CHAPTER II: ILLINOIS EMERGENCY MANAGEMENT AGENCY
SUBCHAPTER b: RADIATION PROTECTION
PART 360 USE OF X-RAYS IN THE HEALING ARTS INCLUDING MEDICAL, DENTAL, PODIATRY, AND VETERINARY MEDICINE
SECTION 360.TABLE B HALF-VALUE LAYER AS A FUNCTION OF TUBE POTENTIAL
Section 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 |
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Designed operating range |
Measured Operating Potential |
Specified Dental Systems2 |
Other X-Ray Systems3 |
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Below 50 |
30 |
1.5 |
0.3 |
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|
40 |
1.5 |
0.4 |
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49 |
1.5 |
0.5 |
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50 to 70 |
50 |
1.5 |
1.2 |
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60 |
1.5 |
1.3 |
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|
70 |
1.5 |
1.5 |
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Above 71 |
71 |
2.1 |
2.1 |
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|
80 |
2.3 |
2.3 |
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|
90 |
2.5 |
2.5 |
|
|
100 |
2.7 |
2.7 |
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|
110 |
3.0 |
3.0 |
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|
120 |
3.2 |
3.2 |
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|
130 |
3.5 |
3.5 |
|
|
140 |
3.8 |
3.8 |
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|
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)