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Figure 2: Number of X-ray rooms and variation in output of X-ray machines (air kerma - free in air) (TDD = 150 cm, mean kVp = 58, mean mAs = 14)

Figure 2: Number of X-ray rooms and variation in output of X-ray machines (air kerma - free in air) (TDD = 150 cm, mean kVp = 58, mean mAs = 14)