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Determination of the kerma factors in tissue‐equivalent plastic, C, Mg, and Fe for 14.7‐MeV neutrons
Author(s) -
Wuu C. S.,
Milavickas L. R.
Publication year - 1987
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 - 10.1118/1.596116
Subject(s) - kerma , neutron , fluence , materials science , ionization chamber , dosimetry , irradiation , stopping power , equivalent dose , ionization , nuclear physics , proportional counter , neutron flux , neutron temperature , radiochemistry , physics , atomic physics , analytical chemistry (journal) , nuclear medicine , detector , chemistry , optics , ion , medicine , chromatography , quantum mechanics
Microdosimetric measurements were made with tissue‐equivalent plastic, (TEP), C‐, Mg‐, and Fe‐walled proportional counters filled with propane‐based tissue equivalent (TE) gas and Ar gas and irradiated with 14.7‐MeV neutrons. A theoretical model was used for the analysis of energy deposition in spherical detectors. An effective average mass stopping‐power ratio and a W correction were calculated to convert the gas ionization to the kerma in the wall material. The neutron fluence at the position of microdosimetric measurements was determined with an associated particle chamber mounted with surface barrier detectors. The experimental measurements along with the calculated correction factors yielded kerma factors of 0.660×10 − 8 cGy cm 2 for TEP, 0.219×10 − 8 cGy cm 2 for C, 0.122×10 − 8 cGy cm 2 for Mg, and 0.479×10 − 9 cGy cm 2 for Fe. The estimated uncertainties are 8.0% for TEP, 10.5% for C, and 9.3% for Mg and Fe.