the electromagnetic radiation that would be radiated from an ideal black body; the distribution of energy in the radiated spectrum of a black body depends only on temperature and is determined by Planck's radiation law
obtaining images by the use of X rays
energy that is radiated or transmitted in the form of rays or waves or particles
the act of spreading outward from a central source
a hypothetical object capable of absorbing all the electromagnetic radiation falling on it
the spread of a group of organisms into new habitats
(medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance
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
a radial arrangement of nerve fibers connecting different parts of the brain
the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay
