What is the order of magnitude of energy electron gains in a medical linear accelerator that is accelerated to 99% of the speed of light?

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In a medical linear accelerator, electrons are accelerated to very high speeds, close to the speed of light, to produce high-energy beams for treatments such as radiotherapy. The energy gained by these electrons is typically in the range of several million electron volts (MeV).

What Is the Order of Magnitude of Energy Electron Gains