Table 5 Uncertainty Analysis
I. Uncertainty in Determining Dose from NOD | ||||
Low Dose | High Dose | |||
Uncertainty Description | Type A (%) | Type B (%) | Type A (%) | Type B (%) |
Scanning Consistency | 0.1 | 0.1 | ||
Film uniformity | 1.0 | 1.0 | ||
ROI Size | 1.5 | 1.5 | ||
Calibration Curve Fit | 4.8* | 0.8* | ||
Combined Uncertainty | 0.1 | 5.1 | 0.1 | 2.0 |
Total Uncertainty | 5.1 | 2.0 | ||
II. Uncertainty in Film Exposure | ||||
Low Dose | High Dose | |||
Uncertainty Description | Type A (%) | Type B (%) | Type A (%) | Type B (%) |
Repeatability | 0.1 | 0.10 | ||
Distance to Source | 4.0 | 4.0 | ||
Lack of Scatter Equilibrium | 5.0 | 5.0 | ||
Source Strength | 1.5 | 1.5 | ||
Exposure Time | 0.8* | 0.1* | ||
Combined Uncertainty | 0.1 | 6.6 | 0.10 | 6.6 |
6.6 | 6.6 | |||
III. Total Uncertainty | 8.4 | 6.9 | ||