Modification of neutron response of a TE ionization chamber for radiological protection purpose

A tissue equivalent ionization chamber is applied in all known methods for measuring dose equivalent in mixed radiation fields. Most of the TE ionization chambers are not fully homogeneous. The deviation of a TE ionization chamber from homogeneity leads to inaccurate neutron dosimetry. It is shown that a controlled inhomogeneity of a TE gas filled cavity in a TE ionization chamber results in suitable modification of the response to neutrons particularly in a set of detectors consisting of a TE ionization chamber and an organic scintillation detector designed to determine dose equivalent index quantities of mixed radiation. The response of a TE chamber having infinite cavity filled with following gas mixtures: TE methane based composition, CH4 + N2 -TE only for hydrogen, CH4 + N2 + 3He -TE only for hydrogen was calculated for neutrons in the energy range from thermal to 1 MeV