The Development Of Regional Environmental Gamma Radiation Dose Monitoring System

With the development of Chinese nuclear technology, energy structure transformation and nuclear power project to restart, the use of nuclear energy will be in the fields of military, industry, agriculture, scientific research, medical and health development have a strong impetus. However, in nuclear technology to the people bring huge benefits at the same time, the safety of our life brings potential hazards. When a nuclear accident occurs, radioactive nuclide high-energy gamma ray fast in the air diffusion, not only directly cause harm to human body, but also indirectly to human survival environment cause pollution. Therefore, in order to effectively prevent the hazards of radioactive substances, protect people’s life safety, developed a can quickly and accurately measuring the radiation dose rate instrument is very necessary.The design on regional environmental gamma radiation dose rate monitoring based on Na I(TI) detector energy response and monitoring node- host communication mode was studied, developed a regional environmental gamma radiation dose rate monitoring system. The system can real-time remote monitoring set within the area of air gamma radiation dose, and the various exceptions do real-time early warning, to nearby personnel evacuation door, and for a time. The main research contents and results are as follows:1) The design of hardware system of regional environmental monitoring rate of gamma ray doseDesign stability of SPI data receiving circuit, can bus data transmission circuit, STM32 control circuit, Ethernet interface circuit hardware circuit, developed reliable STM32 hardware program, study the LWIP protocol transplantation without system to achieve a spectral data acquisition, processing and communication data transmission. According to environmental monitoring and field conditions, the integration of design, improve the anti-interference ability and reliability of the instrument.2) Rate monitor software design of regional environmental gamma radiation doseMainly carry out the research work on gamma energy spectrum dose conversion rate of, completed on dose rate conversion function and detector energy response function of solving with MATLAB software simulation and Monte Carlo simulation, and verify the energy spectrum transfer function to monitor the feasibility of environmental gamma radiation dose by comparative method.3) Test and applied of the systemAfter the completion of the development of the system, the hardware circuit was tested. The test shows that the normal function of hardware circuit. After the instrument stability, security, reliability and other various performance indicators carried out experimental test, the results show that the instrument can be stable and reliable for environmental gamma dose of real-time continuous monitoring, and various technical indicators have reached the predetermined design target.