Radiation Shielding design.pdfSeptember
6th j
X -Ray Room
HEAL11-1 PHYSICS INC
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Edmonds Family Chiropractic
23122100thAve. W.
Edmonds, WA 98020
Andrew Conway, MHP
Physics Associate
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Phone(360) 736-6066 CORAV IN '11HEALI.T.1 13HYS14....,S, INC,
F= (360) 736 7293 www.corwinlip,con).
P.(','). Box 1707
Centralia, W.A. 9853 t
Radiation Shielding Design September 6rh, 2016
Edmonds Family Chiropractic
23122100`` Ave. W.
Edmonds, WA 98020
Shielding Design Summary
Shielding calculations were performed for the new x-ray system that will be installed at
Edmonds Family Chiropractic in Edmonds, Washington. A summary chart of the
required lead shielding is at enclosure 1. A drawing of the room (NTS) is at enclosure 2.
The following is a detailed explanation of the shielding required on each wall.
Summary of Required Shielding
The following lead shielding is the minimum amount of lead required to reduce radiation
exposures to below the current regulatory limits. Installation of lead thickness greater
than those specified below is acceptable. L)nless noted will lead must extend from the
floor to a height of seven feet.
Chest Receptor/Massage Room — Wall A. The Chest Receptor Wall requires 1.58 mm
lead directly behind the chest receptor. The 1.58 mm lead must extend at least l foot past
each vertical edge of the chest receptor to a height of 7 feet. The remainder of the wall
requires 0.79 mm lead shielding.
Hallway Wall and Door — Wall B. The existing two layers of 5/8 inch gypsum
wallboard on the Hallway Wall and a standard solid core wood door provide sufficient
shielding. No additional lead shielding is required.
Storage Wall — Wall C. The existing two layers of 5/8 inch gypsum wallboard on the
Storage Wall provides sufficient shielding. No additional lead shielding is required.
Exterior Walkway Wall and Window — Wall D. The existing layer of 5/8 inch gypsum
wallboard and standard glass window on the Exterior Walkway Wall provide sufficient
shielding. No additional lead shielding is required.
Control Wall and Window — Wall E. The Control Wall requires 0.79 mm lead
shielding. The control booth window requires at least 0.79 mm lead -equivalence and
must be at least one foot by one foot. Please note that the x-ray exposure switch must be
mounted in such a manner that it is impossible for an operator to make exposures from an
unprotected area. This can be accomplished by placing the switch at a permanent
position at least 40 inches from the edge of the control booth. Also, it is required that at
least 7.5 square feet of unobstructed floor space be available in the protected control
booth area.
Exterior Alley/Drive Way Wall — Wall F. The existing layer of 5/8 inch gypsum
wallboard on the Exterior Alley Wall provides sufficient shielding. No additional lead
shielding is required.
CORWIN HEALTH PHYSICS INC
Radiation Shielding Design
Edmonds Family Chiropractic
23122100`' Ave. W.
Edmonds, WA 98020
September 6"', 2016
Ceiling/Floor. There is no occupancy above or below this x-ray room. Therefore, no
lead shielding is required on the floor or ceiling.
Methods and Assumptions
The above shielding recommendations were based on the following information:
The proposed x-ray system is a radiographic system with chest receptor only. The
facility will use a Digital Radiographic (DR) system. Calculations were done for a
DR system.
The maximum weekly exposure rates for controlled areas are 0.10 mGy/week and for
uncontrolled areas is 0.02 mGy/week.
The estimated workload of approximately 5 patients per week was provided by the
center. However, Washington DOH and Corwin Health Physics require a minimum
patient work load of 10 patients per week be used for all shielding designs. This
maximum estimated workload (10 pt/week) was used for calculating the required
shielding. The occupancy of each room is noted on the enclosed detailed summary
sheet and diagram.
The existing shielding and occupancy surrounding the room was determined from
information provided by the center. If the existing shielding or occupancy is different
than noted, additional lead shielding may be required.
The primary reference for these shielding calculations is NCRP Report 147,
Structural Shielding Design for Medical X -Ray Imaging Facilities.
Please note the f allowing:
These recommendations are based on the workload and occupancy of rooms provided
at the time of these shielding design calculations. If changes occur in the occupancy
of the rooms next to this x-ray room, if the type of x-ray system is changed, or if the
workload increases, additional shielding may be required.
Please keep a copy of this shielding plan at your facility indefinitely.
Please note that an anode -up orientation of the x-ray tube is optimal, but not required,
for wall Bucky configurations.
CORWIN HEALTH PHYSICS INC
Radiation Shielding Design
Edmonds Family Chiropractic
23122100'/A ve. W.
Edmonds, WA 98020
September 6`', 2016
DOH requires the following in order for them to begin conducting the shielding design
review:
1. If this is a new facility or a new room, DOH requires you to register with State of
Washington
Business Licensing Service. The registration process is located at
m. The licensing process can be completed before
the shielding design is completed.
2. DOH prefers that you submit the shielding design AND the Shielding Plan
Review Cover Sheet form via email to xrti'r@"i),d+.rh wa.uov. However, plans may
also be submitted via mail (address below)..l"rior to submission picase ensure that
yoti ¢' view the shielding a� esi n and edit the plan review lo>rni as
necessary, Make sure the correct name/contact information is on the review
form.
State of Washington, Department of Health
X -Ray Control
PO Box 47827
Olympia, WA 98504-7827
3. A check for the amount of $344 must be sent in to the Department of Health
Revenue Accounting office (address below) to cover the DOH review fee (or
$1000 for expedited review).
Department of Health
Revenue Accounting
PO Box 1099
Olympia, WA 98507-1099
They will not begin the review of the shielding design until the check is received. DOH
also now has a penalty fee of $656 for installing prior to their approval. The DOH allows
30 days for their review. Any questions regarding this process can be directed to
Matthew Bullock at DOH X-ray control, at (360) 236-3267 or
matthew.bullock@doh.wa.gov.
CORWIN HEALTH PHYSICS INC
Radiation Shielding Design
Edmonds Family Chiropractic
23122100" Ave. W.
Edmonds, WA 98020
September 6�4, 2016
Thank -you for allowing us to perform your shielding calculations. If you have any
questions, please call me at (360) 736-6066.
Andrew Conway, MHP
Physics Associate
CORWIN HEALTH PHYSICS INC
Enclosures:
Shielding Summary
Diagram of Room
Appendix A — Recommendations for Shielding Penetrations
Appendix B — Schedule of Commercial Lead Shielding
CORWIN HEALTH PHYSICS INC
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Appendix A — Recommendations for Shielding Penetrations
Shielding Screw/Nails: Penetrations made by screws/nails do not require lead "tabs" to
cover the top of the screws/nails. The steel nails/screws generally attenuate radiation
equally, or more effectively than the lead displaced by the screws/nails.
Shielding Joints: The joints between lead sheets should be constructed so that their
surfaces are in contact with an overlap of not lass than I cm. This can be accomplished
by using lead battens, or by using drywall that is manufactured with the lead sheet
extending beyond the edge of the drywall for adequate overlap.
Shielding Penetrations: Air conditioning ducts, electrical conduit, plumbing, and other
infrastructure will penetrate shielded walls, floors, and ceilings. The shielding of the x-
ray room shall be so constructed that the protection is not impaired by these openings or
by service boxes, etc., embedded in barriers. The duct/conduit shielding thickness shall
be equivalent to the displaced shielding thickness. Below are general shielding details for
duct/pipe penetrations into a shielded surface where H is the diameter of the penetration.
1. Straight pipe/conduit penetration: Situations where there is aslraghf pipe/conduit
penetrating a lead shielded surface require lead to line (wrap) the pipe/conduit twice
the distance as the diameter/thickness of the' or conduit. See Detail ] below.
Detail 1:
CORWIN HEALTH PHYSICS INC
2. Curved elbow penetration: Situations where there is a curved pipe/conduit
penetrating lead shielding requires lead to line (wrap) to line the entire top/backside
of the elbow and pipe for :3 tines the distance of the diameter of the opelling. See
Detail 2 below.
Detail 2:
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3. Flat Panel Penetrations (electrical panels etc.). Flat panel penetrations can be
shielded by either wrapping the entire structure (panel/box) being installed or by
shielding behind the panel/box. If the lead shielding is installed behind the panel, the
lead must extend beyond each side of the panel (penetration) by twice the thickness of
the wall. For example, if the wall is 4 inches thick, the lead shielding must extend 8
inches beyond each edge of the cut-out section of the wall.
CORWIN HEALTH PHYSICS INC
4. 90 degree elbow running out of the wall: Situations where there is a 90 cls' wee
elbow penetrating a lead shielded surface requires lead to line the top of the elbow up
to the 90 degree turn, and then the back side of the pipe for twice the distance of the
diameter/thickness of the pipe PLUS the thickness of the wall. See Detail 3 below:
Detail 3:
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The above recommendations and details are adequate for shielding most common
shielding penetrations. There may be exceptions where these methods are not appropriate
for providing adequate radiation protection. Please contact Corwin Health Physics if there
are other questions on how to appropriately shield a space.
Reference: The primary reference for these recommendations is NCRP Report 147,
CORWIN HEALTH PHYSICS INC
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gypmur wallboard on the
Uixtetior Alley Wall (Wall F)
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provides• sufficient shielding.
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teal directly behind the chest receptor. The 1.58 turn
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Aanendix B — Schedule of Commercial Lead Shielding
Thickness
Thickness
Weight in Pounds per
(mm)(inches)
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CORWIN HEALTH PHYSICS INC