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Comparisons of electron beam dose measurements in water and polystyrene using various dosimeters
Author(s) -
Kase Kenneth R.,
Adler Gary J.,
Bjärngard Bengt E.
Publication year - 1982
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 - 10.1118/1.595055
Subject(s) - dosimeter , ionization chamber , percentage depth dose curve , absorbed dose , ionization , dosimetry , dose profile , materials science , polystyrene , water equivalent , thermoluminescence , equivalent dose , nuclear medicine , radiochemistry , chemistry , physics , ion , optoelectronics , medicine , organic chemistry , composite material , meteorology , snow , polymer , luminescence
A comparison has been made of central axis percent depth dose and absorbed dose in electron beams of 7.8 and 10.2 MeV, measured with devices of differing geometry and construction. Flat and cylindrical ionization chambers have been used as well as thin thermoluminescent dosimeters. The ionization chambers had walls of air equivalent or tissue equivalent plastic. Results indicate that central axis depth dose measurements are independent of measuring device. No significant difference was found among the various ionization chambers with air equivalent walls in the determination of absorbed dose. The dose determined by the tissue‐equivalent wall chamber was about 3% higher than the dose determined by the other ionization chambers. Dose maximum on the central axis in water is about 4% greater than when this same quantity is calculated from data measured in polystyrene.