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.