Design A Radiation Survey Meter Based On Pressurized Ionization Chamber

Use of nuclear energy to the current serious energy crisis has brought a new dawn, Radioactive detection and treatment has brought great convenience to people’s life,Nuclear facilities has become an indispensable part of our lives. In order to improve the accuracy and stability of the nuclear test equipment and instrumentation of convenience, This paper developed anntelligent γ.х protective dosimeter based on high pressure ionization chamber, protective. The dosimeter instrument uses a high-pressure ionization chamber as detector,It’s a low-power, portable and practical protectant meter.Aiming at shortcomings and disadvantages of some domestic dosimeter with low precision, high power consumption, inconvenient to carry and a large number of of the use of imported equipment. Firstly, this paper studied the basic principle and method for measuring a variety of rays, Comparative analysis the advantages and disadvantages of various kinds of mainstream detector, Finally selected high pressure ionization chamber as detector. A high pressure ionization chamber use aviation aluminum to proce, For preventing the leakage of high pressure nitrogen to affect the sensitivity of ionization chamber, At the same time use collect gold plating technology on pole of ionization chamber to avoid ionization chamber of tiny current signal attenuation, improve the stability of the measurement. In the aspect of hardware to use STM32 MCU as the master control system, Based on the weak current collection of ionization chamber detector, design the low current integral circuit and based on the feedback of weak current integral type I-F conversion circuit. The circuit to convert the weak current signal into sawtooth voltage signal, and then converted into frequency signal, so has the advantages of good stability and strong anti-jamming capability, high measurement precision, wide range at the same time. For equipment intelligent, low power consumption and portability etc, Design the high stability, high efficiency "power circuit, low power consumption OLED display circuit, storage circuit and alarm circuit. In the aspect of software, use the KEIL MDK STM32 microcontroller programming using C language software platform, Implements the radiation dose of intelligent instrument, automatic measurement data storage, dangerous dose alarm, power management, communication Settings, and other functions. Measurement software use sliding filter algorithm and median algorithm as method, Make sure the data is more stable precision. Join the control algorithm, users need not multifarious operation, deducting background Automatic, According to the dose size automatically choose measurement process, Dangerous dose automatic alarm, Make the device more human operation. The accuracy of the measurement has reached the advanced level of similar foreign products.Now the shell mold are processing,The next step is to the market,This protective dosimeter has completed all the features of the debugging, functions meet the design requirements completely,Better services for monitoring of environmental.