borated polyethylene neutron shielding

Nuclear and medical radiation shielding applications require materials providing safety and protection for

environment and people, exhibiting high hydrogen density and low weight at acceptable cost.

Most radiation fields are combinations of different kinds of radiation, such as fast neutrons, thermal neutrons,

primary gamma and secondary gamma rays. So these all need our borated polyethylene neutron shielding

Fast neutrons are most effectively shielded by materials with high hydrogen content. They are slowed to

thermal energies by collision with hydrogen atoms. Thermal neutrons can be virtually eliminated by the

presence of high thermal neutron cross-section materials such as boron. Primary gamma rays are best

shielded with lead or other high density materials. Secondary gamma rays are created as the result of the

capture of thermal neutrons by hydrogen. These capture-gamma rays can be minimized by adding borated polyethylene neutron shielding.

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borated polyethylene neutron shielding Composition Data:

Hydrogen Atom Density/cm3: 7.5 x 1022

Natural Isotope Distribution: 99.98% 1H

Boron Atom Density/cm3: 3.0 x 1021

Natural Isotope Distribution: 19.6% 10B and 80.4% 11B

Weight Percent of All Isotopes of Boron:5.0%

Total Density: 1.08 g/cm3 (67 lb/ft3)

borated polyethylene neutron shielding Radiation Properties:

Macroscopic Thermal Neutron Cross Section: 2.00 (cm-1)                        

Gamma Resistance: 5 x 108 rad

Neutron Resistance: 2.5 x 1017 n/cm2

Physical Properties:

State: bricks, slabs, cylinders, pellets

Color: black

Odor: no odor

Machinability: excellent

Compressive Strength: 800 psi

borated polyethylene neutron shielding Thermal Properties:

Recommended Temperature Limit: 180 °F (82.2 °C)

Melting Point 210 °F (98.8 °C)

Boiling Point 300 °F (149 °C)                                                      

Thermal Conductivity 1

Cubical Coefficient of Expansion: 6.1 x 10-4

Linear Coefficient of Expansion: 2 x 104

Chemical Properties:

Chemical Name & Synonyms: Borated Polyethylene

Trade Name & Synonyms: SWX-201

Chemical Family: Polyolefin's

Formula: Mixture (CH2)n, B

Solubility in Water: negligible

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