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A simple method of producing depth ionization data for electron energy constancy check
Author(s) -
Islam Mohammad K.,
Rashid Harunor,
Gaballa Hani,
Ting Joseph,
Rosenow Ulf F.
Publication year - 1993
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 - 10.1118/1.597083
Subject(s) - ionization , imaging phantom , detector , wedge (geometry) , electron , linear particle accelerator , ionization chamber , optics , physics , computational physics , materials science , atomic physics , nuclear physics , beam (structure) , ion , quantum mechanics
A simple method has been developed to reproduce depth ionization data of electron beams for energy determination. The method utilizes a simple set of equipment, a combination of a specially designed wedge‐shaped polystyrene phantom and a linear array of detectors, to collect the necessary data. The wedge‐shaped phantom provides varying depths to various detectors in the array. The ionization readings received from the detectors were corrected for off‐axis ratio and plotted against corresponding ray‐line depths to produce depth ionization curves. The instrument setup was fast and simple. The relevant data, for a high‐energy linear accelerator with multiple electron energies, were collected in minutes. The depths of 80% and 50% ionization determined by this method were found to differ by 2 and 3 mm, respectively, at the most, with those determined by a conventional method.