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The time resolution of a radiography system for high-Z materials shall be at least 1 ns,hence the need of a time measurement system with a resolution of about 100 ps.In this paper,a Time Measurement Evaluation Board (TMEB) is developed to meet the need.It is based on the time-to-digital converter of ACAM TDC-GP2.Test results show an overall time resolution of 81 ps in detecting cosmic-rays with a plastic scintillator.