Radiation shielding information and guidance l.jpg
This presentation is the property of its rightful owner.
Sponsored Links
1 / 16

Radiation Shielding Information and Guidance PowerPoint PPT Presentation


  • 128 Views
  • Uploaded on
  • Presentation posted in: General

Radiation Shielding Information and Guidance. Don Parry, CHP District Health Physicist Michigan Department of Consumer & Industry Services Radiation Safety Section [email protected] Regulations and Standards Regarding Plan Reviews.

Download Presentation

Radiation Shielding Information and Guidance

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Radiation shielding information and guidance l.jpg

Radiation Shielding Information and Guidance

Don Parry, CHP

District Health Physicist

Michigan Department of Consumer & Industry Services

Radiation Safety Section

[email protected]


Regulations and standards regarding plan reviews l.jpg

Regulations and Standards Regarding Plan Reviews

  • Michigan’s first rules on ionizing radiation were published in February of 1958; Radiation shielding requirements were listed in an appendix based on NBS Handbook 76

  • Ionizing Radiation Rules were modified in 1965 and more clearly indicated that: Shielding shall be approved by the Michigan Department of Health

  • Rule 331(2) of the current Ionizing Radiation Rules (Promulgated in 1975) states that shielding is subject to design approval by the department

  • Plan reviews have been done routinely by the State Radiation Control Program since 1958

Radiation Safety Section


Radiation shielding information l.jpg

Radiation Shielding Information

  • Form BHS/HFS 852 – Information Required for a Radiation Shielding Plan Review

    • Available on Web site at:

      • www.michigan.gov/bhs (click on Mammography and X-ray Machines – Radiation Shielding Guidance)

  • Web Site includes guidance on shielding:

    • Radiographic or RF rooms

    • Mammography Rooms

    • Computed Tomography Rooms

    • Linear Accelerator Vaults

    • Additional Guidance

Radiation Safety Section


Radiation shielding information4 l.jpg

Radiation Shielding Information

  • Form BHS/HFS 852 – Information Required for a Radiation Shielding Plan Review

    • Be sure to include all requested information including:

      • Plans or blueprints of rooms and adjacent areas to scale with compass directions. (1/4” = 1 foot preferred)

      • Location of x-ray equipment, x-ray table,wall bucky, exposure switch, viewing window and control panel

      • Description of occupancy of adjoining areas including above or below

      • Description of floor and ceiling construction including minimum concrete thickness and density.

Radiation Safety Section


Radiation shielding information5 l.jpg

Radiation Shielding Information

  • Form BHS/HFS 852 (Continued)

    • Be sure to include all requested information including:

      • Location,type, thickness and height of proposed shielding

      • Indicate thickness and density of concrete and masonry materials

      • Limits of travel of table, tube and image receptor

      • Maximum kVp, mA and estimated workload in mAmin/wk

      • For CT scanners, include a copy of the iso-exposure curves normally provided by the manufacturer

      • Name and address of facility

      • Name and address to send response letter

Radiation Safety Section


Radiation shielding information6 l.jpg

Radiation Shielding Information

  • 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

Radiation Safety Section


Radiation shielding information7 l.jpg

Radiation Shielding Information

  • Certificate of Need

    • Equipment that requires a CON will not be registered until plans have been reviewed by the Radiation Safety Section.

Radiation Safety Section


Radiation shielding information8 l.jpg

Radiation Shielding Information

  • Shielding Guidance

    • Most medical x-ray rooms should normally be provided with 1/8 inch thick lead for primary barriers (including floors) and 1/16 inch thick lead for secondary barriers (including doors)

    • Vertical barriers must extend from the floor to a minimum height of 7 feet.

    • If it is necessary to add additional shielding to the ceiling of the room, then the shielding in the walls must be extended above the 7-foot height to overlap the ceiling shielding.

Radiation Safety Section


Radiation shielding information9 l.jpg

Radiation Shielding Information

  • Shielding Guidance

    • If there are multi story buildings in close proximity of the x-ray room, which have occupied spaces that could be exposed to scatter radiation that is not attenuated by the 7-foot high wall shielding, additional shielding may be necessary to protect those areas

    • Outside walls and, particularly, windows may require shielding to protect distant areas even if the nearest occupied area is not immediately adjacent

Radiation Safety Section


Radiation shielding information10 l.jpg

Radiation Shielding Information

  • 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)

Radiation Safety Section


Radiation shielding information11 l.jpg

Radiation Shielding Information

Examples

CT with adjacent Multi Story Building

May need additional shielding on outside wall

Occupied uncontrolled space in adjacent building

Adjacent Multi Story Building

Radiation Safety Section


Radiation shielding information12 l.jpg

Radiation Shielding Information

Floors

Need to use minimum thickness of concrete floor in shielding calculations

Need to know density of concrete (147 lbs/ft3 standard)

Radiation Safety Section


Radiation shielding information13 l.jpg

Radiation Shielding Information

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

Radiation Safety Section


Radiation shielding information14 l.jpg

Radiation Shielding Information

Examples

Exposure switch location

Switch needs to be arms length from

first scattered and leakage radiation

Switch Location

Adjacent Multi Story Building

Radiation Safety Section


Radiation shielding information15 l.jpg

Radiation Shielding Information

  • Summary

    • Submit shielding plans to the Radiation Safety Section for design approval prior to construction!

    • Include all information requested on form BHS/HFS 852.

    • Equipment that requires a Certificate of Need will not be registered until a plan is reviewed

    • Most rooms will be adequately shielded with 1/8 inch thick lead for primary barriers and 1/16 inch thick lead for secondary barriers.

    • Be sure to consider areas above and below the x-ray room when designing shielding.

Radiation Safety Section


Contact information l.jpg

Contact Information

Headquarters:Radiation Safety SectionMichigan Department of Consumer & Industry ServicesP.O. Box 30664Lansing, Michigan 48909 Phone: (517) 241-1989Fax: (517) 241-1981

Visitor/delivery address:5th Floor, G. Mennen Williams Building525 W. Ottawa StreetLansing, Michigan 48933

District Office:Our district office, formerly in Pontiac, has moved to: Radiation Safety SectionMichigan Department of Consumer & Industry Services38600 Van Dyke, Suite 375Sterling Heights, Michigan 48312

Phone: (586) 446-0200Fax: (586) 446-0227

Radiation Safety Section


  • Login