The exposure to elevated radiation levels in space poses significant risks to spacecraft, space stations or satellites. Therefore, it is crucial to assess these risks associated with prolonged radiation exposure during any space mission. This thesis primarily focuses on the radiation environment in Low Earth Orbit (LEO) and investigates the interaction between particles in this environment and various materials. By utilizing established empirical software models from SPENVIS, the thesis examines the dosage experienced as a result of radiation sources in the LEO space environment, considering factors such as orbital altitude, orbital inclination, and mission duration. The study delves into the physical processes that can lead to failures and long-term deterioration of electronic devices caused by solar radiation, high concentrations of trapped electrons and protons in the Van Allen radiation belts, as well as Galactic Cosmic Rays (GCRs). Additionally, this thesis examines the influence of these radiation sources on electronic components and systems carried on spacecraft. Moreover, the objective of this research is to provide an up-to-date overview of various methods employed to mitigate the impacts of ionizing radiation. Through the comparisons, it has been discovered that the parameters of the space radiation environment exhibit expected variations in relation to solar activity. During periods of solar maximum, the fluence of trapped electrons and solar protons tends to be higher compared to solar minimum conditions. Conversely, the fluence of trapped protons and galactic cosmic rays is greater. However, it is worth noting that during maximum solar activity, Total Ionizing Dose (TID), Total Ionizing Dose (DDD), and Single Event Effects (SEEs) all demonstrate higher values compared to minimum solar activity. For small satellites orbiting in this region, it is essential to employ shielding materials as the observed levels of TID, DDD, and SEE can potentially pose concerns for space systems engineers. However, ...
Study of COTS devices in ionizing radiation environments
27.06.2023
Hochschulschrift
Elektronische Ressource
Englisch
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