How It Works
Shieldwerx products are designed to combine the most effective shielding components - a base & an additive - into a single homogeneous composite. The base material provides a matrix for the additive.
Most radiation fields are combinations of different kinds of radiation. The most significant are fast neutrons, thermal neutrons, primary gammas and secondary gammas. Shieldwerx composite shielding materials are designed to attenuate these types of radiation.
Fast Neutrons are most effectively shielded by hydrogen. Therefore, Shieldwerx composite shielding materials maximize the hydrogen content. Fast neutrons are slowed to thermal energies by collision with hydrogen atoms. Heavy metals such as lead, cadmium and iron also slow fast neutrons by inelastic scattering at the higher energies.
Thermal neutrons are virtually eliminated by the presence of high thermal neutron cross-section materials such as boron, lithium, or cadmium.
Primary Gamma Rays
Primary gamma rays are best shielded with lead or other high-density materials. With the continuing contamination and disposal issues related to lead, Shieldwerx offers many lead-free materials to replace lead in many of these applications.
Secondary Gamma Rays
Secondary gamma rays with energy of 2.2 MeV are created as the result of the capture of thermal neutrons by hydrogen. These capture-gamma rays can be minimized by adding boron or lithium. Gamma rays resulting from capture of neutrons by boron have energy of only 0.42 MeV, which reduces the overall dosage considerably.
Custom pipe shield
Shieldwerx offers a variety of base materials depending on the specific requirements of the situation. In addition to providing good mechanical properties, the base contributes to the shielding effectiveness of the composite.
Polyethylene is an exceptional base material for neutron shielding because of its outstanding nuclear, physical and chemical properties. Polyethylene contains more hydrogen atoms in a given volume than any other practical material. It also has excellent machining and fabricating characteristics. It is chemically inert, and can be obtained in a very pure form. The physical properties of poly permit uniform distribution of the additives throughout the material.
We have extensive experience with base materials such as polyethylene, epoxy, silicone, urethane, hydrocarbons, refractories, and cement materials. Additives include boron, lithium, iron, bismuth, and other inorganic and organic materials.