Abstract
This study aims to get the optimization neutron shielding design of iron/polyethylene combined shield structure. The neutron transmission coefficient with various energies for different thickness of iron and polyethylene combined shield structure were calculated by using Monte Carlo method. The simulation results show that the optimization effect of iron/polyethylene combined shield is not obvious when the neutron energy is low or the shield is thin, there is an optimal thickness ratio of iron to polyethylene adopted to get the best neutron shielding performance when the energy of neutron source is above 2 MeV and the total thickness of combined shielding structure is more than 20 cm. The optimal thickness ratio of iron to polyethylene increases with the increasing energy of neutron source; with the increasing of neutron source energy ranging from 4 MeV to 14 MeV, the optimal thickness ratio of iron to polyethylene trends from 0.11 to nearly 1.6.
Highlights
With the deepening research of nuclear technology and its application, the radiation protection is becoming more and more important
In the process of shielding design, it is necessary to pay attention to whether the shielding performance of material meets the requirements of radiation protection, and necessary to consider the factors such as the thickness, size and volume of shielding materials[3,4]
The results show that as the neutron energy gradually increases from 4 MeV to 14 MeV, the optimum thickness ratio gradually approaches at 1.6: 1. The experssion is obtained by fitting the optimum thickness ratio with the neutron energy
Summary
With the deepening research of nuclear technology and its application, the radiation protection is becoming more and more important. Luo Peng et al had carried out the simulation and comparison researches of T(D, n)4He neutron shielding performance of three kinds of shielding structure: iron- PE- boron carbide, copper- PE- boron carbide and tungsten- PE- boron carbide, wherein the metal and PE layer thickness values are selected for a single value[10]. The Monte Carlo method is used to simulate the neutron shielding performance of iron-polyethylene composite materials. The transmission coefficient of neutrons with different energy of iron and polyethylene composite materials with different thickness is calculated out to obtain the optimal size combination scheme, which can provides a basis reference for neutron shielding design
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