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γ-ray Detection Instrument for Environment Monitoring

Author: ChenShouFeng
Tutor: WangYinFeng
School: Chongqing University
Course: Theoretical Physics
Keywords: Environmental γ -ray detection Scintillation counter OP37 amplifier circuit ATmega16 microcontroller
CLC: TL81
Type: Master's thesis
Year: 2009
Downloads: 149
Quote: 2
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Abstract


This article is designed for environmental γ ray detection apparatus, divided into hardware and software. Software components : γ -ray measurements in the environment , can be off by Radioactive influence the relative error of measurement 1 N; N is recorded in the measurement time by the number of pulses ( number of particles ) . To ensure accuracy , it is necessary to guarantee a certain count , the radioactivity measurements , it is usually used mainly as way timing measurements at low intensity measuring timely , must be automatically extended measurement time to ensure that the total number is greater than required to ensure accuracy under limits. So each time based on the measurement of radioactive intensity is automatically selected , but the final results of the measurements given at different times and it must be converted to the same time count the count . The data processing method is called normalization . Hardware components: environmental γ -ray detector hardware is the focus of this paper is divided into the probe , linear amplification circuit and microprocessor systems. Probe probe consists of NaI (Tl) scintillation crystal and photomultiplier tube (PMT), high voltage transformer components. Γ -rays can be converted into electrical signals. RC linear amplifier circuit are formed and amplifier circuitry . Which amplifies the electric signal output from the probe , the signal is shaped to meet the requirements . Selected OP37 precision operational amplifier. Analysis of the dispersion of components on circuit performance , the design of low-noise , high common mode rejection ratio of γ -ray amplifier circuit system, using ORCAD / PSpice software for the design of circuit simulation verification, design the amplifier circuit system a printed circuit board. SCM system using ATmega16 microcontroller , control circuitry and software . Choose a reasonable test for detection program , the detector circuit ongoing testing and refinement . Experimental results show that the amplification circuit system gain range : 40 to 1000 , Bandwidth : 1 ~ 300Hz, common mode rejection ratio of 106.7dB. Thesis on design alternatives analysis and comparison , after initial adjustment , the circuit still some noise preamplifier can be further improved.

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CLC: > Industrial Technology > Nuclear technology > Particle detection,radiation detection and nuclear instrumentation > Radiation detection technology and instrumentation
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