TABLE 2

Distance (cm)Conversion factor (cm−2)
ℓ = 20 cmℓ = 50 cmℓ = 70 cmℓ = 100 cmℓ = 174 cm
11.47E-016.12E-024.41E-023.10E-021.79E-02
52.21E-021.10E-028.17E-035.88E-033.48E-03
107.85E-034.76E-033.69E-032.75E-031.67E-03
153.92E-032.75E-032.22E-031.71E-031.07E-03
202.32E-031.79E-031.50E-031.19E-037.73E-04
251.52E-031.26E-031.09E-038.86E-045.94E-04
301.07E-039.26E-048.21E-046.87E-044.75E-04
357.95E-047.09E-046.41E-045.49E-043.90E-04
406.12E-045.59E-045.13E-044.48E-043.28E-04
454.86E-044.51E-044.20E-043.72E-042.79E-04
503.95E-043.71E-043.49E-043.14E-042.41E-04
553.27E-043.10E-042.94E-042.68E-042.10E-04
602.75E-042.63E-042.51E-042.32E-041.85E-04
652.35E-042.26E-042.17E-042.02E-041.64E-04
702.03E-041.96E-041.89E-041.77E-041.47E-04
751.77E-041.72E-041.66E-041.57E-041.32E-04
801.55E-041.51E-041.47E-041.40E-041.19E-04
851.38E-041.35E-041.31E-041.25E-041.08E-04
901.23E-041.20E-041.18E-041.13E-049.81E-05
951.10E-041.08E-041.06E-041.02E-048.97E-05
1009.97E-059.80E-059.62E-059.27E-058.23E-05
• Multiplication of these factors by appropriate exposure rate constant will result in dose rate per unit activity at that distance, uncorrected for patient attenuation and scatter.