Code of Colorado Regulations
1000 - Department of Public Health and Environment
1007 - Hazardous Materials and Waste Management Division
6 CCR 1007-1 - RULES AND REGULATIONS PERTAINING TO THE ADMINISTRATION AND ENFORCEMENT OF THE PESTICIDE APPLICATORS' ACT
Part 06 - RADIATION CONTROL - X-RAY IMAGING IN THE HEALING ARTS
Appendix 6 CCR 1007-1-6-I - TABLE OF HALF VALUE LAYERS FOR A SPECIFIED kVp AND SYSTEM

Current through Register Vol. 48, No. 6, March 25, 2025

X-Ray Tube Voltage (kilovolt peak)

Design

Operating

Range

Measured Operating Potential

Minimum HVL (mm in Aluminum)

Specified Dental Systems \1\

Other X-Ray Systems \2\

Other X-Ray Systems \3\

Below 51

30

1.5

0.3

0.3

40

1.5

0.4

0.4

50

1.5

0.5

0.5

51 to 70

51

1.5

1.2

1.3

60

1.5

1.3

1.5

70

1.5

1.5

1.8

Above 70

71

2.1

2.1

2.5

80

2.3

2.3

2.9

90

2.5

2.5

3.2

100

2.7

2.7

3.6

110

3.0

3.0

3.9

120

3.2

3.2

4.3

130

3.5

3.5

4.7

140

3.8

3.8

5.0

150

4.1

4.1

5.4

\1\ Dental x-ray systems designed for use with intraoral image receptors and manufactured after December 1, 1980.

\2\ Dental x-ray systems designed for use with intraoral image receptors and manufactured before or on December 1, 1980, and all other x-ray systems subject to this section and manufactured before June 10, 2006.

\3\ All x-ray systems, except dental x-ray systems designed for use with intraoral image receptors, subject to this section and manufactured on or after June 10, 2006.

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