extrapolation ionization chamber
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extrapolation ionization chamber[ik‚strap·ə′lā·shən ‚ī·ə·nə′zā·shən ‚chām·bər]
An ionization chamber so designed that volume, electrode separation, or some other factor can be varied in suitable steps for measurement purposes; the resulting measured values are plotted in appropriate form and the desired result is obtained by extrapolation of the curve.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.