M‐C Simulation On Compound Materials Shielding14MeV Neutron Source

14MeV neutron,reduced by T(d,n)4He reaction,has been used widely. It has beenused in fast neutron photography, fast neutron activation analysis,nuclear reaction crosssection data measurement, radiation breeding,neutron logging,material radiation damagestudy,fast neutron treatment of cancer. In this paper, we use the MCNP5program tosimulate transport of14MeV neutron in shielding materials, and seek optimizationshielding methods for14MeV neutron. Here is the main contents and results:1、We study the shielding function ofiron, austenitic stainless steel, gadolinium-containing stainless steel,boron carbide,and polyethylene on the14MeV,5MeV,2.2MeV,0.1MeV,100eV neutron. The results show that: when the neutron energy is higher,theshielding effect of heavy nuclei is better, and when the neutron energy is lower, theshielding effect of the light nuclei is better.2、We study layered materials of iron and polyethylene’s shielding function for14MeVneutron, and compare it with a single iron or polyethylene ‘s. The results showed that theshielding function which the heavy nuclei lay before the light nuclei is much better thanthat of a single shielding material or the light nuclei lay before the heavy nuclei.3、 We designed the layered shield to shield14MeV netron.(1) When the first shielding layer are iron, austenitic stainless steel, andgadolinium-containing stainless steel, we calculate the thickness of each material.The results show that the suitable thickness of three materials are about36cm.(2) When the second shielding layer are polyethylene, polyethylene doped with20%boron carbide, polyethylene doped with50%boron carbide, we calculate thethickness of each material. The results show that: the suitable thickness ofpolyethylene is12cm, the suitable thickness of polyethylenes doped with boroncarbide are8cm. In addition, we conclude that the polyethylene doped with boroncarbide is better than pure polyethylene in shielding function, but the proportion Boron carbide is not the higher the better, when the proportion Boron carbide iscertain value, the shielding function is best.