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the energy transmitted in the form of particles or waves through the space or a matter
the act of spreading outward from a central source
(medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance
a radial arrangement of nerve fibers connecting different parts of the brain
the spread of a group of organisms into new habitats
the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay
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
