Total Ionizing Dose (TID) Effects


Electronic devices suffer long-term radiation effects, mostly due to electrons and protons. The main sources of these particles are Solar Energetic Particle Events - which usually occur in association with solar flares - and the South Atlantic Anomaly (SAA) - where the Earth's magnetosphere dips closest to the earth, causing more trapped radiation. Cumulative long term ionizing damage due to protons and electrons can cause devices can suffer threshold shifts, increased device leakage (& power consumption), timing changes, decreased functionality, etc.

Device shielding can help, but several factors must be considered. Shield geometry & analysis technique, shield material composition, and device composition are all relevant in predicting shield effectiveness. Electrons can be effectively attenuated by aluminum shielding even at high energies. However, while aluminum shielding is effective for low-energy protons, it is ineffective for the high-energy protons (>30 MeV).

A list of parts that have been tested for TID since 1991 is available. Reports are now available on line.
Total Dose Testing is performed at the Goddard Space Flight Center Radiation Effects Facility (GSFC REF).
Total Dose testing at NASA/GSFC is handled by Dr. Robert Reed. Please contact him for further TID information, or contact Ken Label if you have a candidate new technology device.


A few useful links:

NASA/GSFC TID Parts
NASA/GSFC Parts Database
Information on electrical, electronic, and electromechanical (EEE) parts for the support of all NASA missions is available from NASA/GSFC's EEE Parts Information Management System
EEE Links - a NASA/GSFC publication concerning parts, packaging, and processes
NASA/JPL RADATA parts data base
REDEX parts data base, compiled by Naval Research Lab (NRL)

If you know of any other relevant links or documents, please let me know! Martha O'Bryan

Return to Radiation Effects & Analysis Home Page
Curator: Martha O'Bryan
Last Revised January 7, 2004
A service of the Radiation Effects and Analysis Group, Kenneth A. LaBel, Group Leader