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Definition

Total Ionizing Dose

TID

The cumulative absorbed radiation dose over a mission lifetime, measured in rads or grays. Drives selection of radiation-hardened parts and shielding mass for long-life missions.

Related terms

Test Readiness ReviewTRR

A phase gate review confirming that the test program, test procedures, test facilities, and test articles are ready for ...

Thermal Control SystemTCS

The subsystem that maintains spacecraft temperatures within acceptable ranges. Uses passive methods (coatings, MLI, radi...

Two-Line Element SetTLE

A standardized 70-character text format for representing the orbital elements of an Earth-orbiting object at a specific ...

True Anomaly

The angle from periapsis to the spacecraft's current position, measured at the focus of the orbital ellipse. Tracks wher...

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