▎ 摘　　要

NOVELTY - Neutron and gamma ray shielding material comprises high-entropy alloy-graphene oxide nanocomposite materials, rare earth oxides, high molecular polymers and boron carbide prepared by a film-forming process. The mass ratio of high-entropy alloy-graphene oxide nanocomposite material, rare earth oxide, and polymer is 0.1-2:0.1-2:1. The high-entropy alloy-graphene oxide nanocomposite is prepared by (S1) adding graphene oxide in the organic solvent to disperse uniformly to obtain dispersion liquid, adding lead-free metal salt to the dispersion liquid, mixing evenly to obtain a reaction solution, and (S2) adding a reducing agent to the reaction solution to carry out a reduction reaction, cooling to room temperature after reaction finishes, filtering, washing and drying the filter cake. The lead-free metal salt is soluble metal salts of five metals in copper, tungsten, iron, nickel, bismuth, cobalt, molybdenum, manganese and zinc. The amount of each metal salt is an equimolar ratio. USE - The neutron and gamma ray shielding material is useful in neutron and gamma ray shielding field (claimed). Can also be used in medical care equipment and nuclear power plant. ADVANTAGE - The neutron and gamma ray shielding material is green and non-toxic, has stronger stability, can replace metal lead for absorption and shielding of neutrons and gamma rays. The obtained composite material has stronger neutron and γ-ray absorption and shielding effect, does not contain heavy metal lead, is not easily absorbed by the body, does not cause cancer, does not damage the DNA structure, and is more friendly to the human body. The method has simple film-forming process, environmentally friendly preparation process and lower production cost. DETAILED DESCRIPTION - Neutron and gamma ray shielding material comprises high-entropy alloy-graphene oxide nanocomposite materials, rare earth oxides, high molecular polymers and boron carbide prepared by a film-forming process. The mass ratio of the high-entropy alloy-graphene oxide nanocomposite material, rare earth oxide, and polymer is 0.1-2:0.1-2:1. The consumption of described boron carbide is the 20-45% of neutron and gamma ray shielding material quality. The high-entropy alloy-graphene oxide nanocomposite is prepared by (S1) adding graphene oxide in the organic solvent to disperse uniformly to obtain dispersion liquid, adding lead-free metal salt to the dispersion liquid, mixing evenly to obtain a reaction solution, and (S2) adding a reducing agent to the reaction solution to carry out a reduction reaction, where the temperature of the reduction reaction is 80-120°C, and the mass ratio of lead-free metal salt and reducing agent is 1:5-10, cooling to room temperature after reaction finishes, filtering, washing and drying the filter cake to obtain a high-entropy alloy-graphene oxide nanocomposite material. The mass fraction of graphene oxide in the high-entropy alloy-graphene oxide nanocomposite material is 2.1-24.5%. The lead-free metal salt is soluble metal salts of five metals in copper, tungsten, iron, nickel, bismuth, cobalt, molybdenum, manganese and zinc. The amount of each metal salt is an equimolar ratio. An INDEPENDENT CLAIM is also included for a method for preparing neutron and gamma ray shielding material comprising performing functionalization treatment on the high-entropy alloy-graphene oxide nanocomposite material, rare earth oxide and boron carbide according to the ratio to obtain a functionalized product, and processing the functionalized product and the high molecular polymer into a film by a film forming process to obtain a neutron and gamma ray shielding material.