From http://dspace.dial.pipex.com/johncaunt/shielding/pages/neutshield.html:
MODEL JC291 - BORAL
Description:
Boral is a uniform dispersion of a boron carbide
in aluminium. The resulting sandwich has an exceptionally high cross-section for
thermal neutrons and will withstand temperatures up to 540ēC.
Chemical & Physical Properties:
Boron atoms/cc: 23.8 x
1021
Temperature Limit: 540ēC
Density: 2.5g/cc
Options:
Available cut to size.
Fabricated to customer
shape.
Uses:
Isolators in spent fuel element racks.
Inner
sections of reactor shields.
Neutron curtains.
Shipping
containers.
Rick Orthen
Earth Sciences Consultants, Inc.
Export, PA