Views: 0 Author: Site Editor Publish Time: 2025-01-21 Origin: Site
Polyethylene radiation protection materials are used to protect against neutrons and gamma rays. Lead- and boron-containing polyethylene is formed by adding a certain amount of lead and boron to UHMWPE material and then pressing it under high temperature and high pressure, and then processed by CNC numerical control. It has excellent radiation resistance and low neutron and gamma ray energy penetration performance; it has high machining strength, smooth surface, easy to clean, and convenient for machining, installation and maintenance. The main products are: sheets, rods, shielding rooms, shielding boxes, etc. made of lead/boron/boron carbide polyethylene materials.
Characteristics of Boron-containing UHMWPE Radiation Protection Shielding Materials
(I) Shielding Principle
Neutron Radiation Shielding: The boron element in the boron-containing UHMWPE sheet can effectively absorb neutron radiation and convert it into heat or other forms of energy, thereby shielding neutron radiation. Polyethylene itself has a high hydrogen content and has a good ability to weaken fast neutrons. Boron absorbs thermal neutrons, and lead has a strong shielding effect on gamma radiation. Therefore, the lead-boron polyethylene sheet has a comprehensive shielding effect of shielding fast neutrons, thermal neutrons and gamma radiation.
(II) Performance advantages
Engineering performance: It has good engineering performance, good dimensional stability, satisfactory gamma radiation resistance, and an operating temperature of 80-120℃. Its thermal neutron, fast neutron and gamma radiation shielding performance is significantly better than polyethylene. The promotion and application of boron-containing polyethylene sheets will help simplify the shielding structure, reduce the weight of the shielding body, and reduce the volume of the shielding body.
Comparative advantages with other materials: Compared with traditional metals and concrete, boron-containing polyethylene materials have the characteristics of low density, good attenuation curve, convenient use, low cost, good processing performance, low corrosion to equipment, and will not cause environmental pollution. In addition, polyethylene resin has a high H element content and good radiation resistance. It can be effectively used for neutron radiation in neutron and gamma mixed radiation fields to meet the needs of radiation occasions of different energy levels.
Application fields
Laboratory field: Ultra-high molecular weight polyethylene sheet-radiation shielding material can be used for laboratory radiation protection walls.
Industrial field: It can replace carbon steel, stainless steel, bronze and other materials for textile, papermaking, food machinery, transportation, medical, coal mining, chemical industry and other departments. It has been widely used in power, port, coking, coal, paper, textile, chemical and other industries, and has achieved significant social and economic benefits. In nuclear power plants, it can be used as nuclear shielding materials for pan-fuel grids, nuclear-powered ships, nuclear reactor neutron radiation, etc. It can also be used in research fields such as China National Petroleum Corporation, the military, the Chinese Academy of Sciences, laboratories, hospitals and control rod materials for nuclear reactors.