ra·di·a·tion /ˌrediˈeʃən/
 放射,發射;放射物;散熱器;射線療法
 ra·di·a·tion /ˌredɪˈeʃən/ 名詞
 輻射,放射
 radiation
 輻射
 Ra·di·a·tion n.
 1. The act of radiating, or the state of being radiated; emission and diffusion of rays of light; beamy brightness.
 2. The shooting forth of anything from a point or surface, like the diverging rays of light; as, the radiation of heat.
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 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" [syn: radiation
         sickness, radiation syndrome]
      4: the spontaneous emission of a stream of particles or
         electromagnetic rays in nuclear decay [syn: 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 radiation from a radioactive substance [syn: radiotherapy,
          radiation therapy, actinotherapy, irradiation]