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Determination of Randon and Gamma Radiation Dose Using Wireless Magnetoelastic Sensors

Author: DuZuo
Tutor: LiaoLiFu
School: Nanhua University
Course: Analytical Chemistry
Keywords: Radon γ-ray Wireless sensor Magneto-elastic Nuclear track Radiation dose
CLC: TP212.9
Type: Master's thesis
Year: 2011
Downloads: 28
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Abstract


This thesis is summarized in the preamble of the characteristics and dangers of radon and gamma rays, and an overview of the research progress of the detection of radon and gamma rays. Then describes the basic structure and working principle of the wireless magnetoelastic sensor, wireless magnetoelastic sensor application research progress. Wireless magnetoelastic sensor detects radon and gamma-ray radiation dose of this paper, the new method also provides an overview. Wireless magnetoelastic sensing principle, the paper mainly do the research work of the following two aspects: (1) a new method of a solid-phase wireless sensor nuclear track radon measurements. In this method, through the film on the magneto-elastic metal sheet coated with a layer of polymethyl methacrylate (PMMA) was constructed for measuring radon magnetoelastic sensor. Magneto-elastic sensor technology can wirelessly detecting magnetic resonance frequency of the elastic sheet changes the unique nature of this resonance frequency variation corresponds to a change in mass of the magneto-elastic sheet. When the sensor is exposed to radon environment, the PMMA film can generate a potential nuclear track radon emitted alpha particle collision sensors. After chemical etchant etching treatment, the potential of nuclear diameter trace expanded and sensor mass loss, causing the sensor to a resonant frequency change occurs. For quantitative determination of radon through the detection of the resonance frequency variation. Etchant concentration, etching temperature and etching time measurement. 20% (w / w), in the concentration of the etchant for the etching temperature was 80 ° C and etching time of 18 min, under optimum conditions, the measurement of radon in the linear range of 1.2 × 105 to 3.60 × 106 Bq m? H The detection limit of 20.3 × 103 Bq m-3 h. The application of the method of determination of the actual air samples radon measurement results and semiconductor detection method consistent with satisfactory results. (2) establish a method of application magnetoelastic sensor wireless sensing method for the determination of the radiation dose. The method is based on the γ-ray of acrylamide (AM) can lead to the occurrence of polymerization reaction, resulting in a change in the solution viscosity occurs, and the change in viscosity of the solution can be a magneto-elastic sensor for detecting the fact that establishing. The unique nature of the magneto-elastic sensor technology can be wireless detecting magnetic resonance frequency of the elastic sheet changes, the change of this resonance frequency corresponding to a change in the magneto-elastic pieces are immersed in the solution viscosity. Through the resonance frequency changes in the quantitative measurement of the radiation dose of the gamma-ray. Under suitable conditions the frequency shift of the resonance frequency of the linear relationship between radiation dose, the determination range of 0 ~ 50 Gy, the detection limit was 0.25 Gy. Advantages of the present method has real-time, continuous, in-situ monitoring. Application of the present method of determination of γ-ray dose in the actual environment, the results are satisfactory.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation components,parts > Transmitter ( converter),the sensor > Sensor applications
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