Borated Polyethylene Sheet
Borated polyethylene sheet is a special type of plastic. It is made to stop a kind of energy called neutron radiation. This material combines the good points of two important parts: polyethylene and boron. Because of this, it is very useful in many areas where radiation protection is needed.
Key Features
- Strong neutron capture (boron-10).
- Common grades: 5% and 10% boron (others on request).
- Tough and impact-resistant like HDPE.
- Resists chemicals and moisture.
- Easier to cut, drill, and CNC than metal shields.
- Works well with lead or steel to reduce both neutrons and secondary gamma.
Applications
- Hospitals: To protect people from radiation in cancer treatment rooms and X-ray areas.
- Nuclear Power Plants: For shielding in reactor areas and places where nuclear materials are stored.
- Research Labs: To keep researchers safe from radiation during experiments.
- Security: It is also used at airports and seaports for security screening equipment.
What is Neutron Radiation?
Neutrons are tiny particles that make up the center of an atom. Neutron radiation is the energy released when these neutrons move very fast. You can find it in nuclear reactors, medical machines, and science labs. Neutron radiation can harm living things. So, we need good materials to block it.
How Does Borated Polyethylene Sheet Work?
Borated polyethylene sheet stops neutrons well because of its unique makeup. It does this job in two main steps:
1. Slowing Down Neutrons: Polyethylene is a plastic full of hydrogen atoms. Hydrogen atoms act like small springs. When fast neutrons hit these hydrogen atoms, the neutrons slow down. This process is called “neutron moderation.” Slower neutrons are easier to catch.
2. Absorbing Neutrons: Boron is a special element. It is mixed evenly into the polyethylene. Boron atoms have a very important quality: they can absorb slow neutrons very well. When boron atoms absorb a neutron, the neutron is taken out. This stops them from going through the material. It protects the area behind it.
The Importance of Boron Content
The amount of boron in borated polyethylene sheets can be different. Common boron levels are 2%, 5%, and 30% (by weight). The more boron there is, the better the material is at absorbing neutrons. The choice of boron content depends on what the material will be used for and how much protection is needed.