S06 - Appendix E - Physicist Report.pdf

Radiation Physics

Consulting Service, LLC Ph. (920) 585-2603

May 1, 2020

Guidon Design, Inc.

Attn: David Vallandingham 1221 N. Pennsylvania St.

Indianapolis, IN 46202

Re: Radiation shielding design for a GI GU Fluoroscopy suite at the VA Medical Center, Milwaukee, WI

This Fluoroscopy imaging suite radiation shielding design meets the minimum radiation exposure requirements following the radiation protection standards published in the National Council on Radiation Protection (NCRP) Report No. 116, ‘Limitation of Exposure to Ionizing Radiation’, and the radiation shielding design methods published in National Council on Radiation Protection (NCRP) Report No. 147, ‘Structural Shielding Design for Medical X-Ray Imaging Facilities’. The protective barriers were designed with a weekly design goal limiting radiation exposure to persons in controlled areas to

0.1 mSv, and persons in uncontrolled areas to 0.02 mSv. Where patient volumes or occupancy was unknown, a conservatively safe estimate was used for the purposes of completing the radiation shielding design calculations.

If you have any questions, please feel free to contact me at (920) 585-2603 or e-mail me at Scott.Moon@thedacare.org

Respectfully submitted, Scott D. Moon, M.S.

DABR, DABMP, Radiation Oncology and Diagnostic Imaging Medical Physics Radiation Physics Consulting Service, LLC

ACCOMPANYING 36C25221B0002 0002

General Radiation Shielding Requirements;

1.) Shielding materials (i.e. Lead) for wall barriers must extend from the floor to a minimum height of 2.1 meters (7 feet). Shielding materials must overlap at the seam or be backed with equivalent material. All receptacles, utility boxes, and other wall penetrations must also be backed with equivalent shielding material to which it displaced. The shielding materials should extend on all sides of the receptacle box and overlap with the shielding material in the wall. Nail and screw heads, and other small penetrations, need not be capped with equivalent shielding material.

2.) The shielding value of the control room observation window, door, and frames must be equivalent to the shielded barrier wall in which it is mounted. This may require frames backed with Lead.

3.) The edge of the control station observation window should be at least 18 to 24 inches from the edge of the open barrier (subject to local regulatory requirements). The operator must not be exposure to once scattered radiation. It is recommended that the control barrier window be at least 45 × 45 cm (about 18" x18") and centered 1.5 m above the finished floor. The operator must have a clear view of the patient and entrance door. A door interlock may be required for blind entrance doors.

4.) The cost of increasing the shielding beyond the minimum value often represents only a small increase in cost during initial construction and may actually save the facility considerable expense in the long run by reducing or eliminating the potential need for future shielding evaluations due to increased utilization or equipment changes. For example, with Leaded gypsum wallboard, the product with a greater thickness may have equivalent expense or even be less costly. In those situations it is always permissible to install a product with a greater shielding property. Leaded wallboard may be installed directly over the existing standard construction gypsum wallboard.

VA Medical Center, Milwaukee, WI. GI GU Fluoroscopy Suite (Siemens Artis Zee)

Wall & Window A. A Wall and Window with 1/64 in. (0.4 mm) Lead equivalent material will provide adequate protection to the Control Room, Data Room, and corner of the Endoscopy procedure room beyond.

Door A. A door constructed of 18 gauge Steel and 1/64 in. Lead equivalent glass, if a window is present, will provide adequate protection. Alternately, a Wooden door with 1/64 in. Lead equivalent material and a Steel door frame would be acceptable.

Wall B. A Wall constructed with 1/2 in. (12.5 mm) Gypsum Wallboard will provide adequate protection to the very low occupancy areas adjacent. Alternately, a wall with 1/64 in. Lead equivalent material is also acceptable.

Wall & Door C. A Wall and Window of 1/64 in. (0.4 mm) Lead equivalent material will provide adequate protection to the Corridor. A door constructed of 18 gauge Steel and 1/64th in. Lead equivalent glass, if a window is present, will provide adequate protection.

Alternately, a Wooden door with 1/64 in. Lead equivalent material and a Steel door frame would be acceptable.

Wall D. A Wall with 1/32 in. (0.79 mm) Lead equivalent material will provide adequate protection to the adjacent Endoscopy procedure rooms.

Floor/Ceiling Deck. Standard construction with Concrete decking will provide adequate protection to the unspecified areas above and below. Shielding calculations assumed 100% occupancy as an overly conservative and safe estimate.