2.7
LEAD-HEADED NAILS
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NOTE: Lead-headed nails are seldom required; use if
radiological calculations show a need for them.
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Lead-headed nails may be used to accomplish shielding not less than that
provided by the barrier. The size, type and design shall be recommended by
the manufacturer of material to be installed.
2.8
LEAD TABS OR CLIPS
Lead tabs or clips shall be unpierced sheet lead not less than the
thickness of lead in the barrier. Prior to folding, the tabs shall be
rectangular in shape and shall be the required size to provide an effective
lead lap over an unleaded nail, screw, or tie wire penetration when folded.
2.9
LEAD-LINED WOOD DOORS
Lead-lined wood doors shall be [premium grade, book matched] [good grade],
hardwood veneer, solid core, in accordance with WDMA I.S. 1-A. Lead sheet
shall extend to door edges and provide x-ray absorption equal to the
partition in which the door is installed. Face veneer for lead-lined doors
shall be [birch] [mahogany] [red gum] [red oak] [white oak] [_____]
finished with [an approved natural finish] [_____]. Doors shall have
filler strips, crossbanding face veneers and hardwood edge strips glued
under heavy pressure with contact adhesive.
2.9.1
Shielding
Cores shall be secured together with [poured lead fasteners] [or] [steel
bolts], using washers under heads and nuts. Bolts shall be spaced not more
than 38 mm 1-1/2 inches from edges around door perimeter and not more than
200 mm 8 inches on centers in both directions. Bolts shall be countersunk
and have poured lead or lead dowels covering heads and nuts flush with face
of core. Door thickness shall be manufacturer's standard for lead
thickness used, unless shown otherwise.
2.9.2
Painting and Sealing Doors
Top and bottom edges of doors to be painted shall receive two factory coats
of spar varnish before shipment to jobsite. Doors to be stained or have a
natural finish shall receive two shop coats of water-resistant sealer
before shipment to jobsite.
2.9.3
Door Hardware
Door hardware shall be as specified in Section 08710 DOOR HARDWARE.
Mortises for floor hinge arms and top pivots with sheet lead and necessary
lead plugs, sheet lead, stainless steel pans, bolts and screws shall be
provided.
2.9.4
Thresholds
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NOTE: Threshold construction is determined by
radiographic equipment required, work load, and
location of radiation source from the door (i.e.,
SECTION 13090
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