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Ballanche, Pierre-Simon
(Encyclopedia) Ballanche, Pierre-SimonBallanche, Pierre-Simonpyĕr-sēmôNˈ bäläNshˈ [key], 1776–1847, French philosopher. A frequenter of Mme Récamier's salon, he was elected to the Académie française…radioactive dating
(Encyclopedia) radioactive dating: see dating.radioactive isotope
(Encyclopedia) radioactive isotope or radioisotope, natural or artificially created isotope of a chemical element having an unstable nucleus that decays, emitting alpha, beta, or gamma rays until…radioactive waste
(Encyclopedia) radioactive waste, material containing the unusable radioactive byproducts of the scientific, military, and industrial applications of nuclear energy. Since its radioactivity presents…radioactivity
(Encyclopedia) CE5 Effects of a magnetic field on the products of radioactivity CE5 Disintegration series: Radioactive decay of radium-226 into lead-206 radioactivity, spontaneous…radio altimeter
(Encyclopedia) radio altimeter: see altimeter.radio astronomy
(Encyclopedia) radio astronomy, study of celestial bodies by means of the electromagnetic radio frequency waves they emit and absorb naturally. Radio waves also come from outside the Milky Way.…radio beacon
(Encyclopedia) radio beacon: see radio range.radiochemistry
(Encyclopedia) radiochemistry, chemistry of radioactive substances (see radioactivity). Radioactive isotopes are very useful as tracers to study the mechanisms of complex organic reactions, since…Radio City
(Encyclopedia) Radio City: see Rockefeller Center.