Study of super clean silicon homogeneity for nuclear radiation detectors

The peculiarity of silicon nuclear radiation detectors is mainly determined by the volume homogeneity of detector material. The homogeneity of detector silicon was investigated by the method of photo electrical probe. It is shown that this silicon has a sizeable axial and radial non homogeneity of resistivity and minority carrier life time which influence on spectrum resolution and noises of detector. The parameters of detectors with thickness of sensibility region about 4 mm and input window area 300 mm2 were estimated from β, γ-spectrum