Neutrons reflected by the cement material were studied by nuclear fission and activation methods with a D-T neutron source.With the small enriched uranium and depleted uranium fission ionization chambers combining to the capturing detector

the 235U(wrapped by Cd foil) and 238U fission reaction rates induced by reflected neutrons are measured on the horizontal equator of the Fe shell’s outer surface.The standard experimental uncertaininties of fission reaction rates were 6.1%~ 7.3% for 235U(wrapped by Cd foil) and 6.4%~ 7.4% for 238U.With five kinds of activation foils of different threshould energy

the 56Fe

27Al

93Nb

19F and 63Cu reaction rates induced by reflected neutrons were measured.The standard experimental uncertaininties of activation reaction rates were 7.2%~ 8.0%.The 235U(wrapped by Cd foil) fission reaction rates with a 252Cf neutron source were compared to the ones with a D-T neutron source.The experimental results were discussed and analyzed.