The typical 60 Co irradiation room of hanging chain conveyor has been taken as a research subject. Ignition temperatures of common radiation cargo were measured through the experiment method, minimum ignition temperature is 210 °C. To get the temperature variation and temperature field under stuck radioactive sources, a fire scenario was presented and simulated by FDS. The results show that temperatures rise faster when stuck radioactive source broke out within an hour. As the growth of the

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... , the temperature has been on the rise, but slowly. The stuck radioactive source occurred after 11.9 days later, local temperatures can reach 210 °C, radiation cargo may be ignited..