Table B - Half-Value Layer as a Function of Tube Potential

Current through Register Vol. 46, No. 15, April 8, 2022

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.

Notes

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

The following state regulations pages link to this page.



State regulations are updated quarterly; we currently have two versions available. Below is a comparison between our most recent version and the prior quarterly release. More comparison features will be added as we have more versions to compare.