Silicon Lithium Detectors for Synchrotron Energy Dispersive X-Ray Fluorescence Spectroscopy

Introduction Detector description and its principle of operation Detector module. Detector Features and its Performance EDXRF of Fe 55 Spectrum Detector comparison with Silicon Drift Detector SDD Concluding remarks References A Silicon Lithium Si(Li) detector is presented. The detector structure and its working principle are explained. The detector is cooled to 77o K by liquid Nitrogen. The detection system has a high energy resolution. Energy resolutions of the system at active areas of 10, 30, 50, 80 (mm2) of the detector are 127, 133, 139, 148 eV FWHM at 5.9 KeV Mn Ka. Si(Li) detector has efficiency greater than 25% over a range of x-ray energy of (1.5 KeV – 25 KeV) and it can be used for energies greater than 25 KeV. Si(Li) detectors are famous in being widely used in Synchrotron Energy Dispersive X-Ray Fluorescence (EDXRF) spectroscopy. Efficiency of Si(Li) detector is compared with efficiency of the superior Silicon Drift Detector SDD by having a higher count rate. Also, its efficiency is compared with the efficiency of Cadmium Telluride CdTe detector that covers energy range of (40 KeV – 100 KeV). Abstract