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Related to radiation intensity: directivity
radiation intensity[‚rād·ē′ā·shən in‚ten·səd·ē]
The power radiated from an antenna per unit solid angle in a given direction.
The quantity of radiant energy passing perpendicularly through a specified location of unit area in unit time; reported as a number of particles or photons per square centimeter per second, or in energy units such as ergs per square centimeter per second.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.