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The design and features of a sealed-off proportional scintillation gas-filled detector (GSPC) are described. The use of a 50 µm Be window and an Xe-based gas mixture provides high efficiency of registration in the range 1.5-25 keV. The energy resolution changes from 18% for Al Ka (1.49 keV) to 4.2% for Ag Ka (22.2 keV). When the count rate on the unit output is 5 × 10 4 s −1 , the energy resolution at the Mn Ka line does not exceed 9% at an entrance window area near 3 cm 2 . The detector is operated at room temperature and does not require maintenance during operation. The service life of the detector is over 5 years and the radiation lifetime is practically unlimited. The detector is designed for use in EDXRF spectrometers instead of gas-filled proportional counters.

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