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N gas values of the Memorial parallel‐plate chambers determined in 60 Co and high‐energy electron beams
Author(s) -
Kubo Hideo
Publication year - 1991
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 - 10.1118/1.596668
Subject(s) - electron , atomic physics , physics , energy (signal processing) , nuclear physics , materials science , quantum mechanics
The cavity‐gas calibration factor N gas for Memorial parallel‐plate chambers was determined against calibrated Farmer chambers using two different calibration methods as suggested in the TG 21 protocol. These methods are: (a) 60 Co calibration at 5‐cm depth; and (b) high‐energy electron beam calibration. The N gas values determined from the 60 Co in‐phantom calibrations were approximately 1.9% higher than the values determined from the high‐energy electron beams.

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