Determining P/sub ion/, the correction factor for recombination losses in an ionization chamber

Journal Article · Thu Nov 01 04:00:00 EST 1984 · Med. Phys.; (United States)

OSTI ID:5992458

Weinhous, M S; Meli, J A

The 1983 AAPM protocol for the determination of absorbed dose from high-energy photon and electron beams recommends using P/sub 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/sub ion/. Computer programs, quadratic approximations, and data tables are presented to facilitate the determination of P/sub ion/ for continuous, pulsed, and pulsed-swept beams.

• Research Organization: Department of Therapeutic Radiology, Yale University School of Medicine, New Haven, Connecticut 06510
• OSTI ID: 5992458
• Journal Information: Med. Phys.; (United States), Journal Name: Med. Phys.; (United States) Vol. 11:6; ISSN MPHYA
• Country of Publication: United States
• Language: English

Related Subjects

07 ISOTOPE AND RADIATION SOURCES
440102 -- Radiation Instrumentation-- Radiation Dosemeters
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
655002* -- Medical Physics-- Radiation Source Calibration & Standardization
CHARGED PARTICLES
DOSE RATES
DOSIMETRY
ELECTRON DOSIMETRY
ENERGY LOSSES
GAMMA DOSIMETRY
IONIZATION CHAMBERS
IONS
LOSSES
MEASURING INSTRUMENTS
RADIATION DETECTORS
RECOMBINATION
STANDARDS
X-RAY DOSIMETRY