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Home My WebLink AboutB14-0025 Physicist Report Michael J. Bailey,M.S. Colorado Gyongyver Bulz,M.S. Kate Dikeman,M.S Blake Dirksen M.S ' ' Gayle Harnisch,M.S. s s oclate s ln Kenneth Harper,M.S. Stephanie Franz,M.S. Medic al Gregory L. Gibbs,M.S. Dan Marvel,M.S. � Richard McKeown,M.S. P��C�1 (�C� David Pascoe,M.S. 1� ►�lv►� Jason Senn,M.S. Jennifer Stickel,Ph.D. Jack Towery III,M.S. Gerald A.White Jr.,M.S. Diplomates American Board of Radiology Brad Lofton,M.S. Vail Summit Orthopedics 108 S. Frontage Road West,Suite 300 Vail, Colorado 81657 Tel:970.476.7220 To I I-free: 1.888.266.3363 Fax:970.479.9166 Attn: Chip Webb, Dir 2/25/14 Re: Shielding design Digital Rad room revised Dear Mr. Webb Below you will find the revised shielding requirements for the installation of a radiographic unit at the Vail facility, address above. The radiographic room is on the second floor, with occupied space above and below. The equipment has the potential to develop a workload of <200 patients per week with <2 exposures per patient, Approximately 400 mAmin/week. This workload allows for growth of the practice. The operator location will be in the control booth. The operator will view the patient thru a leaded plastic/glass window. The room has a standard wall bucky and a second digital stitching bucky for upright extremity views. Shielding is designed to meet Colorado State requirements and provides a design level of 10 mR per week maximum to any exposed worker and 2 mR per week to any member of the general public. I have included a copy of our shielding notes, as well as the Colorado requirements for operator location requirements. These documents should be considered a part of this report. Lead Requirements: a-b: wall /window ctl booth, secondary controlled barrier, full occupancy, estimated 8 feet from the patient; 0.6 mm lead equivalent added or 2.0 inches concrete. The design of the booth shall be such that the operator's expected position when viewing the patient and operating the x-ray system is at least 18 inches (0.457 m) from the edge of the booth. 1121 Terrace Road • Colorado Springs,CO 80904 • Phone 719-471-7425 • FAX 719-635-4524 b-c:wall work room, primary uncontrolled barrier (2nd bucky) 25% use factor, full occupancy during exposure, estimated 6 feet from the tube to cast room; 1.9 mm lead (1/16"+1/32" lead) added or 5.8 inches of concrete. Segment b-c should be four feet wide seven feet tall and centered behind the wall bucky. c-d: wall work room, secondary uncontrolled barrier, full occupancy, estimated 5 feet from the patient; 0.82 mm (1/32") lead equivalent added or 2.6 inches of concrete. d-e: wall exam room, secondary uncontrolled barrier, 1/4 occupancy, estimated 4 feet from the patient; 0.54 mm (1/32") lead equivalent added or 2.0 inches concrete. e-f: wall hallway, secondary uncontrolled barrier, 1/4 occupancy, estimated 5 feet from the patient; 0.43 mm (1/64") lead equivalent added or 1.5 inch of concrete. f-g: wall hallway, primary uncontrolled barrier 25% use factor, <1/4 occupancy during exposure, estimated 6 feet from the tube; 1.4 mm (1/16") lead equivalent added or 4.4 inches of concrete. Segment f-g should be four feet wide seven feet tall and centered behind the wall bucky g-h: door/wall hallway, secondary uncontrolled barrier, 1/4 occupancy, estimated 5 feet from the patient; 0.43 mm (1/64") lead equivalent added or 1.5 inch of concrete. h-i: wall cast room, secondary uncontrolled barrier, 1/4 occupancy, estimated 8 feet from the patient (bucky); 0.3 mm (1/64") lead equivalent added or 1 inch concrete. Upstairs: fully occupied secondary uncontrolled barrier. Floor materials will provide adequate attenuation. Downstairs: primary uncontrolled barrier, full occupancy, use factor<50%, estimated 10 feet from the Xray tube; <1.8 mm lead equivalent added or<5.5 inches concrete. Floor and table materials will provide adequate attenuation. The floor is a modern blgd, with approximately 4 inches of concrete on ribbed metal. These specifications are for a particular room layout and machine position. If there are any changes in design, they should be reviewed by a qualified expert to be certain the shielding remains adequate. These specifications should be kept on file at the clinic. In addition, the clinic must have on file a scale drawing showing the "as built" shielding, including any structural shielding such as brick, concrete, etc. with all thickness shown. Thanks for the opportunity to review the shielding. If any questions arise, please give me a call. Best Regards, Richard McKeown M.S. ABR Certified Radiological Physicist, 719-337-1988 mobile CC Karol L. Whitlow, R.T.(R) Director of Sales Medical Imaging Technologies 875 Valley Street Colorado Springs, CO 80915 ofc-719-520-1511 cell-719-930-3508 www.medicalimagingtech.com Lf--1 � � � I � � � Q --1 I _�y� 4,��, � �... � � j -� 4�� /fG� / - � � r i� � — � � � � I I � ,� � �_, �' � ° f cAs ExA� ❑ ��`�� . ❑ .� zo4 � � x-�aY � . � � �-�- � HALL za� All IRCr �""" - � .- �- - ' ' �� X-Ray Shielding Notes 1. Lead barriers should extend to a height of 7 feet unless otherwise specified. 2. All seams and joints should be overlapped to adjacent shielding. 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. Special baffle designs may be necessary for some ducts or large penetrations. Design of shielding of any major penetrations should be reviewed by a qualified radiation physicist. 4. All doors should be shielded with the same lead thickness as the adjacent wall. 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 lock sets and latches should be lead lined. All doorframes should be lead lined to overlap the lead in the door and adjacent walls. 5. All windows in shielded rooms should be lead glass with equivalent thickness the same as the wall they are in, unless otherwise specified. All window frames should be lead lined to overlap adjacent wall. 6. The adequacy and proper installation of radiation barriers should be verified by a qualified expert conducting a radiation protection survey after the X-ray machine has been installed. 7. Doors to toilets or dressing rooms opening into the X-ray room should be provided with one- way opening latches to be opened only from the X-ray room side. 8. A red warning light, energized only when the machine is in operation, should be provided outside each entrance into the X-ray room. 9. 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. 10. All rooms are designed for a specific application and for a specific location of equipment and control functions. Any change in: A. Applications B. Location of equipment C. Traffic patterns in the room D. Location of control functions E. Occupancy or utilization of adjacent areas should be reviewed by a qualified expert for possible changes in shielding requirements. 11. Any barriers specified in concrete shall have a density of 147 pounds per cubic foot (2.35 grams/cc). Any structures penetrating or embedded in the concrete (for example conduits, cable troughs, ducts, etc.) will require compensating shielding placed behind or around structure. This could be lead shielding of sufficient thickness to provide comparable shielding to the concrete displaced. Colorado Associates in Medical Physics 1121 Terrace Road Colorado Springs, CO 80904 (719)-471-7425