radiation

发射，放射

辐射

放射物；辐射物

radiation

发散, 发光, 发热, 辐射, 放射, 放射线, 放射物

radiation

1. energy that is radiated or transmitted in the form of rays or waves or particles

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2. the act of spreading outward from a central source

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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"

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4. the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay

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5. the spread of a group of organisms into new habitats

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6. a radial arrangement of nerve fibers connecting different parts of the brain

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7. (medicine) the treatment of disease (especially cancer) by exposure to radiation from a radioactive substance

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