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Determining P ion , the correction factor for recombination losses in an ionization chamber
Author(s) -
Weinhous Martin S.,
Meli Jerome A.
Publication year - 1984
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.595574
Subject(s) - ionization chamber , ionization , pion , physics , photon , atomic physics , nuclear physics , ion , optics , quantum mechanics
The 1983 AAPM protocol for the determination of absorbed dose from high‐energy photon and electron beams recommends using P ion (the reciprocal of collection efficiency), as determined by the two‐voltage technique, to correct for recombination losses in ionization chambers. Methods and data for the determination of ionization chamber collection efficiencies are scattered throughout the literature. The present work consolidates the available information, rectifies certain omissions, and provides several convenient and readily implemented methods for determining P ion . Computer programs, quadratic approximations, and data tables are presented to facilitate the determination of P ion for continuous, pulsed, and pulsed‐swept beams.