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Response of tissue‐equivalent ionization chamber to l5‐MeV neutrons
Author(s) -
Barschall H. H.,
Goldberg E.
Publication year - 1977
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 - 10.1118/1.594310
Subject(s) - kerma , ionization chamber , calibration , fluence , ionization , neutron , neutron flux , dosimetry , physics , radiation , bragg peak , atomic physics , neutron temperature , materials science , nuclear physics , irradiation , nuclear medicine , ion , medicine , quantum mechanics
The calibration (in rad/nC) of an air‐filled tissue‐equivalent ionization chamber for neutrons of l5‐MeV average energy was determined by measuring absolute fluences and calculating the kerma per unit fluence. The neutron calibration determined from the γ‐ray calibration and application of the Bragg–Gray relation was found to be 4% higher than that based on the fluence measurement. Additional data were taken to obtain calibration factors with tissue‐equivalent gas; the same difference betwen the two methods was observed.