Total Ionization Dose Measurement onboard a 1U CubeSat in Low Earth Orbit.

The TMCR (Total Ionizing Dose Measurement of COTS and Onboard Rad-Hard Components Mission) mission onboard BIRDS-4, a 1U CubeSat, is attempting to measure changes in the electrical properties of semiconductors due to total ionizing dose effects. The mission has two objectives. The mission has two objectives: the first is to verify the accuracy of the TID tests performed on the ground. The second is to validate a system to measure radiation dose from the change in drain current of commercially available MOSFET devices. Based on the measurement of 237 days in LEO of 51degree inclination and 400km altitude, no significant changes in drain current have yet been observed, indicating a deviation from the results of the ground tests.