CHARACTERIZATION OF THE PBI2 CRYSTAL AS A MATERIAL FOR RADIATION DETECTORS

We have been studying a radiation detector which uses lead iodide crys tal. The growth of PbI2 crystal used the two methods. One is the zone melting method and the other is the vapor phase epitaxy method. The pe rformance of the detector fabricated from a crystal grown by the forme r method showed better characteristics than the detector fabricated fr om the crystal grown by the latter. Results of XPS and PL measurements , suggest that the behavior of the iodine atoms in the crystal influen ced and controlled the performance of the detector.