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In response to requests from the sites of radiation emergency medicine, we developed a prototype of a computer system for assessing radioactive contaminants remaining in a wound or on the skin surface. This system implements numerical calibration of detectors measuring the contamination using a Monte Carlo simulation-based radiation transport code (MCNPX), coupled to a numerical phantom modeling the contaminants and the surrounding tissue. With the help of functional graphical user interfaces (GUIs) provided by the system, a user can perform desired simulations without complicated procedures to prepare input files for MCNPX. Benchmark calculations of MCNPX were conducted to verify the simulations and adjust detection-related parameter values not sufficiently provided by suppliers. The developed system should aid in making better assessments of the radiological contamination.