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Area of Science:

  • Electronics Engineering
  • Radiation Effects Science

Background:

  • Commercial off-the-shelf (COTS) electronics are increasingly used in radiation environments.
  • Understanding the radiation hardness of COTS components like Raspberry Pi is crucial for reliable system design.

Purpose of the Study:

  • To evaluate the total ionizing dose (TID) effects on commercial Raspberry Pi computer boards.
  • To determine the radiation tolerance limits and identify potential failure mechanisms.

Main Methods:

  • Formal TID testing using a 60Co gamma-ray source.
  • Continuous biased operation, voltage monitoring, and live computational testing during irradiation.
  • Exposure to dose rates of approximately 2.61 mGy(Si)/s.

Main Results:

  • Raspberry Pi boards demonstrated potential tolerance doses approaching 500 Gy(Si).
  • No significant degradation was observed in memory, voltage rails, or Input/Output (I/O) functionality.
  • CPU performance showed a slight increase in deviation likelihood with accumulated dose.
  • The Secure Digital (SD) card emerged as a critical component weakness.

Conclusions:

  • Raspberry Pi boards exhibit considerable radiation tolerance for TID, suggesting suitability for certain radiation-exposed applications.
  • Redundancy and spot-shielding strategies could mitigate observed weaknesses, particularly for SD card reliability.
  • Further investigation into specific component vulnerabilities and mitigation techniques is warranted.