Radiation environment monitor

The radiation Environment Monitor (REM) is a modular, programmable monitor for the radiation environment on spacecrafts. REM accumulates differential linear energy transfer spectra of two independent silicon detectors with different shieldings. The instrument is sensitive to protons with energies between 30 MeV and 600 MeV and to electrons with energies between 1 MeV and 10 MeV. the year 1994 two REM instruments were launched into space, one into a geostationary transfer orbit and one into a low earth orbit. Both instruments are working well and provide simultaneous information on the space radiation environment of different orbits.