the act of spreading outward from a central source | (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance |
(medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance | the apparent enlargement of a bright object when viewed against a dark background |
a radial arrangement of nerve fibers connecting different parts of the brain | (Pavolvian conditioning) the elicitation of a conditioned response by stimulation similar but not identical to the original stimulus |
the spread of a group of organisms into new habitats | (physiology) the spread of sensory neural impulses in the cortex |
energy that is radiated or transmitted in the form of rays or waves or particles | a column of light (as from a beacon) |
the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay | the condition of being exposed to radiation |
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 | |