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Fig 4. A, The relative response of PLD to x-rays with different effective energy compared with an ionization chamber. PLD chips are irradiated on the tissue-equivalent phantom8 with (open circle) and without (black circle) a filter for energy compensation. B, Calibration factor converting the PLD readout value to the ESD as a function of the effective energy. All the PLD chips are irradiated without a filter for energy compensation.
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