单词	radiation
释义	radiation noun ra·​di·​a·​tion ˌrā-dē-ˈā-shən  1 a : the action or process of radiating b : the process of emitting radiant energy in the form of waves or particles c(1) : the combined processes of emission, transmission, and absorption of radiant energy (2) : the transfer of heat by radiation compare conduction, convection 2 a : something that is radiated b : energy radiated in the form of waves or particles 3 : radial arrangement 4 : adaptive radiation radiational ˌrā-dē-ˈā-shnəl  -shə-nᵊl adjective radiationless ˌrā-dē-ˈā-shən-ləs  adjective radiative ˈrā-dē-ˌā-tiv  adjective Example Sentences She was exposed to high levels of radiation. He goes in for radiation next week. the sun's radiation of heat Recent Examples on the Web That hope had sustained them as Zach endured hours in chemotherapy infusion chairs, through rounds of radiation, and during several hospitalizations. S. Monica Soni, STAT, 6 Sep. 2022 The two other manikins — named Helga and Zohar — are torsos made from materials simulating the soft tissue, bones, and organs of women and designed to measure the effect of radiation on bodies in space. Catherine Garcia, The Week, 29 Aug. 2022 The batch releases from the pools may likely have higher levels of radiation. Rob Nikolewski, San Diego Union-Tribune, 26 Aug. 2022 Though uncrewed, the Artemis I mission will carry three test manikins in the Orion crew module to measure stresses and the effects of radiation during its trip to lunar orbit, returning to Earth 42 days later. Alan Taylor, The Atlantic, 24 Aug. 2022 But there is still really strong anti-nuclear sentiment: fears of radiation, fears of what would happen in an earthquake. Los Angeles Times, 19 Aug. 2022 According to some approaches to Orch OR theory, the superposition collapse mechanism underlying it should cause the spontaneous emission of a tiny amount of radiation. Robert Lea, Popular Mechanics, 16 Aug. 2022 For four decades, communities, including many Indigenous ones, have been exposed to unhealthy levels of radiation left over from uranium ore extraction and refining efforts that have long since ceased. Ellen Mcgirt, Fortune, 12 Aug. 2022 Its radioactive particles decay in the lungs, releasing small bursts of radiation. Maya Miller, ProPublica, 8 Aug. 2022 See More Word History First Known Use 15th century, in the meaning defined at sense 1a Phrases Containing radiation adaptive radiation Cerenkov radiation anti-radiation secondary radiation electromagnetic radiation synchrotron radiation background radiation radiation sickness radiation therapy cosmic background radiation gravitational radiation x-radiation gamma radiation See More adaptive radiation Cerenkov radiation anti-radiation secondary radiation electromagnetic radiation synchrotron radiation background radiation radiation sickness radiation therapy cosmic background radiation gravitational radiation x-radiation gamma radiation See More Kids Definition radiation noun ra·​di·​a·​tion ˌrā-dē-ˈā-shən  1 : the process of giving off energy in the form of waves or particles 2 : something that is radiated (as light or X-rays) Medical Definition radiation noun ra·​di·​a·​tion ˌrād-ē-ˈā-shən  1 : energy radiated in the form of waves or particles 2 a : the action or process of radiating with radiation of the pain there may be tenderness over the sciatic nerve J. A. Key b(1) : the process of emitting radiant energy in the form of waves or particles (2) : the combined processes of emission, transmission, and absorption of radiant energy 3 : a tract of nerve fibers within the brain especially : one concerned with the distribution of impulses arising from sensory stimuli to the relevant coordinating centers and nuclei the optic radiations
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