γ辐射场中TEPC微剂量谱的测量与模拟

Measurement and Simulation of TEPC Microdosimetric Spectra in Gamma Radiation Field

组织等效正比计数器(TEPC)所测中子、γ辐射的微剂量谱体现出不同的特征,可对中子、γ混合辐射场剂量当量份额进行区分。对中子、γ辐射剂量当量分辨方法进行研究,在60 Co、137 Csγ参考辐射场测量纯γ辐射的微剂量谱。采用FLUKA程序,模拟TEPC在多个单能点γ辐射场的微剂量谱。结果表明,60 Co、137 Csγ参考辐射场测量的微剂量谱与蒙特卡罗模拟的微剂量谱均体现了γ辐射的特征即线能基本低于10keV/μm,是进行中子、γ辐射剂量当量贡献分辨的基础。

According to the different characteristics of microdosimetric spectra measured by tissue equivalent proportional counter （TEPC）, the neutron dose equivalent and γ dose e- quivalent 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 γmicrodosimet- ric spectra was measured in60Co, 137Cs radionuclide radiation field with TEPC. TEPC mi- crodosimetric spectra in a series of monoenergy γ radiation field were simulated by FLUKA code. All the 3＇ 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/tam. This trait is the very foun- dation to discriminate the γ radiation from the mixed radiation.