Research On Monte Carlo Simulation Of Radiation Protection Material Based On Rubber

It is necessary to research radiation protection materials in order to avoid the harm of nuclear radiation to the environment and organisms.However,current research is mainly based on experiment,which is inefficient and the nuclear rays used in the experiment may cause harm to the experimenters.Therefore,in this paper,monte carlo method is used to study the effects of radiation protection materials based on rubber and structure on gamma ray and neutron.Gamma ray is set as the radiation source,rubber is material matrix and rare earth element compound is shielding filler.The results show that SBR has better attenuation capacity than EPDM,IIR,NBR and NR.La2O3 has better attenuation capacity than LaCl3?La2(CO3)3 and La(NO3)3.Increasing.the thickness or filler content can improve the shielding efficiency of the material.Compared with thickness increasement,the weight and thickness of the material can be reduced by filler content increasement.Several rare earth elements was compared with the traditional metal elements used for photon shielding.It is found that the shielding effect of Cd,Ba and La are similar and they can substitute each other in practical applications.Lu and Ta can also substitute each other.Besides,the complementary elements mixed into the polymer can improve the shielding performance.Neutron is set as the radiation source,rubber is material matrix and rare earth element compound is shielding filler.The results show that EPDM has better attenuation capacity than IIR,NBR,NR and SBR.Sm2O3 has better attenuation capacity than SmCl3 and La(NO3)3·6H2O.Sm2O3,Nd2O3,PE,TPU,Fe and A1 are set as fillers,respectively.When the neutron energy is less than 1 kev,the shielding performance of Sm2O3 is the best,PE is the best when neutron energy is between lkev and 3.5Mev,while Fe is the best when neutron energy is between 3.5Mev and 10Mev.By comparing the shielding properties of different structures,it is found that the layered shielding structure can effectively improve the neutron protection efficiency of the material and reduce the intensity of the secondary gamma rays produced.The effects of filler particle size on gamma ray and neutron shielding properties were studied.The results show that the smaller the particle size of the filler is,the better the photon shielding performance of the material is,and the neutron shielding performance does not change obviously.