Radiation Shielding Design

May 3, 2026

253.254.6988 | 3781 Rosedale St. Suite 102 Gig Harbor, WA 98335 | www.olympichp.com

Computed Tomography (A259)

Performed by

VA St. Louis Health Care System

915 N. Grand Blvd., St. Louis, MO 63013

Eric Hooper, MS, CHP, DABSNM

Medical Physicist

© 2026 | Olympic Health Physics, INC

Comments

E Control Wall Control None 1/16" Lead

E Control Door Control None 1/16" Lead / Wood Door

Please review the Methods & Assumptions as well as the Design & Building Requirements to ensure adequate barrier installation.

eric@olympichp.com

253.432.2806

Eric Hooper, MS, CHP, DABSNM

Medical Physicist

A

B1

C

B2

Room Door

North Wall

West Wall

West Wall

D East Wall Adjacent Control

D Storage Door

None 1/32" Lead

Adjacent Control None 1/32" Lead / Wood Door

Exterior (2nd Fl)

None

None 1/16" Lead

1/16" Lead None

114 mm Conc None

Hallway 1/32" Lead / Wood Door

Adjacent Control

CT (A256)

SHIELDING DESIGN SUMMARY

Facility Shielding Type

Room(s)

VA St. Louis Health Care System Computed Tomography

A259

Date May 3, 2026

915 N. Grand Blvd., St. Louis, MO 63013

Eric Hooper, MS, CHP, DABSNMPhysicist

Address

Barrier Description Adjacent Space

The following Shielding Design(s) were performed in accordance with NCRP 147, Structural Shielding Design for Medical X-Ray Imaging Facilities and applicable State regulations.

A

Minimum Shielding To Be Installed

South Wall Hallway 1/32" LeadNone

Existing Shielding

F Floor Exam / Recept. 114 mm Conc 1/32" Lead

G Ceiling Office 114 mm Conc 1/32" Lead mailto:eric@olympichp.com mailto:eric@olympichp.com mailto:eric@olympichp.com mailto:eric@olympichp.com mailto:eric@olympichp.com mailto:eric@olympichp.com mailto:eric@olympichp.com mailto:eric@olympichp.com mailto:eric@olympichp.com mailto:eric@olympichp.com mailto:eric@olympichp.com mailto:eric@olympichp.com mailto:eric@olympichp.com mailto:eric@olympichp.com mailto:eric@olympichp.com mailto:eric@olympichp.com mailto:eric@olympichp.com

CT Room A259

Radiation Shielding Design May 2026

Scatter Fraction K head

K body

NCRP 147, Table 4.1

Yes

Multi-Story, 2nd Floor

Occupancy Factors

Building Previously Shielded?

40%

Workload

Uncontrolled Areas

Design Goals Controlled Areas 0.1 mGy/week

Percentage Using Contrast

Appropriate fitting parameters were used to determine the required shielding for secondary barriers.

Methods & Assumptions

NCRP Report No. 147, Structural Shielding Design for Medical X-Ray Imaging Facilities

Primary Barriers

Secondary Barriers

Unit Make & Model Siemens Naeotom Alpha

References

Primary air kerma was not considered as the image receptor contains a primary barrier

Leakage and scatter were considered for all barriers.

0.02 mGy/week

No. of Head CT's per Week

No. of Body CT's per Week

Multi-Story?

Occupancy Above? Yes

Maximum kVp

NCRP 147, Table 5.2

9.00E-05

3.00E-04 cm -1 cm -1

Occupancy Below?

Yes

Dose Length Product mGy-cm mGy-cm

Head

Body

Radiation Shielding Design May 2026

The assumptions used in this report were supplied by the facility. If the actual CT usage is different than that provided by the facility or if there are increases to the workload or modifications made to the barriers, additional shielding may be required. In such cases, there should be consultation with a medical physicist. A copy of this report should be maintained by the facility for the life of this room.

Shielding is an integral part of rooms utilizing ionizing radiation and is required to protect staff, patients, and members of the public in adjacent spaces. The contents of this report should be reviewed carefully to ensure adjacent spaces are adequately protected.

Barrier penetrations, such as those for outlets, switches, light boxes, etc, should be wrapped or backed with equivalent shielding as specified for the prescribed wall. Special attention should be given to penetrations and joints as this is often a point of failure for shielded spaces.

Walls requiring lead will only need shielding installed on one side of the wall. For example, lead-lined drywall may be installed on one side of the studs while regular GWB may be installed on the other side.

All walls requiring shielding must have the shielding extend from the floor to a height of at least 7 feet.

Design & Building Requirements

Radiation Shielding Design May 2026

Shielding Calculations

1 Calculations were made to both the storage room and the control space beyond. The limiting calculations were due to the control room and are presented in the table above.

2 Calculations were made to occupied spaces above on the periphery of the scan room. Due to the increased distance, the vertical barriers only need to extend to a height of 7 feet.

1/16" Lead / Wood Door

E Control Wall Control 2.98 1.0 0.1 6.385 1.05 mm Lead None 1/16" Lead

E Control Door Control 3.91 1.0 0.1 3.709 0.87 mm Lead None

None

1/32" Lead

1/32" Lead / Wood Door

1/32" Lead

1/32" Lead

Minimum Shielding To Be Installed

None

A Room Door Hallway 5.64 0.125 0.02 0.52 mm Lead None

A South Wall Hallway 5.59 0.2 0.02 0.65 mm Lead0.363 1/32" Lead

Room Type Computed Tomography

Design Goal

(mGy/wk)

Minimum Barrier Thickness

Existing ShieldingBarrier Description Adjacent

Occupied Space Distance

(m) Occupancy

Factor

Total Weekly Air Kerma (mGy/wk)

40%

No. of Head CT's per Week

No. of Body CT's per Week

Percentage Using Contrast

Maximum kVp

Room Number A259

K 1 sec (Head) 1.51E-01

1/32" Lead / Wood Door

None 1/16" Lead

None

B2 West Wall CT (A256) 2.48 1.0 0.1 1.17 mm Lead 1/16" Lead

B1 West Wall Adjacent Control 2.48 1.0 0.1 1.17 mm Lead9.219

9.219

114 mm ConcG Ceiling2 Office 3.35 1.0 0.02

114 mm Conc

F Floor Exam / Recept. 3.35 1.0 0.02 114 mm Conc

C North Wall Exterior (2nd Fl) 4.45 0.025

0.1

0.02 30.03 mm Lead

None

D Storage Door1 Adjacent Control 6.6 1.0 1.302 0.56 mm Lead None

D East Wall1 Adjacent Control 6.6

K 1 sec (Body) 2.77E-01

Total Weekly Dose at 1m 56.7 mGy/wk

5.052 148.04 mm Conc.

5.052 148.04 mm Conc.

1.0 0.1 1.302 0.56 mm Lead

0.072

0.223

Radiation Shielding Design May 2026

CT Floor Map

Wall A

Wall C

1/32" Lead/Wood Door

Wall B2 No Additional

Shielding Required

Door A

1/32" Lead 1/16" Lead

1/32" Lead

No Additional

Shielding Required

Ceiling 1/32" Lead needs to be installed on the ceiling to protect occupied spaces above. See details on the next page.

Door D

1/32" Lead/Wood Door

Wall D

Floor 1/32" Lead needs to be installed on the floor to protect occupied spaces below. See details on the next page.

Control Door E

Control Wall &

Window E

1/16" Lead/Wood Door

Wall B1 1/16" Lead

Radiation Shielding Design May 2026

Side View

Wall A 1/32" Lead should be installed on Wall A.

The Lead should extend from the floor to a height of 7 feet.

Ceiling 1/32" Lead should be added to the existing 4.5" of Concrete to protect occupied spaces above. The lead should extend over the entirety of the room.

Any penetrations for electical, HVAC, etc should be wrapped and backed with equivalent lead. The lead may be installed above or below the concrete decking but should be installed in such a way as to prevent gaps, voids, or penetrations in the protective barrier.

Floor 1/32" Lead should be added to the existing 4.5" of Concrete to protect occupied spaces below. The lead should extend over the entirety of the room.

Any penetrations for electical, HVAC, etc should be wrapped and backed with equivalent lead. The lead may be installed above or below the concrete decking but should be installed in such a way as to prevent gaps, voids, or penetrations in the protective barrier.

Radiation Shielding Design May 2026

Surrounding Areas Floor Map

Radiation Shielding Design May 2026

Shielding Verification Surveys It is strongly recommended by NCRP Report. No. 147, and a requirement of many State Regulatory Agencies, that a Shielding Verification Survey be performed after the installation of protective barriers. These verification surveys evaluate the proper placement and thickness of prescribed barriers as well as inspects for any voids, gaps, or penetrations. For assistance with a Shielding Verification Survey, please each out to Olympic Health Physics.

3. The Viewing Window should allow for continuous viewing of the patient and be at least 1 sq. ft.

Supplemental Design and Building Information

Background The information provided in this section is designed to assist the facility, architect, and/or builder in successful installation of the required shielding for this space. This section is INFORMATIONAL ONLY and is to be used at the discretion of the facility. Olympic Health Physics makes no guarantees or warranties of any kind, express or implied, or assumes liability for the installation of protective barriers.

Regulatory Many states have regulations that govern the oversight of protective barriers to ensure barriers are adequate.

Regulations typically follow accepted published guidance documents, such as NCRP Report No. 147. In addition, some states have a formal review process that requires submittal of a Shielding Design by a Qualified Expert before construction. It is recommended to be familiar with the regulations specific to your State and installation to ensure the facility adheres to all relevant regulations.

Postings & Signage Radiation Area means any area, accessible to personnel, in which there exists radiation at such levels that a major portion of the body could receive in any 1 hour a dose in excess of 5 millirem. As such, it is recommended that this room be posted with a "Caution, Radiation Area" sign at each entrance. A lighted sign outside the room indicating when the beam is energized may also be installed, but is not required.

Control Booth There are several design elements that are specific to Operator Control Booth's.

1. The operator must be allotted at least 7.5 sq. ft. of unobstructed floor space in the Control Booth. No one dimension should be less than 2 feet.

2. The X-Ray Control Switch must be positioned and permanently mounted at least 40 inches from the outside edge of the Control Booth. The position of the X-Ray Control Switch should allow for continuous viewing of the patient during exposure.

Radiation Shielding Design May 2026

Barrier Installation

Walls Sheet lead should be affixed to or covered with wallboard, plywood, or other rigid material. Where the edges of two lead sheets meet, continuity shall be ensured at the joints by sufficiently overlapping the lead sheets not less than 1/2 inch. In cases where a butt joint is used, a batten of the same lead thickness as the wall may be used to ensure adequate coverage of the gap.

Lead should be affixed to the wall using steel nails or screws. The penetrations created by screws or nails need not be covered with lead discs or supplementary lead.

All walls requiring shielding must have the shielding extend from the floor to a height of at least 7 feet, unless otherwise stated.

Lead Schedule

The following Commercial Lead Schedule is provided to facilitate easy conversions between standard and metric units.

0.0

2.0

4.0

6.0

8.0

10.0

2.0 3.0 4.0 5.0 6.0 8.0 10.0 12.0 16.0 24.0

N om in a l T h ic kn es s of L ea d

(m m

Nominal Weight of Lead (lb foot-2)

Commercial Lead Schedule

1.58 mm 1/16 in.

1.98 mm 5/64 in.

2.38 mm 3/32 in.

3.17 mm 1/8 in.

0.79 mm 1/32 in.

1.19 mm 3/64 in.

3.96 mm 5/32 in.

4.75 mm 3/16 in.

6.33 mm 1/4 in.

9.5 mm 3/8 in.

Radiation Shielding Design May 2026

Doors for shielding applications are most commonly constructed of Wood or Steel. Wood is a poor attenuator of scatter radiation and is typically reserved only for low energy applications. The most commonly used shielded door is a Wood Door that has embedded with Lead. In some situations, a Steel Door may be substituted for a Wood/Lead Door, but requires a more thorough calculation to determine the appropriate Steel thickness.

Doors, door frames, and jambs shall maintain the same shielding integrity as specified for the barrier.

Junctions between door frames and adjoining walls should be constructed to create a 1 cm overlap between the frame and the wall. Care should be taken to ensure the jamb and wall has adequate overlap as this can be a common failure point found during Shielding Verification Surveys.

Doors should be installed so that the bottom edge comes as close as possible to the finished floor. There should be no more than a 1 cm gap between the bottom of the door and the finished floor. If the gap is greater than 1/2 inch, a shielded threshold should be installed.

If a Viewing Window is placed in a door, the window must have the same lead thickness equivalency as prescribed in the door.

Windows Windows and window frames shall maintain the same shielding integrity as specified for the barrier.

Junctions between window frames and adjoining walls should be constructed to create a 1 cm overlap between the frame and the wall. Care should be taken to ensure the frame and wall has adequate overlap as this can be a common failure point found during Shielding Verification Surveys.

As described in the Control Booth section above, any window located in the Control Booth should be at least 1 sq. foot and allow for continuous viewing of the patient during an exposure.

Penetrations All barrier penetrations such as those made for pipes, air ducts, conduits, electrical boxes, switches, etc., require the use of either lead baffles or lead backing with sufficient overlap in order to maintain the shielding integrity of the wall. The lead backing should be of at least the same thickness as prescribed for the wall in which the penetration is made.

Barrier penetrations can successfully be shielded using commercially available, pre-made, lead lined boxes.

Alternatively, sheet lead can be used to back and/or wrap barrier penetrations. Care should be taken to ensure adequate overlap of the penetration to maintain the barrier integrity.

Doors

Radiation Shielding Design May 2026

The following are example Shielding Details that may be referenced when installing protective barriers.

Example Shielding Details

Lead Shielding at Door Head/Jamb1

4 Lead Lined Plywood Wall3 Lead Lined Gypsum Wall

5 Lead Shielding at Elec. Box/Panel

Lead Shielding at Head, Jamb, & Sill2

Radiation Shielding Design May 2026

Medical Physicist Credentials

Eric Hooper, MS, CHP, DABSNM Current physics credentials including initial qualifications, continuing education, and continuing experience can be found on the Olympic Health Physics website at www.olympichp.com. A clickable link and/or the QR code below may also be used to access physics credentials directly.

Additional Services Stereotactic Biopsy Physics Evaluations

Gamma Camera Physics Evaluations

QR Code to Physics Credentials https://www.olympichp.com/current-credentials/

Equipment Calibration Certificates

Current calibration certificates for equipment used during this evaluation can be found on the Olympic Health Physics website at www.olympichp.com. A clickable link and/or the QR code below may also be used to access equipment calibration certificates directly.

QR Code to Equipment Calibration Certificates https://www.olympichp.com/calibration-certificates/

Mammography Physics Evaluations

Radiographic Physics Evaluations

Fluoroscopic Physics Evaluations

PET Physics Evaluations

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