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Episode 121: Therac-25

Well There‘s Your Problem

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The Therak Six and Therak 20 - The Same Error

When you put in an X, it defaults to 25 mega electron volts of X ray photons. During the magnet setup process, the software clears all of the internal data several times. So, if you make changes to the prescribed treatment modality within that approximately eight second window,. It displays the corrected prescription information on the operator screen. But because of the hardware interlocks, then the didn't didn't have any instance because the beam didn't fire or refuse would blow. Oh, my God. They dug out the software for the Therak six and the Therak 20 and it couldn't produce the same error.

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