CMC Edwards Rad Shielding Report-Update final.pdf

(719) 471-7425 www.campphysics.com office@campphysics.com

X-RAY SHIELDING DESIGN ANALYSIS

AND RECOMMENDATIONS

Update – this report supersedes report dated September 16, 2024

PROJECT:

Sharp FM Radiiographic System Radiology Lab Colorado Mountain College 150 Miller Ranch Road Edwards, CO 81632

CONTACTS:

Gwen Gilley, Principal Architect Hord Coplan Macht

(303) 222-0228 GGilley@hcm2.com

Dr. Amy Connerton Assistant Dean of Instruction

(970) 569-2970 aconnerton@coloradomtn.edu

Shielding Analysis Completed by:

Stephanie C Franz, MS, DABR, QE #121 Date Diagnostic Medical Physicist Colorado Associates in Medical Physics

Reviewed by:

Nathan Busse, MS, DABR, QE #238 Date Diagnostic Medical Physicist Colorado Associates in Medical Physics

Dr. Amy Connerton Date

All required shielding is identified on attached layout. Calculations and assumptions are outlined in the report. For further information, please call Stephanie Franz at (303) 817-1108 or email at s.franz@campphysics.com.

04/10/2024

Nathan Busse (Oct 6, 2024 08:59 MDT) Nathan Busse 06/10/2024

Dr. Amy Connerton (Oct 6, 2024 17:20 MDT) Dr. Amy Connerton 06/10/2024

RADIOGRAPHIC SHIELDING

PREFACE

These calculations are done according to, and consistent with recommendations contained in the National Council on Radiation Protection and Measurements (NCRP) Report No. 147 “Structural Shielding Design for Medical X-Ray Imaging Facilities” and Report No. 151 “Structural Shielding Design and Evaluation for Megavoltage X- and Gamma-Ray Radiotherapy Facilities”. The calculations herein are based on a design limit of 20 μGy/week to members of the general public and 100 μGy/week to occupationally exposed workers whose dose is monitored. This is consistent with 10 CFR Part 20, State of Colorado Regulations 6 CCR 1007, and with the International Commission on Radiological Protection Publication No. 26 to keep exposures "As Low As Reasonably Achievable" (ALARA).

This shielding analysis applies to the specified room layout, application, workload, and occupancy of surrounding areas. If there are any changes to any of these conditions, the shielding must be re-evaluated by a Qualified Expert (QE).

BACKGROUND INFORMATION AND ASSUMPTIONS

Standard Assumptions

• Walls are assumed to include two 5/8 inch gypsum sheets, with a 3 inch interspace.

• Windows are assumed to be glass or acrylic. Windows are assumed to have zero lead equivalence.

Facility Description

• Multi-story building, x-ray room on the first floor.

• Floor to floor distance of 12 ft assumed.

• Floor construction: at least one inch of normal density concrete in the floor above is assumed.

Occupancy

• Full occupancy above the x-ray room is assumed. First floor is slab on grade.

• Refer to the attached diagram for occupancy adjacent to the x-ray room.

Workload

• For x-ray: 100 radiographic exposures (equivalent to 50 patients) per week.

SHIELDING SPECIFICATIONS

1. The control room window requires a minimum of 6 mm plate glass.

2. The door may be any type of door. Shielding is not required.

3. Please refer to the enclosed color-coded diagram for the specified shielding.

4. It is important to note that the recommended shielding is the minimum thickness required. However, it may turn out that a thicker lead is less expensive or more easily available. In that case, it is advisable to use the thicker lead as a cost-effective alternative.

5. Records of shielding must be maintained by the facility, available for inspection, as required by 6CCR 1007-1 Part 6, RH 6.3.2.3.

SHIELDING NOTES

1. Lead barriers should extend to a height of 7 feet unless otherwise specified.

2. All lead seams and joints should be overlapped with adjacent shielding. Screw holes created while hanging the lead do not require lead caps.

3. All penetrations of the lead shielding (electrical outlets, light fixtures, locksets, 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" path from the x-ray tube or patient. Special designs may be necessary for large penetrations. Design of shielding for major penetrations should be reviewed by the

QE.

4. All doors should be shielded with lead thickness equal to or greater than that of the adjacent wall. Doors should extend as close to the floor as possible. Locksets and door frames must also provide equivalent lead protection. Often steel doors can be substituted for lead lined doors. Consult the QE if you wish to pursue that option.

5. Windows must have a lead equivalence equal to or greater than that of the wall in which they are mounted. Window frames must also be shielded to overlap both the window and adjacent wall. If only minimal shielding is required, plate glass may be specified. If so, special attention must be given to transparency of laminated sheets of glass. Windows must be sized and positioned so that operators of various heights may view the patient.

6. A survey should be conducted by a registered medical physicist to verify adequacy and proper installation of shielding, x-ray equipment, and radiation safety program within 3 months of the installation. For CT and fluoroscopy rooms, the survey should be completed prior to patient exams.

7. Any barriers specified in concrete shall have a density of 147 lbs/cu ft unless otherwise specified. Any structures embedded in the concrete (conduits, switchboxes,etc.) may require compensating shielding. Barriers specified in wallboard should be sheets of 5/8" or thicker type "X" wallboard with seams arranged in a non-overlapping fashion.

DESIGN REQUIREMENTS FOR AN OPERATOR'S BOOTH

(From Colorado Department of Public Health and Environment Regulations, Part 6 Appendix 6B)

6B.1 Space Requirements:

6B.1.1 The operator shall be allotted not less than 0.7 m2 (8 ft2) of unobstructed floor space in the booth.

6B.1.2 The operator's booth may be of any geometric configuration with no dimension less than 0.6 m (2 ft).

6B.1.3 The space shall be allotted excluding any encumbrance by the x-ray control panel, such as overhang, cables, or other similar encroachments.

6B.1.4 The booth shall be located or constructed such that unattenuated scatter radiation originating on the examination table or at the wall cassette cannot reach the operator's location within the booth.

6B.2 Structural Requirements:

6B.2.1 The booth walls shall be permanently fixed barriers at least 2 m (6.5 ft) high.

6B.2.2 When a door or movable panel is used as an integral part of the booth structure, it must have an interlock that will prevent an exposure when the door or panel is not closed in its shielding position.

6B.2.3 Shielding shall be provided to meet the requirements of Part 4.

6B.3 Viewing System Requirements:

6B.3.1 Each booth shall have at least one viewing device that will:

(1) Be so placed that the operator can view the patient during any exposure, and

(2) The device shall be so placed that the operator can have full view of any occupant of the room and should be so placed that the operator can view any entry into the room. If any door that allows access to the room cannot be seen from the booth, then that door must have either an interlock controlling the exposure that will prevent the exposure if the door is not closed; or a warning light must be activated at the control panel when the door is opened.

6B.3.2 When the viewing system is a window, the following requirements also apply:

(1) The viewing area shall be at least 0.1 m2 (1 ft2).

(2) 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 0.5 m (1.5 ft) from the edge of the booth.

(3) The material constituting the window shall have at least the same lead equivalence as that required in the booth's wall in which it is mounted.

6B.3.3 When the viewing system is by mirrors, the mirror(s) shall be so located as to accomplish the general requirements of 6B.3.1.

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Autodesk Docs://224089 CMC Edwards Radiology/224089 - CMC Edwards Radiology - R22.rvt9/5/2024 5:16:12 PM

EDWARDS RADIOLOGY LAB

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Lead needs to extend at least 1 foot beyond edges of w all receptor.

1 ft 1 ft

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1/64” Lead

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Classroom Public Lounge

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RR(floor or other) RR(chest bucky)

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RR(all barriers) Side or Forw ard/Backscatter Sidescatter

Sidescatter Sidescatter

Sidescatter Forw ard/Backscatter Sidescatter

Sidescatter Forw ard/Backscatter Select Preshielding

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G rid/cassette only

G rid/cassette only

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N one

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Lead Thickness m m 0.11

0.05 0.39

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0.27 Concrete Thickness

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0.358 0.245

0.451 0.789

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*Existing structure N

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sufficient.

Inputs