RADIATION SHIELDING DESIGN 2010
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1 RADIATION SHIELDING DESIGN 2010 ACMP 2010 SAN ANTONIO, TEXAS MAY 23, 2010 DANIEL G. HARRELL SHIELDING CONSTRUCTION SOLUTIONS, INC Shielding Construction Solutions 1
2 2010 Shielding Construction Solutions 2
3 THE DESIGN PROCESS Radiation Source & Equipment Shielding Design Shielding Materials Radiation Therapy Treatment Room Shielding Parameters Treatment Modality 2010 Shielding Construction Solutions 3
4 1. The Client Treatment Modality Use and Cost 2. Equipment Vendor Machine Energy - Space Requirements 3. Architect COMMUNICATION Available Space - Entry type - Direct, Maze, Mini Maze, Door Free 4. Shielding Vendor Material Options 5. Shielding Designer Physicist of Record - Parameters Applicable Codes THE PLAYERS 2010 Shielding Construction Solutions 4
5 1. Treatment Modality SHIELDING DESIGN THE TREATMENT ROOM Treatment Energy, Conventional, Stereotactic, TBI, IMRT, IGRT, etce 2. Components Isocenter, Equipment, Primary and Secondary Barriers, Penetrations, ns, Entry Type 3. Entry Types Direct Entry, Maze Entry, Hybrid Mini Maze, Door Free Entry, Shield Door Type 4. Unique Conditions Penetrations, Existing Shielding, Structural Obstructions, Access s to Work Area 5. Shielding Parameters Workload, Design Goal, Applicable Regulations, Adjacent Occupancies, Future 2010 Shielding Construction Solutions 5
6 TREATMENT ROOM TREATMENT MODALITY Stereotactic Conventional (w/o beamstopper) IMRT / IGRT Total Body Irradiation CyberKnife TomoTherapy 2010 Shielding Construction Solutions 6
7 TREATMENT ROOM 1. Isocenter 2. Equipment (Manufacturer & Space) 3. Primary Barrier (Direction & Width) 4. Secondary Barrier 5. Penetrations (MEP, Door) 6. Entry Type (Direct, Maze, Mini Maze, Doorless) COMPONENTS Shielding Construction Solutions 7
8 TREATMENT ROOM 1. Isocenter COMPONENTS Graphic Image Shielding Construction Solutions 8
9 TREATMENT ROOM 1. Isocenter 2. Equipment (Manufacturer & Space) 3. Primary Barrier (Direction & Width) 4. Secondary Barrier 5. Penetrations (Dosimetry Passage, MEP, Door) 6. Entry Type - Layout (Direct, Maze, Mini Maze, Doorless) COMPONENTS
10 TREATMENT ROOM ENTRY TYPE AND LAYOUTS Direct Entry Mini-Maze Entry Maze Entry Doorless Entry (double-maze) Direct Entry Mini Maze Entry Maze Entry Doorless Entry Doors can be either Swing type or Sliding type
11 TREATMENT ROOM DOOR TYPES Sliding Door Swing Door
12 1. Penetrations Dosimetry Passage Mechanical Openings Entry way (DOOR or DOOR FREE) Skylights 2. Existing Shielding Concrete Density 3. Structural Obstructions TREATMENT ROOM (OFTEN OVERLOOKED) UNIQUE Columns & Beams Existing Services (Communication, Gas, Electrical, etc) 4. Access, Delivery, Storage Moving the material into place CONDITIONS 2010 Shielding Construction Solutions 12 12
13 TREATMENT ROOM UNIQUE 1. Dosimetry Passage Best Location Oblique Angles 2. Mechanical Openings Location Shielding Around 3. Entry Way Layout protection Door Opening Head and Jambs Safety devices - interlocks 4. Skylights How and When Adjacent Occupancies and other Skylights CONDITIONS PENETRATIONS 2010 Shielding Construction Solutions 13 13
14 TREATMENT ROOM UNIQUE CONDITIONS PENETRATIONS Graphic Image 2010 Shielding Construction Solutions 14
15 TREATMENT ROOM UNIQUE 1. Existing Concrete When was it placed? What Density is it? How to Verify 2. Earth Backed Walls Which Walls have EARTH? How high does it go? 3. Occupancy Adjacent to the shielding walls What about Beyond? Nearest full occupancy CONDITIONS EXISTING SHIELDING 2010 Shielding Construction Solutions 15
16 TREATMENT ROOM UNIQUE CONDITIONS EXISTING SHIELDING Graphic Image 2010 Shielding Construction Solutions 16
17 TREATMENT ROOM UNIQUE 1. Columns CONDITIONS STRUCTURAL OBSTRUCTIONS Where are they? What are they made of? How do we shield around these? 2. Beams Where are they? What are they made of? How do we shield around these? 3. Communication or Electrical Services Could require costly interruption and rerouting Shielding around an existing service 4. Special (HIDDEN) Occupancies Service Tunnels Crawl Spaces 2010 Shielding Construction Solutions 17
18 TREATMENT ROOM UNIQUE CONDITIONS STRUCTURAL OBSTRUCTIONS Graphic Image 2010 Shielding Construction Solutions 18
19 TREATMENT ROOM UNIQUE CONDITIONS ACCESS TO THE WORK AREA 1. Where is the Proposed Treatment Room? All New construction with Full Access Attached to the outside of an existing building Trapped in a courtyard Up on a Second Story 2. Material Delivery PIP Trucks, Conveyors, cranes Modular Pallets, Forklifts, Pallet Jacks 3. Storage Fresh (Wet) Concrete can not be stored Pre-Cast modular Shield Block can be stored Weather Conditions working in the COLD and WET 2010 Shielding Construction Solutions 19
20 TREATMENT ROOM UNIQUE CONDITIONS ACCESS TO THE WORK AREA Graphic Image 2010 Shielding Construction Solutions 20
21 SHIELDING RADIATION 1. Radiation Therapy Radiation Shielding We are treating patients with radiation therapy... and we are protecting people with shielding The Sources Radiation & Equipment Internal Radiation Therapy (Brachytherapy, LDR, HDR, Perm Implant) External Beam Radiation Therapy Linear (Cobalt, Gamma Knife) Linear Accelerators (linacs) (Varian, Elekta, Siemens, TomoTherapy, Accuray CyberKnife, Novalis, etc.) Circular Accelerators & Particle Therapy (Proton, Carbon, Cyclotron, Synchrotron) 2010 Shielding Construction Solutions 21
22 SHIELDING PARAMETERS 1. How Much Radiation Shielding?... the TVL The required amount of Radiation Shielding is a direct result of your calculations for TVL of attenuation based on: Source Energy and Quality (primary, leakage, scatter) Patient Workload Distance from Isocenter to the Adjacent Areas (point of survey) Occupancy (Time) of Adjacent Areas (control, office, parking, etc.) Permissible Exposure Levels (NCRP, state and local requirements) 2. Selection of Radiation Shielding Material Best match to Satisfy the TVL requirement (space, cost, availability) Photons and/or Neutrons Future plans (upgrades, removability) 2010 Shielding Construction Solutions 22
23 SHIELDING MATERIAL OPTIONS DENSITY MATTERS AIR WATER CONCRETE EARTH DenseCRETE ShieldBLO CK 325 STEEL LEAD pcf g/cm ³ Shielding Construction Solutions 23
24 RADIATION SHIELDING DENSITY MATTERS AIR WATER CONCRETE EARTH DenseCRETE ShieldBLO CK 325 STEEL LEAD pcf g/cm ³ Shielding Construction Solutions 24
25 SHIELDING THICKNESS FOR 6TVL ATTENUATION MACHINE ENERGY 2010 Shielding Construction Solutions 25
26 SHIELDING THICKNESS FOR 6TVL ATTENUATION 2010 Shielding Construction Solutions 26
27 SHIELDING THICKNESS FOR 6TVL ATTENUATION Shielding Construction Solutions 27
28 RADIATION SHIELDING DenseCRETE ShieldBLO CK 325 CONCRETE AIR W ATER EARTH pcf 0 g/cm ³ Shielding Construction Solutions STEEL LEAD
29 RADIATION SHIELDING MATERIAL SELECTION : BEFORE THE isocenter RADIATION SOURCE SHIELDING OPTIONS $$$$$$ Lead & Borated Polyethylene $$$$ $$$ $$ $ Lead & Concrete TVL DenseCRETE & ShieldBLOCK Concrete Earth Backfill Required Shielding Attenuation [W & d = TVL] Each Material has its own TVL Twice the density means half the thickness Cost of Shielding Materials (Installed) 2010 Shielding Construction Solutions 29 29
30 SHIELDING DESIGN WORKSHEETS Material Data Densities Tenth Value Layers Design Sketches Parameters Distances Worksheets Summary of Data TVL Requirements Graphic Image 2010 Shielding Construction Solutions 30
31 isocenter RADIATION SOURCE SHIELDING OPTIONS $$$$$$ Lead & Borated Polyethylene Lead & Concrete $$$$ $$$ $$ $ SHIELDING DESIGN DenseCRETE & ShieldBLOCK Concrete Earth Backfill KNOW YOUR TVLS SAMPLE Graphic Image Shielding Material Data Attenuation TVL Material Options Barrier Thickness Custom Systems Combination Special Density Shielding Design Sketch Shielding Worksheets 2010 Shielding Construction Solutions 31 31
32 DESIGN Shielding Material Data Shielding Design Sketch Specific Points Use & Occupancy Distance Obliquity Effective Thickness Unusual Conditions Shielding Worksheets 2010 Shielding Construction Solutions 32
33 DESIGN Shielding Material Data Shielding Design Sketch Specific Points Use & Occupancy Distance Unusual Conditions Beams & Columns Penetrations Effective Thickness Shielding Worksheets 2010 Shielding Construction Solutions 33
34 Graphic Image SAMPLE DESIGN ATTENUATION (TVLS) Shielding Material Data Shielding Design Sketch Shielding Worksheets Location Description Beam Quality Parameters W + U + T +α + +P + d TVL s s REQUIRED Photon Neutron 2010 Shielding Construction Solutions 34 34
35 isocenter RADIATION SHIELDING MATERIAL SELECTION : AFTER THE RADIATION SOURCE SHIELDING OPTIONS $$$$$$ Lead & Borated Polyethylene $$$$ $$$ $$ $ Lead & Concrete TVL DenseCRETE & ShieldBLOCK Concrete Earth Backfill Attenuation Thickness can be determined IMPACT can be reviewed with the Architect Single material vs combination of materials Method of installation can be reviewed (PIP vs Modular) 2010 Shielding Construction Solutions 35 35
36 RADIATION SHIELDING OTHER CONSIDERATIONS The Total Cost of the Shielding includes: Foundations, Installation, Finishes, Service Contracts System of Installation Modular vs. PIP (pumped, conveyed or craned) Manufacture (On-site vs. Pre Fabricated) Delivery & Storage Accelerated Depreciation Savings (possible) The Value of the Space (Savings) $300-$500/sq $500/sq ft 2010 Shielding Construction Solutions 36
37 RADIATION SHIELDING DESIGN MISTAKES CAN 2010 HAPPEN BUT THEY NEED NOT HAPPEN TO YOU! UNDERSTAND THE PROCESS KNOW YOUR OPTIONS UNDERSTAND THEIR IMPACT DESIGN THE BEST RADIATION SHIELDING SOLUTION FOR YOUR CLIENT NOW AND INTO THE FUTURE Shielding Construction Solutions 37 37
38 RADIATION SHIELDING DESIGN 2010 QUESTIONS? 2010 Shielding Construction Solutions 38
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