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目的通过对辐照装置内代表性装源活度和代表性辐照样品进行火灾模拟计算,得出自卡源事故起到开始着火时间,为发生卡源事故后的应急处理提供时间上的参考。方法使用火灾动态模拟(FDS)技术对具典型代表意义1.11E+13 Bq(悬挂链式),7.40E+12 Bq(悬挂链式),3.70E+12Bq(悬挂链式),1.85E+12 Bq(堆码式)的辐照室在卡源故障情况下室内存在代表性的易燃辐照物品(瓦楞纸、辣椒面、卫生纸、纱布)时温度场分布进行了理论计算和FDS数值模拟。结果通过计算得出了不同活度和不同辐照物品情况下的自事故发生到开始着火的时间。结论通过计算分析,辐照装置发生卡源事故后如处理不当,辐照物品会着火危机放射源安全从而使事故扩大,因此必须引起重视。
OBJECTIVE Through fire simulations of typical representative source activity and representative irradiated samples in irradiation equipment, the author finds that the time from the onset of the card-source accident to the start of the fire period provides a reference for the emergency treatment after the occurrence of a card-source accident. The method uses fire dynamic simulation (FDS) techniques to characterize typical representative 1.11E + 13 Bq, 7.40E + 12 Bq, 3.70E + 12Bq, 1.85E + 12 The temperature field distribution of Bq (stacking code) irradiation room under the condition of card source failure is representatively combustible irradiated articles (corrugated paper, paprika, toilet paper, gauze) and theoretical calculation and FDS numerical simulation. The results obtained by calculating the time of occurrence of an accident from the time of the accident to the start of the fire with different activity and different irradiated articles. Conclusions Through calculation and analysis, improper handling of the irradiation device after the occurrence of a card-source accident results in the accidental exposure of radiation sources to the safety of the radiation source and therefore needs to be taken seriously.