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Boron-containing UHMWPE sheets are made from ultra-high molecular weight polyethylene(UHMWPE)materials, with boron added in the form of boron carbide (B₄C) or boron oxide (B₂O₃), uniformly dispersed in the matrix at a mass fraction of typically 5% to 30%. The boron-10 isotope has a high neutron absorption cross-section (approximately 3840 barns), which allows it to capture slow neutrons and produce low-hazard secondary radiation.
Borated UHMWPE sheet is a 5% boron loaded polyethylene neutron shield – HMW grade. Specifically developed for neutron shielding purposes in nuclear installations; its optimal boron content of 5% provides excellent attenuation of thermal neutrons, thus reducing the levels of capture-gamma radiation,1
