Simulation Study On Shielding Property Of Anti-Radiation Materials Used On Nuclear Rescue Robots

Rescue robots are very important for nuclear power plant operation, especially at accidents case. The electronic devices are quite sensible to the nuclear radiation, which can be quickly destroyed. Shielding and encapsulation can enhance the anti-radiation properties. In this thesis, shielding property of different heavy metals and alloys were simulated by MCNP software with Monte Carlo method. The properties of Ni-W, W-Ni and their alloys were compared. The effects of tungsten particle size and particle arrangement form in tungsten polyethylene were studied. As a result, the following conclusions are obtained:First, tungsten shows the best per thickness y-ray shielding property among lead, tungsten, tantalum, iron and barium. Lead owns the best per weight shielding property, tungsten and tantalum are below lead.Second, among Ni-W combination, W-Ni combination and their alloys, Ni-W combination shows the best property, the next is W-Ni alloy. Energy spectrum of W-Ni combination is higher than the other two models (mainly from0to0.6MeV). With the increase of tungsten content, the shielding property of W-Ni combination approach to that of Ni-W combination. It’s found that the shielding property of Ni-W combination does not improve with the number of Ni-W layers increase.Third, in repeated arrangement form of tungsten polyethylene composite material, shielding property with small tungsten particle size type is better than the big one from0to0.5MeV y-ray, but show the same shielding property from0.5to1MeV; in interval arrangement model, the property of small tungsten particle size is better than the big one in the whole range from0to1MeV γ-ray.Fourth, at a certain thickness and radiation intensity of heavy metal particle composite, the shielding property of repeated arrangement model is better than the interval one. While the property gap between two models got decreased with the increase of y-ray energy. Energy spectrum of three models are the same variation tendency when the radiation energy achieved0.5MeV.