（20～400）MeV准单能中子参考辐射场的建立方法CSCD

为了满足对高能中子辐射场测量仪器进行校准的需要,必需建立20MeV以上的准单能中子参考辐射场.对国际上（20～400） MeV准单能中子参考辐射场的建立情况及建立方法进行了调研,可通过7Li（p,n）7Be反应获得该能区准单能中子场,中子束流轮廓可通过转换体和影像板进行测量,辐射场中子能谱可利用液体闪烁探测器或者238U裂变电离室通过飞行时间法进行测量,可建立高效率的反冲质子望远镜作为该能区的中子注量测量初级标准.

Quasi-monoenergetic Neutron Reference Fields with Energies from 20 MeV to 400 MeV

Quasi-monoenergetic reference neutron beams in the energy above 20 MeV have to be produced to satisfied the calibration for the response of the neutron detectors for the neutron field with high energy. The current status of the quasi-monoenergetic neutron reference fields in the energy range from 20 MeV to 400 MeV and the way how they were established were survyed on and reported in this pa- per, the reaction 7Li（p, n）7Be can be used as the quasi-monoenergetic neutron source in this energy range, the neutron beam profile can be measured with converter and imaging plate, the energy spectrum can be measured with organic liquid scintillation detector or the 238U fission chamber by TOF method, and the proton recoil telescope can be established as the primary instrument in this range.