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Displacement correction factor for fast‐neutron dosimetry in a tissue‐equivalent phantom
Author(s) -
Shapiro P.,
Attix F. H.,
August L. S.,
Theus R. B.,
Rogers C. C.
Publication year - 1976
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 - 10.1118/1.594208
Subject(s) - imaging phantom , dosimetry , ionization chamber , neutron , displacement (psychology) , nuclear medicine , physics , beam (structure) , materials science , neutron radiation , optics , nuclear physics , ion , medicine , ionization , psychology , quantum mechanics , psychotherapist
The displacement correction factor to be used for analysis of fast‐neutron dosimetric measurements using air‐filled EG and G tissue‐equivalent ion chambers in a tissue‐equivalent phantom has been investigated using the MANTA neutron radiotherapy beam generated by 35‐MeV deuterons on a thick Be target. The displacement correction factor inferred from these measurements is 0.970 for the EG and G IC‐17 (1.0‐cm 3 ) ion chamber, and is 0.989 for the EG and G IC‐18 (0.1‐cm 3 ) ion chamber. This multiplicative displacement correction factor has no significant dependence on depth in the phantom or on neutron beam size.