The Design Of A X-γ Absorbed Dose Rate Continuously Monitoring Meter Based On AVR

Along with market economy developped by leaps and bounds, the wide application of nuclear technology production peaked fields.As the nuclear technology is used Widely,it also appeared nuclear pollution,nuclear leak and the accident happened to major nuclear terrorism.these events accident to humanity and nature brought severe panic.So,the radiation levels of environment is now an important content.The X-γdose of the air assessment is an important parameter environmental radioactivity.therefore , monitoring X-γin the air absorbing dose rate on environmental protection has important significance. Many radiation accidents are due to the lack of high sensitivity field radiation dose monitoring instruments. Because gamma ray spectroscopy surve measurement of ionizing radiation is highly efficient and accurate, economic method, X-γabsorbed dose rate continuously monitors is very significant.Based on analysis of domestic and international X-γradiation absorbed dose rate air monitoring instruments at present, Radiological monitoring instrument is expensive and generality is not strong. Based on advanced nuclear detection technology and electronic technology, Paper developed a method based on AVR micro-controller technology X - gamma air absorb dose rate monitors.This thesis mainly do work as follows:(1) Mastering plastic scintillation detectors circuit principle of work skillfully. Plastic scintillation detectors circuit switches x,γrays in air into voltage pulse signal.(2) MCU and external equipment set measuring parameters, timing read, processing the pulse signal of the count value and display air absorbed dose rate.(3) x-γair absorbed dose rate system's main software functions can be divided into two parts: one is the user interface, and selection function sets measuring parameters, such as measuring results, shows; aslo,it is superordination machine, the communication between a machine through serial communication, data communication mouth system test results to PC.(4) instrument commissioning and performance testing. the experiment shows the instrument has low power consumption, range wide and can satisfy the environmental level to protection class dose rate monitoring requirements.