focal spot

(redirected from focal spot-film distance)
Also found in: Medical.

focal spot

[′fō·kəl ‚spät]
(metallurgy)
In electron-beam or laser welding, the spot where the beam has the highest concentrated energy level.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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