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The Miniaturized Detector for Application in Space (MIDAS) is a compactdevice with dimensions 5 x 5 x 1 cm3 which combines position sensitive Sidetectors and a fast neutrons spectrometer. MIDAS is developed with purpose toact as a linear energy transfer (LET) spectrometer for the charged particlesand measure dose and dose equivalent from both charged particles and neutrons.It is based on fully depleted monolithic active Si pixel sensors for thecharged track and energy deposition measurements, while a plastic scintillatorread out by a silicon photomultiplier is used to determine energy depositionsfrom fast neutrons. A simulation study of the detector response in galacticcosmic ray (GCR) radiation fields with the aid of GEANT4 has been performed.Energy depositions and hit pixel addresses have been used to reconstruct tracksand calculate LET spectra. A method to calculate $LET\infty$ in water from themeasured LET has been elaborated. Dose rate in water and dose equivalent ratehave been calculated. The energy and particle composition of the radiationfield produced by the interaction of GCR with the Al walls of a spacecraftmodel has been determined and the response of MIDAS in this radiation field hasbeen investigated.

GEANT4 simulation study of the response of a miniature radiation detector in Galactic Cosmic Rays and inside a spacecraft