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An investigation using Monte Carlo simulation on a minitype reference radiation (MRR) for the calibration of gamma personal dosimeters is reported. The distribu-tions of dose rate and scattering gamma spectrum are the main simulation objects with the variable physical struc-tures of MRR and the dosimeters as parameters that are to be calibrated. Further, the influences on the reference radiation caused by these parameters are analyzed in detail. This work provides a theoretical basis for better under-standing of MRR used for calibration of gamma personal dosimeters. This analysis can help in the development of a calibration technology for such tools based on MRR.