J. Space Weather Space Clim.
Volume 12, 2022
Topical Issue - Space Weather Instrumentation
|Number of page(s)||8|
|Published online||01 April 2022|
GEANT4 simulation study of the response of a miniature radiation detector in Galactic Cosmic Rays and inside a spacecraft
Hellenic Army Academy, Vari, Attiki 16673, Greece
2 Department of Aerospace Science and Technology, National and Kapodistrian University of Athens, Psahna-Evia 34400, Greece
3 Greek Atomic Energy Commission, Agia Paraskevi, Attiki 15310, Greece
* Corresponding author: firstname.lastname@example.org
Accepted: 13 February 2022
The Miniaturized Detector for Application in Space (MIDAS) is a compact device with dimensions 5 × 5 × 1 cm3 that combines position-sensitive Si detectors and a fast neutrons spectrometer. MIDAS is developed with the purpose of acting as a linear energy transfer (LET) spectrometer for the charged particles and measuring dose and dose equivalent from both charged particles and neutrons. It is based on fully depleted monolithic active Si pixel sensors for the charged track and energy deposition measurements, while a plastic scintillator read out by a silicon photomultiplier is used to determine energy depositions from fast neutrons. A simulation study of the detector response in galactic cosmic ray (GCR) radiation fields with the aid of GEANT4 has been performed. Energy depositions and hit pixel addresses have been used to reconstruct tracks and calculate LET spectra. A method to calculate LET∞ in water from the measured LET has been elaborated. The dose rate in water and dose equivalent rate has been calculated. The energy and particle composition of the radiation field produced by the interaction of GCR with the Al walls of a spacecraft model has been determined, and the response of MIDAS in this radiation field has been investigated.
Key words: GEANT4 simulations / space dosimetry / depleted monolithic active pixel sensors
© K. Karafasoulis et al., Published by EDP Sciences 2022
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