活化法测量CFBR-II堆中子注量和中子能谱

Neutron Spectra and Fluence of CFBR-II Reactor Measured by Foils Activation Technique

采用活化法研究了CFBR-II堆中子能谱、中子注量分布和辐照样品对中子场的扰动。建立了用于求解中子能谱的SAND-II解谱程序。对实验结果的分析表明,活化法得到的中子注量率与裂变室得到的结果是一致的,辐照样品对中子能谱有一定的软化。

The neutron fluence and neutron spectra of CFBR-II (China Fast Burst Reactor II) has been measured by the foils activation technique. SAND-II method is used to unfold neutron spectra. The perturba-tion of the irradiation samples to the neutron spectra are studied. It shows that the irradiation sample can slow down the neutron energy. The neutron fluence measured by this method is coincident with the neutron flu-ence measured by 239Pu fission chamber.