Depending on the voltage, you might die immediately from being electrocuted, or a few days later from radiation poisoning. The stories of the people who died from the Therac-25 machine are probably instructive: https://en.wikipedia.org/wiki/Therac-25#Radiation_overexposu...
There's a Russian Physicist that was in an accident where a proton beam went through his head: https://en.wikipedia.org/wiki/Anatoli_Bugorski He lived but with some brain injury. I'm not sure what the differences in effect electrons vs protons and a focused vs diffuse beam would be though.
"...the Therac-20, which could produce X-rays or electrons of up to 20 MeV.
"This dual accelerator concept was applied to the Therac-20 and Therac-25, with the latter being much more compact, versatile, and easy to use. It was also more economical for a hospital to have a dual machine that could apply treatments of electrons and X-rays, instead of two machines. "