radio reflector

astronomical telescope that picks up electromagnetic radiations in the radio-frequency range from extraterrestrial sources ;

radio set

an electronic receiver that detects and demodulates and amplifies transmitted signals ;

radio signal

a radio wave used to transmit and receive messages ;

radio source

an object that radiates radio waves ;

radio spectrum

the entire spectrum of electromagnetic frequencies used for communications; includes frequencies used for radio and radar and television ;

radio station

station for the production and transmission of radio broadcasts ;

radio telescope

astronomical telescope that picks up electromagnetic radiations in the radio-frequency range from extraterrestrial sources ;

radio transmitter

transmitter that is the part of a radio system that transmits signals ;

radio wave

an electromagnetic wave with a wavelength between 0.5 cm to 30,000 m ;

radioactive dating

measurement of the amount of radioactive material (usually carbon 14) that an object contains; can be used to estimate the age of the object ;

radioactive decay

the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation ;

radioactive dust

the radioactive particles that settle to the ground after a nuclear explosion ;

radioactive iodine excretion test

radioactive iodine test that measures the amount of radioactive iodine excreted in the urine ;

radioactive iodine test

test of thyroid function in which the patient is give an oral does of radioactive iodine-131 ;

radioactive iodine uptake test

radioactive iodine test that measures the amount of radioactive iodine taken up by the thyroid gland ;

radioactive material

material that is radioactive ;

radioactive waste

useless radioactive materials that are left after some laboratory or commercial process is completed ;

radioactivity

the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay ;

radioactivity unit

a measure of radioactivity ;

radiobiology

the branch of biology that studies the effects of radiation on living organisms ;

radiocarbon

a radioactive isotope of carbon ;

radiocarbon dating

a chemical analysis used to determine the age of organic materials based on their content of the radioisotope carbon-14; believed to be reliable up to 40,000 years ;

radiocarpal joint

a joint between the distal end of the radius and the proximal row of carpal bones ;

radiochemist

a chemist who specializes in nuclear chemistry ;

radiochemistry

the chemistry of radioactive substances ;

radiochlorine

a radioactive isotope of chlorine ;

radiocommunication

medium for communication ;

radiogram

a photographic image produced on a radiosensitive surface by radiation other than visible light (especially by X-rays or gamma rays) ; a message transmitted by wireless telegraphy ;

radiograph

a photographic image produced on a radiosensitive surface by radiation other than visible light (especially by X-rays or gamma rays) ;

radiographer

a person who makes radiographs ;

radiography

photography that uses other kinds of radiation than visible light ; the process of making a radiograph; producing an image on a radiosensitive surface by radiation other than visible light ;

radioimmunoassay

immunoassay of a substance that has been radioactively labeled ;

radioisotope

a radioactive isotope of an element; produced either naturally or artificially ;

radiolaria

marine protozoa ;

radiolarian

protozoa with amoeba-like bodies and radiating filamentous pseudopods ;

radiolocation

measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects ;

radiologic technologist

a scientist trained in radiological technology ;

radiologist

a medical specialist who uses radioactive substances and X-rays in the treatment of disease ;

radiology

(radiology) examination of the inner structure of opaque objects using X rays or other penetrating radiation ; the branch of medical science dealing with the medical use of X-rays or other penetrating radiation ;

radiolysis

molecular disintegration resulting from radiation ;