Shieldwerx LogoShieldwerx SWX-215

7.5% Lithium Polyethylene Neutron Radiation Shielding




Shieldwerx SWX-215 7.5% Lithium Polyethylene Neutron Radiation Shielding●  7.5% Lithium Polyethylene Neutron Radiation Shielding

●  Uses Lithium, Which Does Not Produce a Capture Gamma

●  Contains High Hydrogen Content

●  Available in Slabs, Cylinders, Pellets and Custom Shapes


Shieldwerx SWX-215 is an effective neutron radiation shield that uses lithium instead of boron as the thermal neutron poison. Thermal neutrons captured by boron produce a 420 keV capture gamma that in some cases may be undesirable. Lithium does not produce a capture gamma, but since lithium has a lower thermal neutron cross section than does boron, your application will require a thicker shield to attain the same shielding factor as for a boron loaded polyethylene. SWX-215 is available in a wide range of form factors including slabs, bricks, cylinders, pellets, and other custom shapes. It is easily machined using common wood- and metal- working tools. Shieldwerx can not only provide custom machining, but can also pour SWX-215 into custom made molds to provide application specific radiation shielding forms.




Composition Data:

Hydrogen Atom Density/cm3: 5.44 x 1022
Natural Isotope Distribution: 99.98% 1H

Lithium Atom Density/cm3: 6.7 x 1021

Natural Isotope Distribution: 92.6% 7Li and 7.4% 6Li

Weight Percent of All Isotopes of Lithium: 7.5%
Total Density: 1.06 g/cm3 (66.2 lb/ft3)

Radiation Properties:

Macroscopic Thermal Neutron Cross Section: 0.48 (cm-1)                        
Gamma Resistance: 5 x 108 rad
Neutron Resistance: 2.5 x 1017 n/cm2

Physical Properties:

State: bricks, slabs, cylinders
Color: off-white, yellow
Odor: no odor
Machinability: excellent

Thermal Properties:

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

Chemical Properties:

Chemical Name & Synonyms: Lithium Polyethylene
Trade Name & Synonyms: SWX-215
Chemical Family: Polyolefin's
Formula: Mixture (CH2)n, B
Solubility in Water: negligible

Reactive Acids: incompatible with concentrate acids, releases C02

AVAILABLE SIZES: lithium polyethylene sheets

SWX-215U: 24 x 24 x 1 in. (610 x 610 x 25 mm) (W x L x Thickness)

SWX-215R: 48 x 48 x 1 in. (1219 x 1219 x 25 mm) (W x L x Thickness)

SWX-215C: 4 x 8 x 2 in. (102 x 203 x 51 mm) (W x L x Thickness)

SWX-215B: 24 x 24 x 2 in. (610 x 610 x 51 mm) (W x L x Thickness)

SWX-215X: 48 x 48 x 2 in. (1219 x 1219 x 51 mm) (W x L x Thickness)

SWX-215D: 24 x 24 x 4 in. (610 x 610 x 101 mm) (W x L x Thickness)

SWX-215E: 36 x 48 x 4 in. (914 x 1219 x 101 mm) (W x L x Thickness)

Custom sizes and thicknesses are available


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