便携式γ射线实时成像检测系统对露天农作物的放射性应急监测  

The radioactive emergency monitoring of crops in the open air by portable gamma-ray real-time imaging system

作　　者：张庆[1] 李文红[1] 张京[1] 周强[1] 拓飞[1] 徐翠华[1] 

机构地区：[1]中国疾病预防控制中心辐射防护与核安全医学所辐射防护与核应急中国疾病预防控制中心重点实验室,北京100088

出　　处：《中国医学装备》2015年第5期55-58,共4页China Medical Equipment

基　　金：国家科技支撑计划(2013BAK03B05)"核事故健康风险评估与卫生应急处置技术研究"

摘　　要：目的:探讨便携式γ射线实时成像检测系统监测露天农作物放射性污染的可行性,建立核事故向周围环境释放大量放射性核素时,随着大气运动、降水和自身重力等因素而降落到地面污染露天农作物的监测方法。方法:从便携式γ射线实时成像检测系统组成和工作原理出发,拓展其性能和功能,并利用国家二级标准实验室γ-刻度计检验其成像功能和剂量率测量值的准确性。结果:使用γ-刻度计中137Cs和60Co点源来检验便携式γ射线实时成像检测系统,所得成像清晰,能准确划分放射性污染范围,剂量率测量值最小相对偏差<3%,最大相对偏差为30.6%。结论:便携式γ射线实时成像检测系统能够划分放射性污染范围,较为准确的剂量率定值,因此可应用于核事故情况下露天农作物的放射性应急监测。Objective：To quickly monitor radioactive contamination of open crops. It is necessary to study the feasibility of monitoring radioactive contamination of open crops by gamma-ray real-time imaging system. Methods：To introduce the composition and working principle of portable gamma-ray real-time imaging system, and to expand its performance and functionality, and to test its imaging capabilities and dose rate measurement accuracy by using theγ-calibration gauge of national secondary standard laboratory. Results：The results of testing portable gamma-ray real-time imaging system by ^137Cs and ^60Co point source of γ-calibration gauge show clear image and distinguish the bound of radioactive pollution Accurately, and the dose rate measured at the minimum relative deviation of less than 3%, maximum relative deviation of 30.6%. Conclusion：Portable gamma-ray real-time imaging system can distinguish the bound of radioactive pollution accurately and measure dose rate accurately. So it can be well applied to the monitoring of open crops in nuclear accident.

关 键 词：便携式γ实时成像 农作物 放射性 应急监测 

分 类 号：R144[医药卫生—公共卫生与预防医学]