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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.

The excitation conditions have been studied and the accuracy and sensitivity estimated of the MECA‐10‐44 energy‐dispersive x‐ray fluorescence spectrometer, in the determination of contents of 10 major and 25–30 rare and scattered elements in samples of rocks and ores. The use of the instrument for the rapid routine analysis of geological samples for separate groups of elements has been demonstrated; when carrying out combined geochemical investigations, such an instrument represents an essential link in the system of analytical methods applied for complete elemental composition analysis.