Research on the Detection Capacity of UAV-borne CeBr3 Monitoring System with Infinite Surface Source
In case of a severe nuclear accident,it is critical to quickly obtain the radiation level in the accident emergency area for follow-up emergency decision-making and rescue,and to protect the public from radiation hazards.Airborne radiometric survey is one of the important technical means and methods to quickly obtain radiation levels in the early stage of nuclear emergency.Therefore,a UAV-borne CeBr3 monitoring system was designed and developed by Airborne Survey and Remote Sensing Center of Nuclear Industry.In order to evaluating the detection capability of the system,a Monte Carlo model was constructed and verified by a 60Co radioactive source.After that,the combination of full spectrum analysis,Monte Carlo and test were used to obtain the unit energy spectra of the monitoring system for natural occurring nuclide,and the detection efficiency and minimum detectable activity of the monitoring system against 137Cs infinity planner source were calculated and obtained under different monitoring conditions(natural radiation background,crystal number and measurement height)when the ground was subjected to a new 137Cs radioactive deposition.By simulating and calculating the unit energy spectra of natural radiation background and artificial radionuclide in nuclear emergency,the detection capacity of the self-developed UAV-borne CeBr3 monitoring system was accurately evaluated,which provided an important theoretical basis and data support for the subsequent use of the monitoring system to carry out airborne monitoring in nuclear emergency preparedness.
minimal detectable activityCeBr3 detectorairborne monitoring system for nuclear emergencyfull energy spectrum analysisMonte Carlo
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