emittance(redirected from Beam emittance)
Also found in: Dictionary, Wikipedia.
The power radiated per unit area of a radiating surface. Also known as emissive power; radiating power.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The ratio of radiant flux emitted by a material to that emitted by a blackbody at the same temperature, under the same conditions.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.