What is risk and what is making mistakes.

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Human Factors
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Time-outs
• A Time-out in the context of a linear accelerator calibration
might be a pause immediately prior to beam on in order to
carefully check all aspects of the set-up.
• A Time-out in this context might consist of a careful check of
• Geometry
• Field size
• Energy
• MU
• Having the check performed by a second physicist would
provide another layer of safety.
Violations Knowledge Rules Skill Power Distance