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Radiation Shielding Update and Guidance

Radiation Shielding Update and Guidance. Don Parry, MHP, CHP Region I Physicist Michigan Department of Community Health Radiation Safety Section dparry@michigan.gov www.michigan.gov/rss. Regulations Regarding Radiation Shielding Plan Reviews.

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Radiation Shielding Update and Guidance

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  1. Radiation Shielding Update and Guidance Don Parry, MHP, CHP Region I Physicist Michigan Department of Community Health Radiation Safety Section dparry@michigan.gov www.michigan.gov/rss

  2. 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.

  3. New Standards Regarding Shielding Design

  4. 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

  5. Radiation Shielding Update and Guidance Recent changes in Form BHS/HFS 852 – Requests CON number if available

  6. Radiation Shielding Update and Guidance Recent changes in Form BHS/HFS 852 – Includes check boxes for required items

  7. 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.

  8. 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

  9. 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.

  10. Radiation Shielding Update and Guidance

  11. 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)

  12. 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

  13. 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)

  14. 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

  15. 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

  16. 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.

  17. Contact Information Headquarters: Radiation Safety SectionMichigan Department of Community HealthP.O. Box 30664Lansing, Michigan 48909 Phone: (517) 241-1989Fax: (517) 241-1981 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: (586) 446-0200Fax: (586) 446-0227

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