Loading...
HomeMy WebLinkAboutB17-0092_PHYSICIST ALT BID_1491499620.pdf February 10, 2017 Ryan Collier, AIA, EDAC, LEED AP BD+C Senior Architect Davis Partnership Architects 2901 Blake Street, Suite 100 Denver, Colorado 80205-2303 Dear Sir, Enclosed are the following documents for the new Nuclear Medicine Suite at Vail Valley Medical Center, Vail, Colorado:  Radiation Shielding Design Report – SPECT/CT Suite Option  Shielding Installation Notes This design is provided, per your request, for later installation of a Siemens Symbia Intevo SPECT-CT unit or equivalent. I evaluated the current models that are available (Excel, 2, 6, 16) and shielded the room for the higher slice and higher workload machine. This analysis is based on information, both written and oral, provided by yourself and KC Baker, former Radiology Director. The NM cut sheet sent to me on 02/07/17 is the final plan I used for the design. Wall sections are indicated by reference letters on the drawing and the recommended shielding for each barrier is shown in the attached tables. In this design, I followed the methods outlined by NCRP Report No. 147. The goal was to shield to 0.02 mGy per week air kerma (1 mGy/year) in uncontrolled areas and 0.1 mGy per week air kerma (5 mGy/year) in controlled areas. If you have any questions, please feel free to call. Sincerely, Joel McAllister, M.S., DABR, CHP, DABSNM Centennial Medical Physics, LLC Qualified Expert #120363 (913) 579-6747 cell LOCATION:Vail Valley Medical Center DATE:February 10, 2017 181 West Meadow Drive ROOM:SPECT-CT Vail, Colorado 81657 EQUIPMENT:2-16 slice SPECT-CT Scanner WEEKLY WORKLOAD:High estimate for future use QC and 100 CT (Body) MINIMUM SHIELDING REQUIRED WALL SEGMENT PROTECTED AREA REQUIRED ADDITIONAL SHIELDING2 COMMENTS Control Area (restricted; occupancy = 1) Waiting/Corridor (unrestricted; occupancy = 0.2) Restroom/Janitor's Closet (unrestricted; occupancy = 0.2) ESR/Soiled Holding/Pt Toilet including door and (unrestricted; occupancy = 0.2)door frame NM Entrance/Pt Injection including door and (unrestricted; occupancy = 0.5)door frame Occupiable Space (unrestricted; occupancy = 1) Occupiable Space (unrestricted; occupancy = 1) 2 designation of thickness in pounds is in units of lb/ft2 NOTES: See attached Shielding Installation Notes for guidelines on installation of lead barriers. Any changes to the type of equipment, occupancy of adjacent areas, or application of the equipment may result in a change in the shielding requirements and should be reviewed by a qualified physicist. PHYSICIST:__________________________________________ Joel McAllister, M.S. Certified, American Board of Radiology Colorado Department of Health Qualified Expert #120363 EA 1.12 mm Lead DE Floor Ceiling 1/16" (4-pound) Lead RADIATION SHIELDING DESIGN REPORT 1/16" (4-pound) Lead None None 1/16" (4-pound) Lead 1/16" (4-pound) Lead 1/16" (4-pound) Lead BC AB CD including doors, window, and frames 3.1 inches Concrete 3.1 inches Concrete 0.97 mm Lead 1.13 mm Lead 0.97 mm Lead 0.82 mm Lead NUCLEARMEDICINECAMERA105AA-401A.1A6A2A5A41/CSOILED HOLD105BBED SHIELDING INSTALLATION NOTES 1. Lead barriers shall extend to a height of 7 feet above the finished floor unless otherwise specified. 2. All joints between lead sheets should be constructed so that their surfaces are in contact and have an overlap of at least 0.5" such that no gaps exist. 3. All penetrations of the lead shielding (electrical outlets, light fixtures, switches, pipes, ducts, etc.) must be shielded by placing equivalent lead shielding behind the penetration with sufficient overlap to prevent a direct "line-of-sight" from the radiation source. No additional shielding is necessary for nail or screw holes used to secure the shielding, provided the nail or screw remains in the hole as a part of the wall. 4. All doors shall be shielded with the same lead thickness as the adjacent wall unless otherwise specified. Doors should extend as close to the floor as possible. When doors are exposed to direct radiation, special designs may be necessary to prevent excess scatter of radiation under the door. All doors that require lead should have lead lined lock sets and latches and the door frames should be lead lined to overlap the lead in the door and adjacent walls. 5. All windows in the shielded room shall be leaded glass, equivalent to the adjacent wall unless specified otherwise. All window frames shall be lead lined to overlap the adjacent wall. 6. Doors to toilets or dressing rooms opening into x-ray rooms should be provided with one-way opening latches to be opened only from the x-ray room side, unless the toilet or dressing room is accessible only from that x-ray room. 7. A permanent placard should be mounted by the contractor in the room specifying the amount and type of shielding in each of the walls. 8. Any film storage areas around the x-ray installation may require additional shielding of the storage bin to provide for extended storage of film without fogging. 9. The adequacy and proper installation of radiation barriers shall be verified by a qualified expert conducting a radiation protection survey after the x-ray machine has been installed. 10. All rooms are designed for a specific application and for a specific location of equipment and control functions. Any future modification or renovation of an existing x-ray facility, or installation of a new x-ray machine in an existing x-ray facility, shall be reviewed by a qualified expert for determination of shielding requirements. Note: use of the word “shall” indicates a requirement based on current Colorado Department of Public Health and Environment regulations.