Portable Compton Backscatter Imager

Compton Back-Scattering is a new type of non-destructive inspection technology. Its best advantage is that the radiation source and the detector can be positioned in the same one side of the object being inspected. It can resolve some difficulties of non-destructive inspection that TICT can't do. Mainly its disadvantage is that the back-scattering beam is very weak, that the signal-to-noise ratio is lower. Recently the research of Compton Back-scattering in the world is belonged to high energy CT. The device is very big, much heavy, isn't suitable to the portable use. In the same time, up to now there isn't a complete application theory of Compton Back-Scattering.The main contents of the thesis are as follows:1. Synthetically evaluate the latest application case of Compton Back-scattering according to the papers at home and aboard. Describe the concept and the application theory of Compton Back-scattering in detail.2. Do some necessary calculations and decide on the general scheme of Compton Back-Scattering Imaging Scanner to the real wall inspection. Include the selection of radioactive source, the calculation of Compton Back-scattering beam, the calculation of the basic condition of finding out the different materials and the determination of some important parameters as well.3. Design a new kind of safe shielding container of radioactive source. Its feature is that the work position of all pre-collimator's holes can be selected and put into the use by the computer automatically.4. Design the system of detection and data acquisition and transmission of Compton Back-Scattering Imaging Scanner, provide some important indexes and methods that are used to assess this system.5. Design the scanning movement control unit of Compton Back-Scattering Imaging Scanner, mainly point out the control targets clearly, describe the control principle, etc. Discuss the features and technical indexes of this unit.6. Design the software of Compton Back-Scattering Imaging Scanner, point out the functions of this software. Give out the program modules in which the directory andcontents of this software is included. Give out the interfaces of the main program modules and describe the meanings of operating elements on these program interfaces briefly.7. According to the application theory of Compton Back-scattering that the writer had researched, he developed and produced its portable application devices successfully. After the experiment and on-the-spot application, its efficiency is as good as even better than the design indexes. It could be widely used in the areas such as the engineering, the military, the police and the customs.