521.
Design or modification of diagnostic x-ray,
therapeutic x-ray, or gamma-beam therapy facilities
shall be undertaken only by experts certified in
radiological physics or therapeutic radio-logical
physics by the American Board of Radiology or the
American Board of Health Physics.
Where the increase in cost can be justified by
substantial increases in flexibility of the
facility, allow for future rearrangement of x-ray
equipment and facilities by providing the maximum
thickness of shielding which provides the minimum
protection in all areas that could be covered by the
primary beam. In any case, lead thickness shall be
uniform for the entire wall, ceiling, floor or
partition to which it is applied.
Department of the Army Technical manual 5-805-12,
"X-Ray Shielding," has standard details. It is
included in the CCB.
Include on the drawings:
1. Extent of the shielding; length, width, and
height of the lead sheeting.
2. Joint, opening, and corner details showing the
method of continuation of protection.
3. Door and window details, including louvers and
screens.
4. Pipe and conduit chases and penetration sleeves.
5. Location of all door and wall plaques.
6. Stud spacing for lead lined gypsum board or lath.
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1.1
REFERENCES
**************************************************************************
NOTE: Issue (date) of references included in
project specifications need not be more current than
provided by the latest guide specification. Use of
SpecsIntact automated reference checking is
recommended for projects based on older guide
specifications.
**************************************************************************
The publications listed below form a part of this specification to the
extent referenced. The publications are referred to within the text by the
basic designation only.
ASTM INTERNATIONAL (ASTM)
ASTM B 749
(2003) Lead and Lead Alloy Strip, Sheet,
SECTION 13090
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