Characterising the Lunar radiation environment using the Floating gate Dosimeters
An evaluation of the Lunar Zebro payload
S. Broere (TU Delft - Applied Sciences)
A. Menicucci – Mentor (TU Delft - Aerospace Engineering)
J. Plomp – Mentor (TU Delft - RID/TS/Instrumenten groep)
D. Lathouwers – Mentor (TU Delft - Applied Sciences)
H. Schut – Graduation committee member (TU Delft - Applied Sciences)
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Abstract
As humanity prepares to return to the Moon, understanding its complex radiation environment becomes increasingly critical. Radiation hardness assurance is essential to ensure that the payload remains operational and reliable under prolonged exposure to harsh space conditions. This thesis investigates the performance of the Floating Gate Dosimeter (FGDOS) as part of the Lunar Zebro nano-rover payload developed at TU Delft. The sensor’s response was evaluated through a series of irradiation campaigns: low-dose gamma radiation at the Reactor Institute Delft (RID), proton irradiation at HollandPTC, and mixed-field exposure at CERN’s CHARM facility. While the FGDOS demonstrated linear dose-response behavior and potential for spaceborne dosimetry, several limitations were identified, including reduced sensitivity, temperature dependence, and a firmware-related recharging issue.
A preliminary investigation into the use of a boron carbide layer showed a measurable increase in neutron sensitivity, suggesting its relevance for shielding strategies in mixed-field environments. Although the current payload is not yet flight-ready, it provides a robust foundation for further development. Future work should focus on high-flux gamma testing and refinement of both hardware and firmware to improve measurement reliability and system resilience in the lunar radiation environment.