We describe the detecting system of a high-energy charged particle telescope spectrometer for a space experiment to be performed on the outer surface of the Russian section of the International Space Station and other spacecraft, including small satellites.The spectrometer's detecting system is a multilayer scintillation detector (MSD) of polystyrene plates scanned by photomultipliers.It allows high-intensity fluxes of electrons (up to ~105 cm-2 s-1) several milliseconds long with energies of 3 to 30 MeV to be measured with an accuracy of ~1 μs, along with time profiles and the evolution of particle energy spectra.The MSD is characterized by an energy resolution no worse than 10%, an angular resolution of ~10 degrees, a geometric factor of ~40 cm2 sr, and a trigger system time resolution of ~20 ns.
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