摘要
用多箔活化法测定铀氢锆脉冲堆辐照腔脉冲工况下的中子注量 ,选用了 2 1种非裂变箔。其中 5种是热区的 ,5种是中能区的 ,1 1种是快区的 ,给出了箔的特性参数。通过测定各箔的活化率 ,运用迭代法中的直接偏差最小法和应用较广的SAND Ⅱ ,求解了辐照腔待测点全能区 (1 0 -4 eV～ 1 8MeV)微分和积分中子注量谱。用求解的微分中子注量计算了 0 5MeV和 1MeV以上的阈探测器的平均截面 。
Neutron fluence of pulsed condition in irradiation chamber of UZrH pulsed reactor is measured with multiple foil activation technique.21 kinds of non-fission foils were selected.Of which 5 were sensitive to thermal energy region,5 sensitive to intermediate energy region,and 11 with different threshold energy sensitive to fast energy region.By measuring the foils activity,the integral and differential neutron fluence spectra of the whole energy range(10 -4 eV～18 MeV)in irradiation chamber were available with SAND-Ⅱ used broadly at home and abroad and the method for minimizing directed divergence. With the solution differential neutron fluence spectra,the spectrum-averaged cross section values above 0.5 MeV and 1 MeV of threshold foils were calculated.The main factors which have influence on the accuracy of the solution were studied.
出处
《核科学与工程》
CSCD
北大核心
2002年第4期374-379,共6页
Nuclear Science and Engineering
