Illinois Administrative Code
Title 32 - ENERGY
Part 360 - USE OF X-RAYS IN THE HEALING ARTS INCLUDING MEDICAL, DENTAL, PODIATRY, AND VETERINARY MEDICINE
Table B - Half-Value Layer as a Function of Tube Potential

Universal Citation: 32 IL Admin Code ยง B
Current through Register Vol. 47, No. 52, December 29, 2023

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.

Amended at 22 Ill. Reg. 5904, effective March 13, 1998

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