【摘要】 利用MCNPX模拟计算了在三种几何辐照条件下和四种典型中子源入射时的单球中子谱仪的能量响应,模拟计算结果表明:当中子能量大于1Me V时,能量响应满足各向同性;当中子能量小于1Me V时,位于单球浅层的探测器响应各向同性变差。241Am-Be中子源和252Cf中子源入射时,单球中子谱仪响应不受几何辐照条件影响,当中子源包含有热中子,超热中子和慢中子时,位于单球谱仪浅层的探测器能量响应因几何辐照条件不同而有差异。更多还原

【Abstract】 With the use of MCNPX,the energy response of a single sphere neutron spectrometer exposed under three geometric irradiation conditions and irradiated by four kinds of typical neutron sources has been calculated.The results showed that the neutron spectrometer has isotropic response when the energy of incident neutrons is higher than 1 MeV,and it has relatively worse isotropic response when the energy of incident neutrons is lower than 1 MeV.When exposed by ²⁴¹Am-Be and ²⁵²Cf neutron sources,the energy response of the single sphere neutron spectrometer is insusceptible to different geometric irradiations.However,when the neutron sources contain thermal neutrons,epithermal neutrons or slow neutrons,the response of detectors located in the shadow layer of the sphere becomes sensitive to the geometric irradiations.更多还原