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Calibration coefficients of the ionization chamber dosimeters on the basis of dosimeter free air chamber. X‐axis of the graph effective energy (keV), y‐axis shows the calibration coefficient: (a) is Ramtec 1000D and N23344; (b) the Model 9015 and 10X5‐6M; (c) is a graph showing the calibration coefficient of AE1340C and C‐1340.
