title: Displacement correction factor for fast-neutron dosimetry in a tissue-equivalent phantom.
abstract: 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-cm3) ion chamber, and is 0.989 for the EG and G IC-18 (0.1-cm3 ion chamber. This multiplicative displacement correction factor has no significant dependence on depth in the phantom or on neutron beam size.
mesh_terms: D005214:Fast Neutrons; D008961:Models, Structural; D009502:Neutrons; D011879:Radiotherapy Dosage; D011882:Radiotherapy, High-Energy