32 Ill. Adm. Code 360.TABLE B
B Half-Value Layer as a Function of Tube Potential
Section 360
Section 360.TABLE B
Half-Value Layer as a Function of Tube Potential
X-ray Tube Voltage (kilovolt peak)
Minimum
HVL (mm of Al)
1
Designed
operating range
Measured
Operating Potential
Specified
Dental Systems
2
Other
X-Ray Systems
3
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.