A sign warns of radiation.
- 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.
- 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 of radiationClassical Latin radiatio
- The act or process of radiating: the radiation of heat and light from a fire.
- Physics a. Emission or propagation of energy in the form of waves or particles.b. Energy radiated or transmitted in the form of waves or 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.
- Adaptive radiation
- ra′di·a′tion·al, ra′di·a′tive
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.
From Latin radiatio.