Measurement and Simulation of TEPC Microdosimetric Spectra in Gamma Radiation Field

According to the different characteristics of microdosimetric spectra measured by tissue equivalent proportional counter (TEPC), the neutron dose equivalent and γ dose equivalent could be distinguished in a unknown neutron and γ mixed radiation field. In order to discriminate the γ radiation dose equivalent from the total value，the pure γ microdosimetric spectra was measured in ⁶⁰Co、¹³⁷Cs radionuclide radiation field with TEPC. TEPC microdosimetric spectra in a series of monoenergy γ radiation field were simulated by FLUKA code. All the γ radiation microdosimetric spectra, including measured spectrum in ⁶⁰Co、¹³⁷Cs radiation field and that of simulation spectrum by FLUKA code, reveal a trait that the linear energy of γ radiation is basically lower than 10 keV/μm. This trait is the very foundation to discriminate the γ radiation from the mixed radiation.