are usually nausea, vomiting and loss of appetite [1] In the





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