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Study on Irradiation Sterilization and Dose of Vannamei Mixted Feed MASS ATTENUATION COEFFICIENTS, MASS ENERGY-ABSORPTION COEFFICIENTS AND ABSORBED DOSE CHANGE COEFFICIENTS OF CROP SEEDS MEASUREMENT AND COMPUTED SIMULATION OF DOSE DISTRIBUTION IN IRRADIATED CHINESE MEDICINE IRRADIATION PARAMETERS FOR THE CONTROL OF MICROORGANISMS IN DRIED PET FOODS NORMATIVE MANAGEMENT ON CHINESE COMPREHENSIVE IRRADIATION FACILITY(γ facility)