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- TABLE 1
Ratios of Line-Source Values to Point-Source Values as Function of Line-Source Length and Distance
Distance (cm) Ratio ℓ = 20 cm ℓ = 50 cm ℓ = 70 cm ℓ = 100 cm ℓ = 174 cm 1 0.147 0.061 0.044 0.031 0.018 5 0.554 0.275 0.204 0.147 0.087 10 0.785 0.476 0.369 0.275 0.167 15 0.882 0.618 0.500 0.384 0.241 20 0.927 0.717 0.601 0.476 0.309 25 0.951 0.785 0.679 0.554 0.371 30 0.965 0.834 0.739 0.618 0.427 35 0.974 0.868 0.785 0.672 0.478 40 0.980 0.894 0.822 0.717 0.524 45 0.984 0.913 0.850 0.754 0.566 50 0.987 0.927 0.872 0.785 0.603 55 0.989 0.939 0.891 0.812 0.637 60 0.991 0.947 0.905 0.834 0.667 65 0.992 0.955 0.917 0.852 0.694 70 0.993 0.960 0.927 0.868 0.719 75 0.994 0.965 0.936 0.882 0.741 80 0.995 0.969 0.943 0.894 0.761 85 0.995 0.973 0.949 0.904 0.779 90 0.996 0.975 0.954 0.913 0.795 95 0.996 0.978 0.958 0.921 0.810 100 0.997 0.980 0.962 0.927 0.823 Distance (cm) Conversion factor (cm−2) ℓ = 20 cm ℓ = 50 cm ℓ = 70 cm ℓ = 100 cm ℓ = 174 cm 1 1.47E-01 6.12E-02 4.41E-02 3.10E-02 1.79E-02 5 2.21E-02 1.10E-02 8.17E-03 5.88E-03 3.48E-03 10 7.85E-03 4.76E-03 3.69E-03 2.75E-03 1.67E-03 15 3.92E-03 2.75E-03 2.22E-03 1.71E-03 1.07E-03 20 2.32E-03 1.79E-03 1.50E-03 1.19E-03 7.73E-04 25 1.52E-03 1.26E-03 1.09E-03 8.86E-04 5.94E-04 30 1.07E-03 9.26E-04 8.21E-04 6.87E-04 4.75E-04 35 7.95E-04 7.09E-04 6.41E-04 5.49E-04 3.90E-04 40 6.12E-04 5.59E-04 5.13E-04 4.48E-04 3.28E-04 45 4.86E-04 4.51E-04 4.20E-04 3.72E-04 2.79E-04 50 3.95E-04 3.71E-04 3.49E-04 3.14E-04 2.41E-04 55 3.27E-04 3.10E-04 2.94E-04 2.68E-04 2.10E-04 60 2.75E-04 2.63E-04 2.51E-04 2.32E-04 1.85E-04 65 2.35E-04 2.26E-04 2.17E-04 2.02E-04 1.64E-04 70 2.03E-04 1.96E-04 1.89E-04 1.77E-04 1.47E-04 75 1.77E-04 1.72E-04 1.66E-04 1.57E-04 1.32E-04 80 1.55E-04 1.51E-04 1.47E-04 1.40E-04 1.19E-04 85 1.38E-04 1.35E-04 1.31E-04 1.25E-04 1.08E-04 90 1.23E-04 1.20E-04 1.18E-04 1.13E-04 9.81E-05 95 1.10E-04 1.08E-04 1.06E-04 1.02E-04 8.97E-05 100 9.97E-05 9.80E-05 9.62E-05 9.27E-05 8.23E-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.
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