<HEAD><TITLE>DICTIONARY: radio frequency - radionuclide</TITLE></HEAD>
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<A NAME="radiofrequency">
<B>radio frequency,</B><DL COMPACT><DD><B> 1. </B>any electromagnetic wave frequency suitable for radio broadcasting, usually above 15,000 cycles per second. <BR> <I>Ex. Techniques using radio frequencies are therefore the method par excellence for studying low-energy transitions in atoms and molecules (J. Little).</I> <DL COMPACT><DD> (Abbr:) RF (no periods). <DD><B> 2. </B>the frequency of the waves which transmit a particular radio broadcast. adj. <B>radiofrequency.</B> </DL>
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<A NAME="radiogalaxy">
<B>radio galaxy,</B><DL COMPACT><DD> a galaxy that emits radio waves. <BR> <I>Ex. It seemed likely ... that most radio sources in space ... were remote radio galaxies which emitted vast amounts of energy by unknown mechanisms (London Times).</I> </DL>
<A NAME="radiogenic">
<B>radiogenic, </B>adjective.<DL COMPACT><DD><B> 1. </B>formed as a product of radioactivity. <BR> <I>Ex. radiogenic isotopes, radiogenic elements.</I> <DD><B> 2. </B>suitable for radiobroadcasting. </DL>
<A NAME="radiogeology">
<B>radiogeology, </B>noun.<DL COMPACT><DD> the branch of geology dealing with the relation of radioactivity to geology. </DL>
<A NAME="radiogold">
<B>radiogold, </B>noun.<DL COMPACT><DD> a radioisotope of gold, used in the treatment of cancer. </DL>
<B>radiogram</B> (2), noun.<DL COMPACT><DD> (British.) a radiogramophone. </DL>
<A NAME="radiogramophone">
<B>radiogramophone, </B>noun.<DL COMPACT><DD> (British.) a radio and phonograph combined in a single unit. </DL>
<A NAME="radiograph">
<B>radiograph, </B>noun, verb.<DL COMPACT><DD><I>noun </I> a picture produced by X rays or other rays on a photographic plate, commonly called an X-ray picture. <BR> <I>Ex. The radiograph was taken at the surgeon's request ... and two days later it was decided to operate (Science News).</I> <DD><I>v.t. </I> to make a radiograph of. <BR> <I>Ex. At this plant the company manufactures projectors for radiographing metals (Newsweek).</I> </DL>
<A NAME="radiographer">
<B>radiographer, </B>noun.<DL COMPACT><DD> a person skilled in radiography. </DL>
<A NAME="radiographic">
<B>radiographic, </B>adjective.<DL COMPACT><DD> of or having to do with radiographs or radiography. <BR> <I>Ex. a radiographic examination.</I> </DL>
<B>radiographically, </B>adverb.<DL COMPACT><DD> by radiography. </DL>
<A NAME="radiography">
<B>radiography, </B>noun.<DL COMPACT><DD> the production of images on sensitized plates by means of X rays. <BR> <I>Ex. A field in which radium and its daughter product radon have been used for some time is industrial radiography (Crammer and Peierls).</I> </DL>
<A NAME="radioheliograph">
<B>radioheliograph, </B>noun.<DL COMPACT><DD> a device for studying and measuring radio noise emitted by the sun. <BR> <I>Ex. The radioheliograph has ... recorded an explosion on the sun which is one million times bigger than a 70 megaton H-bomb (London Times).</I> </DL>
<A NAME="radioimmunoassay">
<B>radioimmunoassay, </B>noun.<DL COMPACT><DD> a method of assaying the amount or other characteristics of a substance by labeling it with a radioactive chemical and combining it with an antibody to induce an immunological reaction. <BR> <I>Ex. The availability of pure hormone has made possible the development of a very sensitive radioimmunoassay for the hormone (D. Harold Copp).</I> </DL>
<A NAME="radioimmunological">
<B>radioimmunological, </B>adjective.<DL COMPACT><DD> involving the use of radioimmunoassay. <BR> <I>Ex. Estimation of the concentration of peptide hormones in plasma can be made by radioimmunological techniques (John Watt McLaren).</I> </DL>
<A NAME="radioiodine">
<B>radioiodine, </B>noun.<DL COMPACT><DD> a radioisotope of iodine, used in the treatment of thyroid disorders; iodine 131. <BR> <I>Ex. A given amount of radioiodine ingested appears to deliver considerably more radiation to infant thyroids than to those of adults (Scientific American).</I> </DL>
<A NAME="radioiron">
<B>radioiron, </B>noun.<DL COMPACT><DD> a radioisotope of iron, used in studying hemoglobin and red blood cells, and various kinds of anemia characterized by iron deficiency. </DL>
<A NAME="radioisotope">
<B>radioisotope, </B>noun.<DL COMPACT><DD> a radioactive isotope, especially one produced artificially. <BR> <I>Ex. A million medical patients are being diagnosed or treated with radioisotopes each year (Bulletin of Atomic Scientists).</I> </DL>
<A NAME="radioisotopic">
<B>radioisotopic, </B>adjective.<DL COMPACT><DD> of or having to do with radioisotopes. <BR> <I>Ex. One satellite of each group had a radioisotopic nuclear generator (New Scientist).</I> adv. <B>radioisotopically.</B> </DL>
<A NAME="radiolabeled">
<B>radiolabeled, </B>adjective.<DL COMPACT><DD> labeled with a radioactive isotope or other radioactive substance. <BR> <I>Ex. Dr. Wall ... will use radiolabeled THC [tetrahydrocannabinol] in studies of metabolism and biological distribution (Science News).</I> </DL>
<A NAME="radiolarian">
<B>radiolarian, </B>noun, adjective.<DL COMPACT><DD><I>noun </I> any one of a large order of minute marine protozoans, often having a spherical body with numerous fine, radiating pseudopods and usually an outer spiny skeleton. <DD><I>adj. </I> of or belonging to the radiolarians. </DL>
<A NAME="radiolink">
<B>radio link,</B><DL COMPACT><DD> the part of a communication system which transmits messages by radio waves rather than by cables or wires. <BR> <I>Ex. Changes in a capacitance vary the frequency of a signal transmitted by radio link to the shore (New Scientist).</I> </DL>
<A NAME="radiolocation">
<B>radiolocation, </B>noun.<DL COMPACT><DD> (British.) the use of radar, sonar, and other electronic devices, to determine the position and course of an object. </DL>
<B>radiological, </B>adjective.<DL COMPACT><DD><B> 1. </B>of or having to do with radiology. <DD><B> 2. </B>of or having to do with the rays from radioactive substances. <BR> <I>Ex. A British physicist speculates on the composition and possible radiological effects of the superbomb tested in the Pacific last spring (Bulletin of Atomic Scientists).</I> adv. <B>radiologically.</B> </DL>
<A NAME="radiologist">
<B>radiologist, </B>noun.<DL COMPACT><DD> an expert in radiology. </DL>
<A NAME="radiology">
<B>radiology, </B>noun.<DL COMPACT><DD><B> 1. </B>the science dealing with X rays or the rays from radioactive substances, especially for medical diagnosis or treatment. <DD><B> 2. </B>the art of using X rays to examine, photograph, or treat bones, organs, or certain manufactured products. </DL>
<A NAME="radiolucency">
<B>radiolucency, </B>noun.<DL COMPACT><DD> the property of being radiolucent. </DL>
<A NAME="radiolucent">
<B>radiolucent, </B>adjective.<DL COMPACT><DD> permitting X rays and other forms of radiation to pass through; partly or wholly radiotransparent. </DL>
<A NAME="radiolysis">
<B>radiolysis, </B>noun.<DL COMPACT><DD> the chemical decomposition of a substance resulting from the action of radiation. <BR> <I>Ex. Organic fluids in the radioactive environment of a reactor are subject to radiolysis (Bulletin of Atomic Scientists).</I> </DL>
<A NAME="radiolytic">
<B>radiolytic, </B>adjective.<DL COMPACT><DD> having to do with or producing radiolysis. </DL>
<A NAME="radioman">
<B>radioman, </B>noun, pl. <B>-men.</B><DL COMPACT><DD><B> 1. </B>a member of the crew of a ship or aircraft in charge of sending and receiving radio messages. <DD><B> 2. </B>a person who works in radiobroadcasting. <BR> <I>Ex. A group of radiomen [tried] to find out if anyone was still listening to radio in the nation's TV areas (Time).</I> </DL>
<B>radiometer, </B>noun.<DL COMPACT><DD><B> 1. </B>an instrument used for indicating the transformation of radiant energy into mechanical force, consisting of an exhausted glass vessel containing vanes which revolve on an axis when exposed to light. <DD><B> 2. </B>an instrument based on the same principle, but used for detecting and measuring small amounts of radiant energy. </DL>
<A NAME="radiometric">
<B>radiometric, </B>adjective.<DL COMPACT><DD> having to do with the radiometer or with radiometry. </DL>
<A NAME="radiometrically">
<B>radiometrically, </B>adverb.<DL COMPACT><DD> by using radiometry. </DL>
<A NAME="radiometry">
<B>radiometry, </B>noun.<DL COMPACT><DD> the measurement of radiant energy. </DL>
<A NAME="radiomicrometer">
<B>radiomicrometer, </B>noun.<DL COMPACT><DD> a thermoelectric device for measuring minute changes in temperature. </DL>
<A NAME="radiomimetic">
<B>radiomimetic, </B>adjective.<DL COMPACT><DD> having an effect on living tissue almost identical with that of radiation. <BR> <I>Ex. a radiomimetic chemical, drug, or agent. The knowledge that substances can be "radiomimetic" is largely a product of World War II research in poison gases (Scientific American).</I> </DL>
<A NAME="radionavigation">
<B>radio navigation,</B><DL COMPACT><DD> navigation of an aircraft or ship with the aid of radio beacons, radiocompasses, loran, and other electronic navigational aids. </DL>
<A NAME="radionecrosis">
<B>radionecrosis, </B>noun, pl. <B>-ses.</B><DL COMPACT><DD> necrosis brought about by irradiation. </DL>
<A NAME="radionoise">
<B>radio noise,</B><DL COMPACT><DD> radio emission, especially from a radio star or pulsar, characterized by random or erratic changes of amplitude or frequency. </DL>
<A NAME="radionuclide">
<B>radionuclide, </B>noun.<DL COMPACT><DD> a nuclide that is radioactive. <BR> <I>Ex. The synthetic radioactive fallout is produced in a "hot" laboratory by processing the radionuclide, lanthanum 140 (Science News Letter).</I> </DL>
