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Radio Frequency (Rf): An alternating current or voltage with a frequency (or carrier wave) above about 100khz. It's called radio frequency because these frequencies have a capacity to be radiated as electromagnet . . . View Full Definition

Radioisotope: Term applied to a radioactive isotope, such as carbon-14 or uranium 238. Radioisotope nuclei are unstable and spontaneously breakdown and emit one of a number of types of radiation.

Radiography: Technique of using x-rays, gamma rays and charged particles to form shadow images on photographic materials. Used in medical and industrial research because of its ability to penetrate opaqu . . . View Full Definition

Radiolaria: Protistan phylum, whose members are planktonic and secrete an often elaborate siliceous test

Radiolarian Ooze: A deep-sea pelagic sediment that contains at least 30% siliceous radiolarian remains.

Radiolarite: The lithified sedimentary rock formed from radiolarian ooze.

Radiocarbon Technique: The estimation of primary productivity by the measurement of radiocarbon uptake

Radiolarian: A group of one-celled marine animals with a siliceous skeleton that occupies shallow portions of the water column. Radiolarians have a range from Cambrian to present.

Radioactive Decay: The spontaneous decay of an atom to an atom of a different element by emission of a particle from its nucleus (alpha and beta decay) or by electron capture.

Radio Frequency Interference (RFI): A high-frequency signal radiated by improperly shielded conductors. RFI can interfere with the operation of other electronic devices.