Korpach Ed, Berg Rodney, Erhardt Lorne, Lebel Luke, Liu Chuanlei
*Health Canada, Radiation Protection Bureau, Ottawa, ON, Canada; †Defence Research and Development Canada, Ottawa Research Centre, Ottawa ON, Canada; ‡Canadian Nuclear Laboratories, Chalk River, ON, Canada; §Callan Technologies Limited, Ottawa, ON, Canada.
Health Phys. 2016 May;110(5):427-35. doi: 10.1097/HP.0000000000000497.
During the Full-Scale Radiological Dispersal Device Field Trials carried out in Suffield in 2012, several suites of detection and sampling equipment were used to measure and characterize the explosive dispersal of the short half-life radioactive tracer Lanthanum-140 ((140)La). The equipment deployed included networks of in situ real-time radiation monitoring detectors providing measurements of different sensitivities and characteristics. A dense array of lower sensitivity detectors was established near field, ranging from 10 to 450 m from the detonation location. A sparser array of more sensitive detectors was established in the far field (150 m to 3.5 km from the detonation location). Each was used to collect and report the dose rate data from the radioactive plume passage with a sample time resolution of 1 s. The two systems went through independent calibrations and were compared and shown to be consistent with each other. The in situ gamma radiation measurements have allowed the movement and evolution of the plume to be described and to identify deposition rates and non-uniformities in the temporal shape of the plume. This knowledge could be applied for emergency planning guidance for the case of release of radioactive material by a radiological dispersive device.
在2012年于萨菲尔德进行的全面放射性散布装置实地试验中，使用了几套检测和采样设备来测量和描述短半衰期放射性示踪剂镧-140（¹⁴⁰La）的爆炸散布情况。所部署的设备包括原位实时辐射监测探测器网络，可提供不同灵敏度和特性的测量结果。在近场（距爆炸位置10至450米）建立了密集的低灵敏度探测器阵列。在远场（距爆炸位置150米至3.5千米）建立了较为稀疏的高灵敏度探测器阵列。每个阵列都用于收集和报告放射性羽流通过时的剂量率数据，采样时间分辨率为1秒。这两个系统经过独立校准，并进行了比较，结果显示相互一致。原位伽马辐射测量使得能够描述羽流的移动和演变，并确定羽流时间形状中的沉积速率和不均匀性。这些知识可应用于放射性散布装置释放放射性物质情况下的应急规划指导。
