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A, On this unused badge, all 6 circles are visible with good contrast with the background. B, This badge was used during 1 patient's hospitalization to measure dose. Note that the upper left circle matches the background along the left edge. The upper middle circle is visible. The visibility indicates that the measure of skin radiation dose at this point of hospitalization is more than 0.5 Gy but less than 1.0 Gy.
