Study On New Type Radiation Dosimeters Based On Diamond Thin Films

Diamond has a number of properties that make it a potentially remarkable material for use as a radiation dosimeter including high-temperature operation stability, high radiation hardness, the resistance to high irradiation fluxes and its tissue equivalence. In addition, the diamond is non-toxic and inert to tissue fluid, so it is suitable for in–vivo radiation detection. Up to now, single crystal diamond grown by CVD (chemical vapor deposition) and n-doped diamond have not been made a great breakthrough, therefore, the fabrication of high-performance radiation dosimeters based on diamond films with high phase-purity and high-degree preferential orientation has been one of the highlights.The aim of this study is to develop a new kind of radiation dosimeter based on diamond thin films to overcome drawbacks of the current widely used radiation dosimeters, such as low sensitivity, poor spatial resolution, low radiation hardness, short endurance and so on. In this paper, in order to obtain the diamond thin films with high purity and high-degree orientation, the influence of nucleation parameters, growth parameters and in-situ plasma post-treatments on the quality of diamond films was studied systematically using a bell-jar type MWPCVD (microwave plasma assisted chemical vapor deposition) setup. The surface morphology of diamond thin films was investigated by a fractal method. Radiation...