Shieldwerx provides state-of-the-art neutron and gamma shielding products, custom design and fabrication of shielding materials, and neutron activation foils.
We supply the nuclear power and nuclear medicine industries, as well as accelerator research facilities worldwide.
Shieldwerx products are designed to combine the most effective shielding components into a single homogeneous composite.
These materials are available in a variety of forms including sheets, bricks, cylinders, pellets, casks, putties, castable dry-mix powders, as well as custom molded and machined shapes.
The base material provides a matrix for the additive. In addition to providing good mechanical properties, the base also contributes to the shielding effectiveness of the composite.
In order to minimize the production of induced radioactivity, we only use pure base materials and additives.
Shieldwerx offers a variety of base materials depending on the specific requirements of the situation.
Polyethylene is an exceptional base material for neutron shielding because of its outstanding nuclear, physical and chemical properties.
Of all practical materials, polyethylene contains more hydrogen atoms in a given volume than any other substance. It also has excellent machining and fabricating characteristics.
It is chemically inert, and can be obtained in a very pure form. Its physical properties permit uniform distribution of various useful additives throughout the material.
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How does composite shielding work?
Most radiation fields are combinations of different kinds of radiation. The radiations of most significance 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.
Samples and Advice
If you would like to examine the physical appearance and characteristics of shielding materials before specifying them, please contact us. We will send small samples to you free of charge. If you need assistance in selecting an appropriate shielding material please do not hesitate to contact one of our shielding engineers.
Custom pipe shield
SWX-238 Flexi-Boron in production