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Approximations to saturation curves in gas‐filled parallel‐plate ionization chambers
Author(s) -
Heese R. N.,
Podgorsak E. B.,
Fallone B. 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 - 10.1118/1.595935
Subject(s) - saturation (graph theory) , ionization , exponential function , ion , ionization chamber , nitrogen , atomic physics , saturation current , computational physics , range (aeronautics) , analytical chemistry (journal) , saturation vapor curve , materials science , physics , chemistry , mathematics , nuclear magnetic resonance , mathematical analysis , quantum mechanics , enzyme , chromatography , combinatorics , voltage , composite material
Saturation curves were measured for air and nitrogen in the exposure rate range from ∼1 to ∼500 R/min. Because of the differences between the ion–ion versus electron–ion recombination processes, the air and nitrogen saturation curves differ considerably even when measured under identical chamber and exposure rate conditions. A comparison between our experimental data and various approximations to saturation curves in air, developed by others, is given. It is then shown that the air saturation curve can be approximated by a sum of three simple exponential functions.