Figure 12. Lead-lined control window frames.
e. Leaded plastic. Leaded plastic is a clear lead-containing plastic sheet that is installed to provide a lead
equivalent not less than that of the partitions or door of which it is a part. Leaded plastic sheets provide lead equivalents
from 0.3 to 2.0 millimeters thick in sheet thicknesses from 7 to 46 millimeters. Sheets are in sizes up to 72 by 96 inches.
Film (cassette) transfer cabinet (pass box). Film cabinets are manufactured from 18-gauge steel with a baked-
on finish. The cabinet walls are double wall with sheet lead between for shielding. Cabinets have two compartments with
four doors, two on each side equipped with pull knob and locking device arranged so that doors at both ends of the
compartment cannot be opened at the same time. When the cabinet is located in leadlined partitions, the entire cabinet,
doors, and integral wall flange must be lined with sheet lead of the same thickness as specified for the wall. Each
compartment has a corrugated rubber floor. See figure 13 for details.
g. Operator protective screens. Operator protective screens consist of opaque shielding panels with openings for
glass or plastic viewing panels or a modular system of opaqued shielding panels and separate viewing panels. The