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Michigan Administrative Code (Last Updated: November 16, 2016) |
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Department LR. Licensing and Regulatory Affairs |
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MIOSHA |
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Chapter Ionizing Radiation Rules Part 1 to Part 15 |
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Part 7. MEDICAL X-RAY INSTALLATIONS |
Section 325.5357. Appendix A. Table 1.
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Rule 357. Recommended shielding for medical diagnostic x-ray installations.*
HIGH WORKLOAD HOSPITALS RADIOLOGY OFFICES
MODERATE WORKLOAD CLINICS
LOW WORKLOAD OFFICES
Anticipated Workload
250-1000 mA-min/wk
15-250 mA-min/wk
0-15 mA-min/wk
Thickness of shielding material or equivalent protection
Lead† Concrete††
(inches) (inches)
Lead† Concrete††
(inches) (inches)
Concrete†† Lead† (inches) (inches)
OPERATOR SHIELDS PRIMARY BEAMS
Walls Doors Floors
SECONDARY RADIATION
Walls Doors Floors Ceilings
1/16 - 1/8
1/16 - 1/8
1/16 - 1/8
3/32 - 1/8
1/16
1/16
1/16
1/16
5 - 9
5 - 9
- - -
6 ½ - 9
5
5
5
2.5
1/16
1/16
1/16
1/16 - 3/32
1/32 - 1/16
1/32 - 1/16
1/32 - 1/16
1/32
5
5
- - -
5 - 6 ½
2 ½ - 5
- - -
2 ½ - 5
2 ½
1/16
1/16
1/16
1/16
0 - 1/32
0 - 1/32
0 - 1/32
0 - 1/32
5
5
- - - 5
0 - 2 ½
0 - 2 ½
0 - 2 ½
0 - 2 ½
* This table is provided only as a guideline for optimum shielding protection for a few typical radiographic workloads and conditions encountered in hospital, clinic and office situations. More or less shielding may be required in any specific case depending upon many variable factors. Shielding listed is that generally approved by the division of radiological health.
† Thickness ranging from 1/32-1/8 inch based on commercial lead sheets ranging from 2-8 pounds per square foot nominal weight.
†† Thickness based on concrete density of 2.35 grams per cubic centimeter (147 pounds per cubic foot).
[Note: As a result of Executive Order 2011-4, the authority, powers, duties, functions, and responsibilities of the radiation machine registration, licensing, and compliance program were transferred to the Michigan Department of Licensing and Regulatory Affairs. The reference in these rules to the Division of Radiological Health should now reference the Radiation Safety Section.]
History: 1954 ACS 85, Eff. Dec. 3, 1975.