Abstract: Radiation sources have strong social sensitivity. Whether they are discarded or leaked, they will cause inestimable loss and harm to human society and the environment. In order to enable it to further benefit human society and regulate the use of radiation sources, safety supervision is particularly important. The article introduces a set of security supervision IoT application system integrating radiation source dose monitoring, RFID electronic tags, GPS earth positioning, displacement detection, video monitoring and management, in order to reduce the risk of radiation source theft and achieve accurate and efficient radiation The goal of source safety supervision.
Keywords: Internet of Things; radiation source; RFID; GPS; GPRS; video surveillance
introduction
With the rapid development of nuclear technology and information technology, the application market of radiation sources is becoming increasingly widespread. Through applications in industry, agriculture, medicine, and research, radiation sources have provided tremendous benefits for humans and society, and have made important contributions to scientific and technological progress. At the same time, due to poor management of radiation sources, it has caused serious harm to the environment and human health. The traditional supervision methods of radiation sources are locking, warning and artificial care, but accidents caused by human factors abound, and they pose a huge threat to the safety of society and the public. Therefore, it is of great practical significance to establish a set of radiation source safety supervision system based on the Internet of Things, connect the radiation source and the network for information exchange and communication, and realize the goals of intelligent identification, positioning, tracking, monitoring and management.
1 Overall system architecture
The overall architecture of the radiation source safety supervision system based on the Internet of Things is composed of the front-end field part (perception layer), data transmission part (transmission layer), and safety supervision part (application layer). Figure 1 shows the system structure diagram. Among them, the front-end site part sets devices such as dose detection, RFID electronic tag recognition, GPS positioning tracking, video monitoring and other devices on the premise of the radiation source to ensure that the radiation source has abnormal conditions such as loss, displacement and leakage. Data and status signals and send alarm signals to local local and supervisory personnel. The data transmission part transmits the dose information and electronic label information to the monitoring center through GPRS; the video monitoring signal is transmitted to the monitoring center through 3G, ADSL or dedicated lines; the mobile source position information is transmitted to the monitoring center through GPS positioning and GPRS ; Transmit mobile source video surveillance images to the monitoring center in the form of pictures via GPRS. The security supervision system of the monitoring center completes the analysis and processing of information, intelligent application services and control decisions.
2 Design of field front-end perception layer
The on-site front-end perception layer is mainly composed of hardware devices such as dose detectors, anti-demolition RFID tags, RFID readers, displacement monitoring equipment, high-definition network cameras and network equipment.
2.1 Dose detection
Use different types of measuring instruments to measure the radiation intensity of each radiation source application site. Each monitor collects the measurement data of the measured radiation source through a photoelectric sensor, and after A / D conversion, the meter transmits the obtained digital signal to the monitoring center through a wireless network. The monitoring center can judge whether the radiation source has lost or the dose has leaked out.
2.2 RFID electronic tags and readers
Radio frequency identification RFID (RadioFrequencyIdenTIficaTIon) technology is an emerging automatic identification technology and the core technology of the Internet of Things. It uses wireless radio frequency for non-contact two-way data communication to achieve the purpose of target identification and data exchange. RFID has the characteristics of long distance, simultaneous identification of multiple tags, fast recognition speed, large tag storage capacity, and data security. In this solution, the use of RFID technology to achieve radiation source anti-theft alarm, the principle shown in Figure 2.
If you install an anti-demolition RFID tag with an effective distance of less than 10m for each radiation source, and install an RFID reader not far from the radiation source (such as less than 10m), then the RFID reader will continuously read the data from the RFID . Once the RFID tag is dismantled, or the radiation source is moved more than 10m away from the RFID reader, the RFID reader will no longer be able to read the RFID data. At this time, it is considered that the radioactive source has been illegally moved, and the alarm will automatically send SMS Way to send alarm information to a specific number of mobile phones, at the same time, send alarm information to the monitoring center through GPRS or CDMA or 3G network.
2.3 GPS (GlobalPosiTIoningSystem) global positioning system
The terminal equipment is composed of a GPS receiver and a GPRS transceiver module. The GPS module is responsible for receiving satellite positioning (longitude, latitude, and altitude) signals, and the GPRS module is responsible for wireless transmission of information. When the mobile radiation source is in use or transportation, in order to achieve reliable remote monitoring of the radiation source by the GPS terminal, GPS combines the GIS (GeographicalInformaTIonSystem) geographic information system to track the position of the radiation source in real time. When the GPS is not working properly, it is passed The GIS system marks the alarm information on the corresponding map.
2.4 Displacement monitoring
When there is an illegal displacement of the radiation source package and the installation location, the system will promptly report to the supervisory center and the scene to remind relevant personnel on the spot to take preventive measures in a timely manner.
2.5 HD network video surveillance
The application of video surveillance occupies most of the security field, and real-time monitoring and recording of the radiation source working site is necessary. Especially in some important places (such as water plants, power plants, fixed sources and some special needs of mobile transportation sources), generally use high-definition network video surveillance technology.
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