Radiation Shielding Update and Guidance

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Radiation Shielding Update and Guidance

• Don Parry, MHP, CHP
• Region I Physicist
• Michigan Department of Community Health
• Radiation Safety Section
• dparry_at_michigan.gov
• www.michigan.gov/rss

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Regulations Regarding Radiation Shielding Plan
Reviews

• Rule 331(2) of the current Ionizing Radiation
  Rules (Promulgated in 1975) states that shielding
  is subject to design approval by the department
• Proposed new rule states that prior to
  construction, the floor plans, shielding
  specifications and equipment arrangement of new
  installations, or modifications of existing
  installations, utilizing ionizing radiation
  machines shall be submitted to the department for
  review and approval.

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New Standards Regarding Shielding Design
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Radiation Shielding Update and Guidance

• Form BHS/HFS 852 Information Required for a
  Radiation Shielding Plan Review
• Available at www.michigan.gov/rss
• Web Site includes guidance on shielding
• Radiographic or RF rooms
• Mammography Rooms
• Computed Tomography Rooms
• Linear Accelerator Vaults
• Additional Guidance

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Radiation Shielding Update and Guidance

• Recent changes in Form BHS/HFS 852 Requests CON
  number if available

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Radiation Shielding Update and Guidance

• Recent changes in Form BHS/HFS 852
• Includes check boxes for required items

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Radiation Shielding Update and Guidance

• Form BHS/HFS 852 Information Required for a
  Radiation Shielding Plan Review
• Be sure to include all requested information
  including
• Description of occupancy of adjoining areas
  including above or below
• Description of floor and ceiling construction
  including minimum concrete thickness and density.

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Radiation Shielding Update and Guidance

• Plan Reviews
• Plans should be submitted prior to construction!
• Construction of an x-ray room without an approved
  plan may cause shielding modifications to be done
  after the room is constructed

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Radiation Shielding Update and Guidance

• Certificate of Need
• Equipment that requires a CON will not be
  registered until plans have been reviewed by the
  Radiation Safety Section.
• This includes mobile CT scanners used while fixed
  units are being installed
• Mobile scanners need to submit a site plan
  showing the location of the scanner.

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Radiation Shielding Update and Guidance
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Radiation Shielding Update and Guidance

• Examples
• No Occupancy above or below
• On Slab
• Shielding should be floor to 7
• 1/16 inch thick secondary, 1/8 inch thick primary

1/8 inch lead (blue)
Leakage
Scatter
1/16 inch lead (red)
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Radiation Shielding Update and Guidance

• Examples
• CT with adjacent Multi Story Building
• May need additional shielding on outside wall

Occupied uncontrolled space in adjacent building
Adjacent Multi Story Building
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Radiation Shielding Update and Guidance

• Floors
• Need to use minimum thickness of concrete floor
  in shielding calculations
• Need to know density of concrete (147 lbs/ft3
  standard)

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Radiation Shielding Update and Guidance

• Examples
• Occupied space below
• Need 1/16 inch thick lead on floor with 1/8 thick
  lead under table
• Floor shielding should overlap wall shielding

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Radiation Shielding Update and Guidance

• Examples
• Exposure switch location

Switch needs to be arms length from first
scattered and leakage radiation
Switch Location
Adjacent Multi Story Building
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Radiation Shielding Update and Guidance

• Summary
• Submit shielding plans to the Radiation Safety
  Section for design approval prior to
  construction!
• Include all information requested on form BHS/HFS
  852 including CON number if applicable.
• Equipment that requires a Certificate of Need,
  including mobile CT scanners, will not be
  registered until a plan is reviewed
• Be sure to consider areas above and below the
  x-ray room when designing shielding.

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Contact Information

• Headquarters
• Radiation Safety SectionMichigan Department of
  Community HealthP.O. Box 30664Lansing, Michigan
  48909
• Phone [phone]Fax [phone]
• Visitor/delivery address
• 1st Floor, Ottawa Building611 W. Ottawa
  StreetLansing, Michigan 48933
• District Office
• Radiation Safety SectionMichigan Department of
  Community Health38600 Van Dyke, Suite
  375Sterling Heights, Michigan 48312
• Phone [phone]Fax [phone]