A Dual-energy X-ray detector on the basis of ZnSe(Al) and LGSO(Ce) composite scintillators

The results of tests of an experimental prototype of a two-energy scintillation detector, which is based on a two-layer composite system of fine-crystalline ZnSe(Al) and LGSO(Ce) scintillators, are presented and its properties are determined. The X-rays spectra for each element of the detector were obtained. The analysis of these spectra allowed determination of the energy efficiency of the X-ray absorption for each element of the detector in an energy range of 30–70 keV. The dependences of proper signals from photodetectors under the action of X rays (the tube voltage varied from 40 to 90 kV) were restored. The corresponding X-ray spectra are presented as well. The dependences of scintillation signals from disperse ZnSe(Al) and LGSO(Ce) scintillators on the X-ray tube voltage are presented (the voltage varied from 40 to 70 keV). Due to the high registration efficiency of relatively low-energy X rays (up to 70 keV), this detector can be used not only in engineering introscopy (customs baggage control, mail, cargo-container, and vehicle checks, etc.), but also in various fields of medical radiology.