Development Of Intelligent Personal Radiation Dosimeter

At present,China,as a major country in the application of nuclear energy and technology,has continued to develop its nuclear industry,which is widely used in the military,medical,educational,scientific and energy fields,and has formed a complete nuclear industry system,which has greatly contributed to the high-quality development of our economy.Along with the development and use of nuclear energy,our country's nuclear security has also been presented with great challenges.When faced with a nuclear radiation accident,such as the loss of a radioactive source or contamination of the environment by radioactive waste,radionuclides usually expose humans to radiation through both internal and external exposure,endangering personal safety and even public safety.With the widespread application of nuclear technology in various industries,the importance of radiation safety monitoring is increasingly recognized,and researchers at home and abroad are carrying out research and development work related to personal radiation dosimetry,and related products are constantly updated and launched.Although China has vigorously carried out the development of related instruments in recent years,but still cannot meet the growing market demand,and from the point of view of working performance and design,there is still a certain gap between domestic instruments and imported products,and there is still a certain dependence on imported products.In view of this,a portable,low-power,intelligent personal radiation dose meter consisting of a low-power radiation dose measurement module and an intelligent measurement application(APP)has been developed in this paper,with the following main research content and results.(1)According to GB 18871-2002 Basic Standards for Protection against Ionizing Radiation and Safety of Radiation Sources formulated by the General Administration of Quality Supervision,Inspection and Quarantine of the People's Republic of China,the core function of this intelligent personal radiation dosimeter was positioned,the selection of the detector and related components was completed,the theoretical basis and performance indexes of the dosimeter were clarified,and the performance tests such as dose rate error,angular response and temperature response of the dosimeter were conducted.(2)Digital design,integrated nuclear pulse acquisition and processing technology,wireless Bluetooth communication technology and single-chip low-power design technology to develop low-power radiation dose measurement module.In this paper,an ultra-compact scintillator detector is constructed using Cs I(Tl)scintillator and Si PM;a signal conditioning module consisting of low-noise preamplifier,main signal amplification circuit and pulse-forming circuit is designed;a power management module consisting of low-noise low-voltage power supply,detector biased high-voltage power supply and reference power supply is completed.The test shows that the output voltage of the power management module is stable and the noise ripple is less than 5m V;the output signal-to-noise ratio of the signal conditioning circuit can reach 27.2.(3)In this paper,the low-power MSP430 microcontroller as the core controller,using Code Composer Studio 6.2.0 integrated development environment,the embedded low-power control program and the design of the fast response window average pulse count smoothing algorithm are designed using C language.The tests show that the modules of the MCU work reliably and reliably with low power consumption;the nuclear pulse data smoothing algorithm has a good smoothing effect,which can reduce the measurement error caused by statistical rise and fall,and can respond quickly to radiation mutations in the environment.(4)Android APP was developed for use with the radiation dose measurement module.This paper uses Android Studio development platform and JAVA language to design the interface and function development of the APP.The interface of the APP is simple,interactive and easy to operate.The functions of account registration,wireless Bluetooth communication connection,real-time radiation dose measurement and display,ultra-threshold alarm and data management analysis are realized.The main points of innovation in this paper are summarized as follows.(1)This paper developed a low-power radiation dose measurement module,small and beautiful,no external battery,support Android phone Type-C interface hot-swappable,while using OTG reverse charging function to achieve plug-and-play.(2)In this paper,an APP for personal radiation dose meter is developed,which enables real-time measurement and display of radiation dose,wireless communication connection,ultra-threshold alarm and data management and analysis through simple and intelligent operation.(3)In this paper,a fast response window mean pulse count smoothing algorithm with a good smoothing effect is designed to ensure not only a sufficiently small relative error between the measured data and the true value,but also a fast response to radiation mutations in the environment.