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Determinations of N gas and P repl factors from commercially available parallel‐plate chambers: AAPM Task Group 21 protocol
Author(s) -
Kubo H.,
Kent L. J.,
Krithivas G.
Publication year - 1986
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 - 10.1118/1.595968
Subject(s) - ionization chamber , task group , calibration , dosimeter , physics , dosimetry , electron , nuclear medicine , atomic physics , nuclear physics , materials science , radiation , ionization , ion , medicine , engineering management , quantum mechanics , engineering
Using a Farmer chamber as a reference dosimeter, we have measured the N gas (cavity‐gas calibration factor) and P repl (replacement correction factor) values for four parallel‐plate chambers: (1) a Holt chamber, (2) a Capintec chamber, (3) a Markus chamber, and (4) an SHM chamber. N gas determinations were done primarily using 6 0 Co photons and nominal 18‐MeV electrons for N gas determinations. For P repl determinations, we used nominal 18‐, 15‐, 12‐, 9‐, 6‐, and 4‐MeV electrons.