- Radiation is the process of sending off energy in the form of light, heat, x-rays or nuclear particles.
- An example of radiation are the energy waves off of a nuclear bomb.
- An example of radiation is the energy in the atmosphere monitored by radiation detectors such as the Xetex brand of personal radiation detector which were ultimately discontinued in the 1990s.
A sign warns of radiation.
radiation definition by Webster's New World
- the act or process of radiating; specif., the process in which energy in the form of rays of light, heat, etc. is sent out through space from atoms and molecules as they undergo internal change
- the rays sent out; radiant energy
- radial arrangement of parts
- Biol. adaptive radiation
- Nuclear Physics energy emitted as electromagnetic waves, as gamma or X-rays, or as energetic nuclear particles, as neutrons, alpha and beta particles, etc.
Origin: Classical Latin radiatio
radiation definition by American Heritage Dictionary
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
- The act or process of radiating: the radiation of heat and light from a fire.
- Physics a. Emission and propagation and emission of energy in the form of rays or waves.b. Energy radiated or transmitted as rays, waves, in the form of particles.c. A stream of particles or electromagnetic waves emitted by the atoms and molecules of a radioactive substance as a result of nuclear decay.
- a. The act of exposing or the condition of being exposed to such energy.b. The application of such energy, as in medical treatment.
- Anatomy Radial arrangement of parts, as of a group of nerve fibers connecting different areas of the brain.
- a. The spread of a group of organisms into new habitats.b. Adaptive radiation.
- raˌdi·aˈtion·al, raˈdi·aˌtive adjective
radiation - Ologies & -Isms Definition
Ologies & -Isms. Copyright 2010 The Gale Group, Inc. All rights reserved.
See also physics.actinotherapy radiotherapy. bolograph the record produced by a bolometer. bolometer a device used in bolometry. bolometry the measurement of minute amounts of radiant energy, especially infrared spectra. —bolometrist, n. —bolometric, adj. curiescopy radioscopy. diathermancy the capacity to transmit infrared radiation. —diathermanous, adj. dosimeter a device, carried or worn by people working near radiation for measuring the amount of radiation to which they are exposed. dosimetry the measurement by a dosimeter of the dosage of radiation a person might have received. See also drugs. —dosimetrist, n. —dosimetric, dosimetrical adj. fluorometer an instrument for measuring the emission of radiation in the form of visible light and identifying the substance that is its source. —fluorometric, adj. fluorometry the measurement of fluorescence, or visible radiation, by means of a fluorometer. —fluorometric, adj. fluoroscopy an examination by means of a screen coated with a fluorescent substance responsive to radiation from x rays. —fluoroscopic, adj. metallography the study of metals and their structures and properties by the use of microscopy and x rays. pyelography the science or technique of making x-ray photographs of the kidneys, renal pelves, and ureters, using injection of opaque solutions or radiopaque dyes. —pyelographic, adj. radiesthesia the sensitivity of some humans to radiation of various kinds, as in water divining or nonmedical diagnosis. —radiesthetic, adj. radioactivity the state, property, or process of being radioactive. radiography the production of photographic images on film using radiation from other radioactive substances instead of light. Also called x-ray scotography, shadowgraphy. —radiograph, radiographer, n. —radiographic, radiographical, adj. radiology 1. the science that studies x rays or radiation from radioactive substances, esp. for medical purposes. 2. the examination or photographing of parts of the body with such rays. 3. the interpretation of the resulting photographs. —radiologist, n. —radiologie, radiological, adj. radiometallography the study of metals and their structures by the use of x rays. radioscopy the study or observation of the inner structure of opaque materials by means of x rays or other radioactive substances. Also called curiescopy. radiosensibility sensitivity to the effects of radiation, as of parts of the body. Also called radiosensitivity. radiosensitivity radiosensibility. —radiosensitive, adj. radiotechnology the science and technology of applying radiation and x rays to industrial use. See also radio. radiotherapy a method of treating diseases with x rays or the radiation from other radioactive substances. Also called actinotherapy. —radiotherapist, n. —radiotherapeutic, adj. roentgenism 1. the treatment of disease with x rays or roentgen rays. 2. the effect of misuse or overexposure to these rays. roentgenogram an x-ray photograph. roentgenography x-ray photography. scotograph a radiograph. shadowgraphy radiography. tomography x-ray photography of a selected plane of the body by a method that eliminates the outline of structures in other planes. —tomographic, adj. xeroradiography a process of recording x-ray images by electrostatic means. —xeroradiographic, adj. x-ray scotography radiography.
radiation - Computer Definition
Webster's New World Telecom Dictionary Copyright © 2010 by Wiley Publishing, Inc., Indianapolis, Indiana. Used by arrangement with John Wiley & Sons, Inc.
radiation - Cultural Definition
The New Dictionary of Cultural Literacy Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
radiation - Medical Definition
The American Heritage® Medical Dictionary Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
- The act or condition of diverging in all directions from a center.
- The emission and propagation of energy in the form of rays or waves.
- The energy radiated or transmitted in the form of rays, waves, or particles.
- A stream of particles or electromagnetic waves that is emitted by the atoms and molecules of a radioactive substance as a result of nuclear decay.
- The radial arrangement of anatomical or histological parts.
- The spread of a group of organisms into new habitats.
radiation - Science Definition
- a. Streams of photons, electrons, small nuclei, or other particles. Radiation is given off by a wide variety of processes, such as thermal activity, nuclear reactions (as in fission), and by radioactive decay.
- The use of such energy, especially x-rays, in medical diagnosis and treatment.