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Illinois Administrative Code (Last Updated: March 27, 2024) |
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TITLE32. ENERGY |
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PART360. USE OF X-RAYS IN THE HEALING ARTS INCLUDING MEDICAL, DENTAL, PODIATRY, AND VETERINARY MEDICINE |
§360.TABLE B. Half-Value Layer as a Function of Tube Potential
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X-ray Tube Voltage (kilovolt peak)
Minimum HVL (mm of Al)1
Designed operating range
Measured Operating Potential
Specified Dental Systems2
Other X-Ray Systems3
Below 50
30
1.5
0.3
40
1.5
0.4
49
1.5
0.5
50 to 70
50
1.5
1.2
60
1.5
1.3
70
1.5
1.5
Above 71
71
2.1
2.1
80
2.3
2.3
90
2.5
2.5
100
2.7
2.7
110
3.0
3.0
120
3.2
3.2
130
3.5
3.5
140
3.8
3.8
150
4.1
4.1
1 Linear extrapolation or interpolation may be made for an x-ray tube potential (kVp) not listed in the table above (e.g., in the column entitled "Other X-ray Systems" operated at 20 kVp and 95 kVp, the minimum HVL required would be 0.2 and 2.6 millimeters of aluminum respectively).
2 "Specified Dental Systems" means any dental x-ray system designed for use with intraoral image receptors and manufactured after December 1, 1980.
3 "Other X-Ray Systems" means all x-ray systems required to meet the provisions of Sections 360.50, 360.60, 360.75, 360.90 (except "Specified Dental Systems") and 360.100 of this Part. Half-value layer requirements for mammography systems are specified in Section 360.71(e) of this Part.
(Source: Amended at 22 Ill. Reg. 5904, effective March 13, 1998)