Therac-25



         


Therac-25 was a radiation therapy machine that was involved with at least six known accidents between 1985 and 1987, in which patients were given massive overdoses. It highlighted the dangers of software-related operation of safety-critical systems (see computer bug).

These incidents have become a standard case study in the history of computing and medicine.

The machine was built by the Atomic Energy of Canada Limited (AECL).

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