The main change in the Therac-25 over previous versions like the Therac-6 and Therac-20 is that the Therac-25
A) used a different source of radiation that is more dangerous to human health.
B) had no mechanical interlocks to set the amount of radiation; radiation amount was controlled by software.
C) was much more difficult to operate properly.
D) None of the above

Question

Quizplus · Accepted Answer

The main change in the Therac-25 over its predecessors was the removal of mechanical interlocks for setting the radiation amount, relying instead on software controls. This design change led to several fatal accidents due to software errors, highlighting the importance of hardware safety mechanisms in critical systems.

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