ࡱ> o bjbj^^ G by field measurements before fabrication. PRODUCTS SYSTEM PERFORMANCE REQUIREMENTS Materials, thicknesses, and configurations indicated are based on radiation protection design prepared by Owner's radiation health physicist. Provide radiation protection consistent with materials specified in thicknesses and locations indicated. Radiation protection design prepared by Owner's radiation health physicist is available to Contractor on request. Make joints, fasten to substrates, and shield penetrations to maintain indicated lead equivalence at all points and in all directions. Lead-Lined Assemblies: Unless otherwise indicated, the thickness of lead used in doors, door frames, window frames, penetration shielding, joint strips, film transfer cabinets, and other items located in lead-lined assemblies shall not be less than that indicated for assemblies in which they are installed. Lead Glass: Unless otherwise indicated, provide lead equivalence not less than that indicated for assembly in which glass is installed. Lead Glazing Plastic: Unless otherwise indicated, provide lead equivalence not less than that indicated for assembly in which glazing plastic is installed. GENERAL Materials shall meet or exceed all applicable referenced standards, federal, state and local requirements, and conform to codes and ordinances of authorities having jurisdiction. MANUFACTURERS Source Limitations: Obtain each type of radiation protection product from single source from single manufacturer [unless otherwise indicated]. Manufacturers: Subject to compliance with requirements, provide products by one of the following: Lead-Lined Steel Doors and Frames: [Steel door and frame manufacturers listed below offer lead-lined doors and frames.] American Steel Products Corp. Deronde Products. El Dorado Metals, Inc. Karpen Steel Custom Doors & Frames. Kewanee Corp. Pioneer Industries. Precision Metals, Inc. Security Metal Products, Inc. Shielding Construction Solutions, Inc. Tex-Steel Corporation. Lead-Lined Wood Doors: [Wood door manufacturers listed below offer lead-lined doors.] Algoma Hardwoods, Inc. Eggers Industries; Architectural Door Div. General Veneer Manufacturing Co. Haley Brothers, Inc. Ideal Wood Products, Inc. Oshkosh Architectural Door Co. VT Industries, Inc. Weyerhaeuser Co. Lead Glass: Deutsche Spezialglas AG; Distributed by Schott Corp., Technical Glass Div. Lead Glazing Plastic: Victoreen, Inc.; Nuclear Associates Div. Modular Shielding Partitions: Victoreen, Inc.; Nuclear Associates Div. MATERIALS [Select required materials below. Add other materials or revise paragraphs retained to suit Project.] Lead Sheet: FSQQ-L-201, GradeC, or ASTMB749, alloy UNS No.L51120 (chemical lead). Lead Bricks: Interlocking cast- or extruded-lead bricks made from pig lead, complying with ASTMB29 with 1/2 percent antimony added, with tongues on one edge and end and grooves on one edge and end. [Paragraphs above and below are often used for shielding linear accelerator therapy rooms, especially on retrofit projects. Retain below if neutron shielding doors are required.] Borated Polyethylene: Manufactured specifically for neutron shielding and containing not less than 5 percent boron. Lead Glass: Lead-barium, polished plate glass containing more than 60 percent heavy metal oxide, including 55 percent lead oxide by weight. Lead Glazing Plastic: Transparent acrylic sheet impregnated with an organolead compound and containing 30 percent lead by weight. Lead-Lined Concrete Masonry Units: Fabricated from 2 solid concrete units, complying with ASTMC90 or ASTMC129, separated vertically by a single lead sheet permanently bonded or anchored between the 2 halves. Size lead sheets to provide a 1-inch (25-mm) overlap with adjacent units or provide supplemental lead to ensure uninterrupted protection. Provide special shapes as needed to maintain bond without cutting units. Masonry Mortar: Comply with Division04 Section "Unit Masonry." [Retain paragraph above if other masonry is used on Project; otherwise, select paragraph below.] Masonry Mortar: Comply with ASTMC270, TypeN, Proportion Specification. [Delete subparagraph below if masonry cement mortar is acceptable.] Limit cementitious materials to portland cement and hydrated lime. [Select 1 of 3 paragraphs below if lead-lined panels are required. Select first or second PARAGRAPH AND specify face veneer and other characteristics not related to shielding in Division06 Section if unlined panels are also required; otherwise, select third paragraph.] Lead-Lined Plywood Panels: Panels complying with Division6 with a single lead sheet laminated to the back of the panel. Accessories for Lead-Lined Plywood Panels: [Retain subp]aragraph below for narrow joint covers or no joint covers if required.] Provide 2-inch- (50-mm-) wide lead strips for backing joints. [Subparagraph below will wrap both sides and back of wood furring to provide continuity of shielding at joints and fasteners.] Provide 4-inch- (100-mm-) wide lead strips behind wood furring. Lead-Lined Gypsum Lath: Gypsum lath complying with Division09 Section "Gypsum Plaster" with a single lead sheet, 1 inch (25 mm) longer and wider than lath, laminated to the back of the lath so lead extends 1 inch (25 mm) beyond one side and one end. Gypsum Lath Thickness: 1/2 inch (12.7 mm). Sheet Size: 16 by 48 inches (406 by 1220 mm). Provide 5/8-inch (16-mm) lead disks or lead tabs 5/8 by 1-1/4 inches (16 by 32 mm) for covering screw heads. Provide accessories and trim complying with Division09. Lead-Lined Gypsum Base for Gypsum Veneer Plaster: Gypsum board complying with Division09, of width and length required for support spacing and to prevent cracking during handling, with a single lead sheet laminated to the back of the board. [Select paragraph above for gypsum veneer plaster or paragraph below for gypsum board. Either paragraph and related installation requirements may be moved to appropriate Division9 Section, if desired.] Lead-Lined Gypsum Board: Gypsum board complying with Division09, of width and length required for support spacing and to prevent cracking during handling, with a single lead sheet laminated to the back of the board. Gypsum Board Thickness: 5/8 inch (15.9 mm). Provide 3-inch- (75-mm-) wide lead strips for wrapping metal stud flanges. Provide 5/16-inch (8-mm) lead disks for covering screw heads. Provide finishing materials, accessories, and trim complying with Division 09. [Select subparagraph below for gypsum veneer plaster.] Provide plaster, other finishing materials, accessories, and trim complying with Division09 Sections. Accessories and Fasteners: Provide manufacturer's standard fasteners and accessories as required for installation, maintaining same lead equivalence as rest of system. MANUFACTURED UNITS Lead-Lined Steel Doors: Steel doors complying with NAAMMHMMA861, except that a single continuous lead sheet, of thickness indicated and extending from top to bottom and edge to edge, shall be installed either between back-to-back stiffeners or between stiffeners and stop face of door. Size doors for 1/16-inch (1.5-mm) clearance from frames at heads and jambs and for minimum clearance at bottom. Line inverted channels at top and bottom of doors with lead sheet of same thickness used in door and close with filler channels to provide flush top and bottom edges. Shield cutouts for locksets with lead sheet of same thickness used in door. Lap lining of cutouts with door lining 1 inch (25 mm). [Delete subparagraph below if no view windows or louvers in steel doors.] Prepare doors to receive view windows and louvers as indicated. Provide removable stops for glazed openings. Provide lead-lined astragals for pairs of doors. Lead-Lined Steel Door Frames: Steel door frames complying with NAAMMHMMA861 and lined with lead sheet of thickness not less than that required for doors and walls where frames are used. [Select paragraph above or below. Below is extra heavy-duty and often used with heavy, lead-lined doors.] Lead-Lined Steel Door Frames: Steel door frames complying with NAAMMHMMA861, except 0.0667 inch (1.7 mm) thick, and lined with lead sheet of thickness not less than that required for doors and walls where frames are used. [Retain subparagraphs below with either paragraph above.] Provide additional reinforcements and internal supports to adequately carry the weight of lead-lined doors. Install reinforcements and supports before installing lead lining. Form lead sheet to match frame contour, continuous in each jamb and across the head, lapping the stops. Form lead shields around areas prepared to receive hardware. Fabricate lead lining wide enough to maintain an effective lap with lead of adjacent shielding. Lead-Lined Wood Doors: Flush wood doors complying with Division 08 sections and NWWDAI.S.1-A with lead lining indicated. Lead Lining: One or more continuous lead sheets extending from top to bottom and edge to edge, constructed either in the core or between the core and faces, at manufacturer's option. [Select subparagraph above or below. Some manufacturers do not offer construction with fasteners described below; some only provide it for heavier lead thicknesses.] Lead Lining: One continuous lead sheet extending from top to bottom and edge to edge, constructed in the core. Assemble lead lining and core with poured lead fasteners or steel bolts. Space fasteners not more than 1-1/2 inches (38 mm) from door edge and about 8 inches (200 mm) on center. Countersink bolt heads and cover with poured lead. Shield cutouts for locksets with lead sheet of same thickness used in door. Lap lining of cutouts with door lining. [Delete subparagraph below if no view windows or louvers in wood doors.] Prepare doors to receive view windows and louvers as indicated. Provide removable wood stops for glazed openings. Provide lead-lined astragals for pairs of doors. [Paragraph below describes a typical door for a linear accelerator therapy room. Revise shielding requirements as required by radiation health physicist's design.] Neutron Shielding Doors and Frames: Steel plate doors lined with lead sheet and borated polyethylene and hung from structural-steel door frames. Shielding Requirements: 3/4-inch- (19-mm-) thick lead sheet on therapy room side, 4 inches (100 mm) of borated polyethylene on other side in door, and 1/4-inch- (6.35-mm-) thick lead sheet in sill. Steel Plates, Shapes, and Bars: ASTMA36 (ASTMA36M). Door Construction: Fabricate from 1/4-inch- (6-mm-) thick steel plate faces, reinforced at hinge locations, and 1/2-inch- (13-mm-) thick, steel flat-bar edges fully welded together. Continuously weld exposed joints and finish smooth, matching adjacent surfaces. Use wood filler to provide smooth, even surfaces on interior of door faces for applying lead sheet and polyethylene. Bond lead sheet to interior of door face with permanent adhesive. Install lead sheet in one piece and polyethylene in single or multiple sheets, all full height and width of door interior. Door Frame Construction: Fabricate from 1/4-inch- (6-mm-) thick steel plate to dimensions indicated, fully welded together. Continuously weld exposed joints and finish smooth, matching adjacent surfaces. [Delete subparagraph below if door frames are detailed on Drawings.] Fabricate frames with depth equal to thickness of shielding wall in which door is installed. Rabbet frame to receive door and to provide a 4-inch (100-mm) overlap between door edges and remaining frame depth. Make frame faces 4 inches (100 mm) wide with 3/4-inch- (19-mm-) deep backbends. [Retain subparagraph below if subparagraph above is deleted.] Reinforce frames and drill and tap as needed to accept finish hardware. Provide steel strap anchors using 1/8-by-2-inch (3-by-50-mm) straps of length required for a minimum 8-inch (200-mm) embedment. Weld anchors to frame members not more than 8 inches (200 mm) from both bottom and top of jambs and from ends of head and space anchors not more than 24 inches (600 mm) apart. Provide channel-shaped sill fabricated from 1/4-inch- (6-mm-) thick steel plate lined with lead sheet. Make sill same width as jambs by 1-1/2 inches (38 mm) deep and weld to door jambs. Shop-Primed Finish: Prepare ferrous-metal surfaces to comply with SSPC-SP3 (Power Tool Cleaning) and apply a fast-curing, lead- and chromate-free, universal modified-alkyd primer complying with performance requirements of FSTT-P-664. [Subparagraph below increases coverage at hard-to-reach and vulnerable areas.] Stripe paint corners, crevices, bolts, welds, and sharp edges. Hardware: Provide the following hardware for each door: Hinges: BHMAA156.1, TypeA8391; weld- or bolt-on type at manufacturer's option; sized for door weight; 2 or 3 per door at manufacturer's option. Pulls: BHMAA156.6, TypeJ401, 2 per door. Operator: Power-opening and spring- or power-closing unit; with automatic hold-open; complying with BHMAA156.10; sized for door weight and width; and adjustable for opening, closing, and checking speeds. Unit shall have an emergency release to allow door to be opened manually and a disconnect switch to prevent power operation when door is in emergency-release mode. Controls: Provide 2 wall-mounted, recessed, push-plate switches for opening door and 1 push-button switch for closing door. Provide motion or presence sensors to detect persons or objects in path of door and to stop and reverse action of door operator in such a case. Door Interlock Switch: Provide electric switch in frame jamb to prevent operation of radiation therapy equipment when door is open and to shut off power to equipment if door is opened while equipment is in use. Provide rough box for installing switch, fabricated from 1/4-inch- (6-mm-) thick steel plate welded to frame and lined on all sides with 1/4-inch- (6-mm-) thick lead sheet. View-Window Frames: Fabricate from 0.0428-inch- (1.1-mm-) thick, formed-steel sheet or 0.064-inch- (1.6-mm-) thick aluminum extrusions with mitered corners, welded or bolted with concealed fasteners. Line with lead sheet formed to match frame contour, continuous in each jamb and across head and sill, lapping the stops, and fabricated wide enough to maintain an effective lap with lead of adjoining assemblies. Construct so lead lining overlaps glazing material perimeter by at least 3/8 inch (9 mm) and provide removable stops. Form sill with an opening for sound transmission. Offset sound passage to make opening lightproof and to maintain required lead equivalence at all points and in all directions. [Lead louvers are for doors, not HVAC grilles.] Lead Door Louvers: Provide louvers with about 30 percent minimum free area, of sizes and types indicated. Fabricate from formed-lead sheet or lead extrusions of not less than lead thickness required for door in which louver is installed. Fabricate louvers to be lightproof with fixed maze-type blades that maintain required lead equivalence at all points and in all directions. Factory fit and assemble louvers in doors before shipping to Project Site. [Paragraph below describes Victoreen product distributed by other listed manufacturers. Delete if not required.] Modular Shielding Partitions: Partial-height modular partitions assembled from factory-finished standard components consisting of lead-lined enameled steel framing members, lead-lined opaque panels, lead glazing plastic vision panels, and hardware necessary for assembly and for securing to other construction. Fabricate opaque panels from honeycomb-core metal panels with polyurethane paint finish. Lead Equivalence for Opaque Panels: 1.5 mm. Lead Equivalence for Framing Members: 1.5 mm. [Select 1 of 4 subparagraphs below. Vision panels with lead equivalence of 1.5 mm cost about 25 percent more than those with 0.5 mm and provide about 10 times the radiation protection.] Lead Equivalence for Vision Panels: 1.5 mm. Lead Equivalence for Vision Panels: 1.0 mm. Lead Equivalence for Vision Panels: 0.8 mm. Lead Equivalence for Vision Panels: 0.5 mm. [Delete paragraph below if film transfer cabinets are not in Project.] Film Transfer Cabinets: Factory-fabricated, double-wall construction, of 0.0428-inch- (1.1-mm-) thick, cold-rolled, stretcher-leveled, commercial-quality steel sheet free of scale, buckle, pits, and other defects. [Select 1 of 3 subparagraphs below or modify. First is standard cassette size. Second is magazine changer size.] Configuration and Size: 2-compartment, 4-door type with compartments 8 inches wide by 19 inches high by 18-3/4 inches deep (203 mm wide by 483 mm high by 476 mm deep) inside. Configuration and Size: 2-compartment, 4-door type with compartments 10-1/4 inches wide by 21 inches high by 20 inches deep (260 mm wide by 533 mm high by 508 mm deep) inside. Configuration and Size: As indicated on Drawings. Line entire interior and doors with lead sheet not less than that required for partition in which cabinet is installed. Provide an integral flange with lead lining extending beyond rough opening at least 3/4 inch (19 mm). Provide a sound passage in cabinet frame. Offset sound passage to make opening lightproof and to maintain required lead equivalence at all points and in all directions. Doors: Mount doors on full-height, concealed-leaf hinges. Label doors to one compartment "EXPOSED" and to other "UNEXPOSED." Provide a manual interlocking device to prevent doors on opposite sides of compartments from being opened at the same time. Exterior Finish: Baked-on gray enamel primer. Cabinet Interior: Provide each compartment with a black rubber floor. Finish interior of doors, sides, and top in a nonreflective black finish. Trim: Provide face flange or separate trim on each side of wall. Hardware: Provide bright, polished, chrome-plated brass hardware. [Delete subparagraph below if units are not provided with a rough-in frame or revise to suit Project.] Rough-in Frame: Provide adjustable telescoping rough-in frame fabricated from 0.064-inch- (1.6-mm-) thick, zinc-coated steel. Design frame to allow adjustment for wall thicknesses from about 4 to 8 inches (100 to 200 mm). Support Brackets: Provide 2 support brackets for each cabinet. Brackets shall be manufactured from 1-inch (25-mm) OD, 0.065-inch (1.65-mm) wall thickness, anodized aluminum or stainless-steel tubing with satin finish. Provide with fixed- or swivel-type mounting flanges on both ends. [Select subparagraph above or below. Delete both if units do not need support brackets.] Support Brackets: Provide 2 triangular support brackets for each cabinet. Brackets shall be manufactured from 0.0428-inch- (1.1-mm-) thick steel sheet with flanges for fastening to wall and to cabinet. Finish with baked-on primer. INFORMATIONAL SIGNS Informational Signs, General: Fabricate signs by engraving lettering in high-pressure-laminate engraving stock with contrasting face and core. Machine engrave copy using high-speed cutters mechanically positioned by master templates for accurately formed letters, numbers, and symbols. Color: As selected by Architect from manufacturer's full range of colors. Provide copy indicated or as directed. Provide signs of sufficient size to contain required information. [Retain subparagraphs above and below with either paragraph above.] Indicate lead equivalence in millimeters and heights of radiation protection in inches. [Retain appropriate paragraphs below to suit Project. Revise or modify each paragraph as required by radiation health physicist or authorities having jurisdiction.] Rooms Where the Level of Protection Is Uniform Throughout: Provide one sign for each room indicating lead equivalence of partitions, ceilings, floors, doors, and other portions of radiation protection enclosure. Indicate height of radiation protection above floor or indicate that partitions are radiation protected to full height. Rooms Where the Level of Protection Is Not Uniform Throughout: Provide one sign for each room with different lead equivalences in different locations. Indicate, in tabular form, lead equivalence of each wall, partition, floor, ceiling, door, and window. Indicate height of radiation protection above floor or indicate that partitions are radiation protected to full height. Indicate where lead equivalence changes or is not continuous. Rooms with Partitions without Radiation Protection: Provide one sign for each partition that contains radiation protection and indicate its lead equivalence. Indicate height of radiation protection above floor or indicate that partitions are radiation protected to full height. Rooms Where Only the Door Has Radiation Protection: Provide one sign for each door indicating its lead equivalence. EXECUTION EXAMINATION Examine substrates in areas to receive radiation protection, with Installer present, for compliance with requirements, installation tolerances, and other conditions affecting performance of radiation protection. Do not proceed with installation until unsatisfactory conditions have been corrected. [Delete below if lead sheet is not installed on concrete floors.] Concrete Surfaces: Do not proceed until surfaces are clean, dry, and free of depressions and sharp projections that could damage or penetrate lead sheet. INSTALLATION Installation shall meet or exceed all applicable federal, state and local requirements, referenced standards and conform to codes and ordinances of authorities having jurisdiction. All installation shall be in accordance with manufacturers published recommendations. INSTALLATION OF LEAD SHEETS IN CONCRETE FLOOR SLABS [Delete this Article if Project does not require installing lead sheets in concrete floor slabs.] Apply a coat of asphalt mastic or paint to concrete surfaces before installing lead sheet. [Delete paragraph below if lead-lined concrete masonry construction is not required.] Before installing floor linings, place lead strips not less than 7 inches (175 mm) wide under the base of vertical wall protection. Extend lead strips approximately 3 inches (75 mm) into the shielded room area. Lead Sheet, 1/8 Inch (3 mm) Thick or Less: Install in a single layer with a 2-inch (50-mm) minimum lap at joints. [Delete paragraph below if no lead sheet more than 1/8 inch (3 mm) thick.] Lead Sheet More Than 1/8 Inch (3 mm) Thick: Install in 2 or more layers with a 2-inch (50-mm) minimum lap at joints, or in a single layer with joints butted and covered with a 4-inch- (100-mm-) wide lead strip of the same thickness. [Delete either paragraph below if not applicable.] Extend lead sheet at least 12 inches (300 mm) beyond radiation protection in walls of room. In floor slabs above shielded rooms, where lead sheet is indicated, extend lead sheet at least 12 inches (300 mm) beyond radiation protection in walls of room below. [Delete paragraph below if not required. This provision can be used at doors, even if floor is not lined, to decrease radiation scattered under door. Recess slab to receive lining.] At door openings, extend lead sheet at least 12 inches (300 mm) beyond radiation protection in walls and at least 12 inches (300 mm) beyond door opening on both sides. After installation, apply a coat of asphalt mastic or paint on top surface of lead sheet. [Paragraph above protects lead from chemical action of wet concrete; subparagraph below protects from mechanical damage. Replace below with asphalt felt, if desired.] Cover lead sheet with reinforced-asphalt protection board. INSTALLATION OF LEAD-LINED CONCRETE MASONRY UNITS [Delete this Article if lead-lined concrete masonry units are not required.] Lay units in courses with staggered vertical joints, using methods recommended in writing by concrete masonry unit manufacturer. Field-cut units in a manner that will not reduce the lead's bond, lapping margin, or shielding qualities. Blocks Designed to Have Lead Laps at Joints: Erect units with tight lead laps without soldering or burning. Blocks Designed to Have Lead Bars in Joints: Lay units with lead bars, of thickness not less than that required in block, in each horizontal and vertical joint. Position bars directly adjacent to lead lining of blocks with bars overlapping lead lining at least twice the thickness of lead lining, but not less than 1/2 inch (13 mm). Mortar Joints: Place units with 1/2-inch (13-mm) solidly filled mortar joints. Mortar between lead laps is not permitted. Cut joints flush with face of units. Wraparound Metal Frames: Extend units into frame openings with lead lining projecting into rabbets of frames to effectively lap with lead frames or frame linings at least 1 inch (25 mm). Pipe and Conduit Chases: Where pipe and conduit chases occur within blocks, faces can be removed from one side to permit installation. Where necessary to remove lead lining for pipe and conduit installation, install continuous lead sheet and overlap adjoining lead protection at least 1 inch (25 mm). Fill voids around pipe and conduit chases with mortar, finished flush with face of partition. Do not locate pipe and conduit chases directly opposite each other in the same partition. INSTALLATION OF LEAD-LINED PLYWOOD PANELS [Delete this Article if lead-lined plywood panels are not required.] [Select 1 of 2 paragraphs below and subparagraphs following them depending on installation method desired.] Install panels over wood furring or supports as follows: Install wood furring over lead strips that cover back and sides of furring. Fasten to concrete and masonry with countersunk screws driven into lead plugs. Fasten to wood members with lead-headed nails. Locate nails to avoid panel joints. Butt panel joints tightly with joints occurring over furring. Apply panels using panel adhesive and finishing nails. Size finishing nails to avoid penetrating lead strips behind furring and offset from fasteners used to apply furring strips by at least 3 inches (75 mm). Set nails 1/16 inch (1.5 mm) below panel face and finish with filler to match panel finish. Install panels over wood furring or supports as follows: Butt panel joints tightly with joints occurring over supports. [Retain subparagraph below if joint covers are less than 2 inches (50 mm) wide.] Before nailing panels, nail 1-1/2-inch- (38-mm-) wide lead strips to supports at panel joints with nails placed along outer edges of strips. Provide shims at intermediate supports. Nail sides and ends of panels at about 8 inches (200 mm) on center. At intermediate points, nail panels in uniform pattern with lead-headed nails at about 16 inches (400 mm) on center. Nail joint covers at 8 inches (200 mm) on center using lead-headed nails on centerline of cover. Set nails 1/16 inch (1.5 mm) below panel face or joint strip and finish with filler or plugs to match panel finish. Lead-Headed Nails: Drill pilot holes for nails to prevent deforming nails or distorting panels. Lap lead lining at corners and around frames at least 1 inch (25 mm). Use lead extensions on panels or lead sheet strips not less than thickness of lead in panel. INSTALLATION OF LEAD-LINED GYPSUM LATH [Delete this Article if lead-lined gypsum lath is not required.] [Revise paragraph below if another installation method is required.] Install lath with long edges at right angles to supports with lead lining facing supports. Place end joints over supports and stagger joints in alternate courses. Overlap lead extensions on adjacent lath to provide an effective lead lap. [Delete subparagraph below if ceiling lath is not required.] Do not permit joints in walls to align with adjacent ceiling joints. Fastening to Metal Supports: Use screws spaced as recommended in writing by gypsum lath manufacturer. Drive screws through lead tabs and fold tabs over screw heads or apply lead disks over screw heads. Openings: Extend lead-lined gypsum lath into frames of openings, lapping lead lining with lead frames or frame linings at least 1 inch (25 mm). Arrange lath around openings so neither horizontal nor vertical joints occur at corners of openings. Accessories and Trim: Comply with Division09 Section "Gypsum Plaster" for installing trim and accessories. Fasten to metal supports with screws, using lead tabs or lead disks as specified above for fastening lath. [Delete below if no control or expansion joints occur in lead-lined construction.] Install control and expansion joints where indicated, with appropriate trim accessories. Install lead strip on face of framing, extending across joint, and lap with lead lining of lath. INSTALLATION OF LEAD-LINED GYPSUM BASE FOR GYPSUM VENEER PLASTER [Select Article title above for gypsum veneer plaster or below for gypsum board.] INSTALLATION OF LEAD-LINED GYPSUM BOARD Install with long edge parallel to supports and lead lining facing supports. Provide blocking at end joints. Fastening to Metal Supports: Use steel drill screws spaced as recommended in writing by gypsum board manufacturer. Install lead strips covering face of framing and wrap around flange to cover points of screws. [Below requires applying lead-lined gypsum board before finish on other side of partitions, but provides better protection for lead strips.] Where possible, do not fold lead strips back over inside of flange until after lead-lined gypsum board is applied. [Select paragraph and subparagraph above or below if metal framing is used.] Fastening to Metal Supports: Use steel drill screws spaced as recommended in writing by gypsum board manufacturer. Apply lead disks over screw heads and recess flush with surface of board. Install lead strips, 1-1/2-inch- (38-mm-) wide minimum and same thickness as lead lining, to face of supports and blocking where joints occur. Secure lead strips with construction adhesive. Provide shims at intermediate supports. Openings: Extend lead-lined gypsum board into frames of openings, lapping lead lining with lead frames or frame linings at least 1 inch (25 mm). Arrange board around openings so neither horizontal nor vertical joints occur at corners of openings. [A second layer over base sheets will hide most fasteners and other unevenness. Delete paragraph below if a 2-layer system is not required.] Two-Layer Systems: Apply a facing sheet of gypsum board vertically over base sheet using bonding adhesive recommended in writing by gypsum board manufacturer. Offset joints in finish layer from joints in base layer and fasten at top and bottom of sheet to support finish panel until adhesive has set. Locate fasteners above ceiling or behind wall base and cover fasteners with lead disks recessed flush with surface of board. Finishing: Comply with Division09 Section for installing plaster trim and accessories, and for joint treatment, application of gypsum veneer plaster, and preparation for finishing. [Select paragraph above for gypsum veneer plaster or paragraph below for gypsum board.] Finishing: Comply with Division09 Section for installing gypsum drywall trim and accessories, and for joint treatment and finishing. Apply lead disks recessed flush with surface of board over screw heads securing trim. [Delete below if no control or expansion joints occur in lead-lined construction. Detail joints if any are required.] Install control and expansion joints where indicated, with appropriate trim accessories. Install lead strip on face of framing, extending across joint, and lap with lead lining of gypsum board. INSTALLATION OF DOORS AND FRAMES Install lead-lined steel doors and frames according to Division08 Sections unless otherwise indicated. Install lead-lined wood doors according to Division 08 Sections unless otherwise indicated. Lap lead lining of frames over lining in walls at least 1 inch (25 mm). [Select paragraph above or below. Select above if frames have been specified as factory lined in this Section. Select below if frames without lining are specified in another Section.] Lead Lining of Frames: Line inside of frames with lead sheet of thickness not less than that required in doors and walls where frames are used. Form lead sheet to match frame contour, continuous in each jamb and across the head, lapping the stops. Form lead shields around areas prepared to receive hardware. Lap lining over lining in walls at least 1 inch (25 mm). [Delete paragraph below if no astragals.] Line astragals with lead sheet. Hardware: Line covers, escutcheons, and plates to provide effective shielding at cutouts and penetrations of frames and doors. See Division08 Section "Door Hardware" for other installation requirements. [Delete paragraphs below if Division08 Sections are referenced for installation in paragraphs above.] Touch up damaged finishes with compatible coating after sanding smooth. Check and readjust operating hardware items, leaving doors and frames undamaged and in proper operating condition. INSTALLATION OF NEUTRON SHIELDING DOORS AND FRAMES Install frames in concrete forms before concrete is placed. Adjust frames as needed so they are square and within 1/16 inch (1.5 mm) of plumb. Secure frames to forms and brace to resist forces resulting from concrete placement. Install doors in frames and install door operators, door controls, interlock switches, and other components according to manufacturer's written instructions and Shop Drawings. Touch up damaged primer with compatible coating after sanding smooth. Check and readjust operators and controls for opening, closing, latching, and back-checking speeds and for open and closed door position. INSTALLATION OF MODULAR SHIELDING PARTITIONS Install partitions after finishes are complete in spaces where partitions are located. Install according to manufacturer's written instructions and Shop Drawings. Cut and remove wall base where modular shielding partitions meet other walls so partition will fit tightly to wall. Secure partition framing to floor with 1/4-inch (6-mm) expansion anchors 16 inches (400 mm) on center and fasten to walls and ceilings as indicated. Brace partitions with tie rods fastened to walls or ceilings as indicated. INSTALLATION OF PENETRATING ITEMS At penetrations of lead linings, provide lead shields to maintain continuity of protection. Provide lead linings, sleeves, shields, and other protection in thickness not less than that required in assembly being penetrated. Secure shields at penetrations using adhesive or wire ties, but not penetrating fasteners, unless indicated on Drawings. [Delete paragraph below if no film transfer cabinets or revise to suit Project.] Film Transfer Cabinets: Where film transfer cabinets occur in lead-lined partitions, line wall flange with lead sheet of same thickness as required for partition where it is located. Outlet Boxes and Conduit: Cover or line with lead sheet lapped over adjacent lead lining at least 1 inch (25 mm). Wrap conduit with lead sheet for 10 inches (250 mm) from box. [Delete paragraph below if no shielded duct openings. A distance of 3 times the duct opening dimension is NCRP's recommendation for openings in secondary barriers. Verify with radiation health physicist.] Duct Openings: Unless otherwise indicated, line or wrap ducts with lead sheet for distance from partition/ceiling equal to 3 times the largest opening dimension. Lap lead sheet with adjacent lead lining at least 1 inch (25 mm). [Below is adequate for pipes 2-inch NPS (DN50) or smaller. If pipes 3-inch NPS (DN80) or larger penetrate radiation protection, detail them on Drawings.] Piping: Unless otherwise indicated, wrap piping with lead sheet for 10 inches (250 mm) from point of penetration. FIELD QUALITY CONTROL [Retain 3 paragraphs below if field inspection is used to ensure compliance with shielding details.] Field Inspection: Owner will engage a qualified independent testing agency to perform field inspections and to prepare reports. Correct deficiencies in or remove and replace radiation protection that inspection reports indicate does not comply with specified requirements. Additional inspections, at Contractor's expense, will be performed to determine compliance of corrected Work with specified requirements. [Retain paragraphs below, for testing after installation, with or without inspection requirements above.] Testing: After radiology equipment has been installed and placed in operating condition, Owner will engage a radiation health physicist to test radiation protection. Make corrections required by radiation health physicist. Uncover and repair or replace defective Work, including finishes and other Work covering defective Work. Arrange and pay for additional testing by radiation health physicist until no more corrections are required. PROTECTION Lock radiation-protected rooms once doors and locks are installed and limit access to those persons performing Work in the rooms. iNCLUDE ATTACHMENT OF PHYSICISTS REPORT IF APPLICABLE. RETAIN ATTACHMENT NOTATION BELOW EVEN IF NOT AVAILABLE AT TIME OF PROJECT ISSUE attachments Physicists report. END OF SECTION 13 49 00 FOR MDACC USE ONLY. 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