Research On Vehicle Gamma Spectrum Measurement System Based On GIS

The Fukushima nuclear accident in Japan warned that people should always pay attention to nuclear safety issues.Emergency monitoring of nuclear accidents is an important way to ensure nuclear safety.The vehicle gamma spectrum measurement system can complete the daily environmental radiation monitoring.When a nuclear accident occurs,the system can also get to the scene quickly and carry out environmental radioactivity measurement for the designated position.At present,researches on vehicle gamma spectrum measurement system have been carried out in domestic and foreign.A 0.4L(3×3 inch)NaI(Tl)detector has been developed as the main detection unit of the vehicle gamma spectrum measurement system.The sensitivity can reach 10nGy/h-80uGy/h.Multiple groups of 4L large detectors as the main detection unit are been generally used in domestic.In this paper,we use two 0.4L NaI(Tl)detectors and the lab independently developed digital multichannel to build a set of vehicle borne gamma spectrum measurement hardware system.The software of gamma ray spectrum measurement system based on GIS is developed.It can monitor the position of vehicle in real time,calculate the absorbed dose rate,display the track of monitoring,and mark the anomalous path of radiation.1.Based on Baidu map API and WebGIS,a gamma ray spectrum measurement system with GIS function has been developed.This system can complete map display,patrol vehicle location,radioactive abnormal point marking,and monitoring area information inquiry and so on.2.A software module for vehicle gamma ray spectrum measurement is developed,which mainly includes data acquisition,spectrum display,peak finding,nuclide recognition,energy scale,efficiency scale,calculation of absorbed dose rate in air,database,data query and so on.3.The system static response test and dynamic response test were carried out.The test shows that the system can be used for radiation environment monitoring.