Specifications

TABLE 5-4 HALF VALUE LAYERS AS A FUNCTION OF FILTRATION AND TUBE
POTENTIAL FOR DIAGNOSTIC UNITS*
Peak Potential (kVp)
Total
Filtration
mm Al
30 40 50 60 70 80 90 100 110 120
Typical Half-Value Layers (mm Al)
0.5 0.36† 0.47† 0.58 0.67 0.76 0.84 0.92 1.00 1.08 1.16
1.0 0.55 0.78 0.95 1.08 1.21 1.33 1.46 1.58 1.70 1.82
1.5 0.78 1.04 1.25† 1.42† 1.59† 1.75 1.90 2.08 2.25 2.42
2.0 0.92 1.22 1.49 1.70 1.90 2.10 2.28 2.48 2.70 2.90
2.5 1.02 1.38 1.69 1.95 2.16 2.37†‡ 2.58†‡ 2.82†‡ 3.06†‡ 3.30†‡
3.0 ... 1.49 1.87 2.16 2.40 2.62 2.86 3.12 3.38 3.65
3.5 ... 1.58 2.00 2.34 2.60 2.86 3.12 3.40 3.68 3.95
*For full-wave rectified potential
† Recommended minimum HVL for radiographic units.
‡ Recommended minimum HVL for fluoroscopes
ADDITIONAL FILTRATION (mm of Al) ADDITIONAL FILTRATION (mm of Al)
EXAMPLE A EXAMPLE B
FIGURE 5-6
HALF-VALUE LAYER DETERMINATION GRAPHS
November 2005 ( 5 - 8 ) Linear MC150-C Collimator