Design Research of Plate Deep Penetration Shielding Benchmark Experiments Based on Cf-252 Neutron Source
As the basis of shielding design, the shielding calculation program and shielding database need to be verified, validated and improved by using the data from shielding benchmark experiments. Therefore, it's of great significance to carry out deep penetration shielding benchmark experiments and obtain reliable data from these benchmark experiments. Based on Cf-252 neutron source, a series of plate deep penetration shielding benchmark experiments are designed in this paper. The whole design is introduced from the aspects of the overall arrangement of the experiments, neutron source, deep penetration shielding samples, scattering deduction system. Monte Carlo calculation method is used to verify the effect of the scattering deduction device, and the effect of the collimation system is verified by uncertainty estimation. The verification results shows that the scattering deduction device designed in these experiments has a good scattering deduction effect, and the maximum deviation of the detector response rates after scattering deduction is about 5.51% compared with that without scattering. When the thickness of the iron plate sample is less than 65 cm, the estimated uncertainty of the count rate of the direct penetration neutrons is less than 10%.
