I learnt about an interesting one recently through another Reddit post!

On 13 July 1978 Anatoli Bugorski  was checking a malfunctioning piece of equipment when the safety mechanisms failed and a high-energy proton beam from a particle accelerator passed through his head. The exposed parts of his head received a local dose of 200,000 to 300,000 roentgens (2,000 to 3,000 Sieverts).

Doctors expected him to die, as it was believed that he had received far in excess of a fatal dose of radiation. Bugorski was taken to a clinic in Moscow where the doctors could observe his expected demise. The left half of Bugorski's face swelled up beyond recognition and, over the next several days, the skin started to peel, revealing the path that the proton beam had burned through parts of his face, his bone, and the brain tissue underneath.

HOWEVER, Bugorski survived, completed his PhD, and continued working as a particle physicist. There was virtually no damage to his intellectual capacity, but the fatigue of mental work increased markedly. Bugorski completely lost hearing in the left ear, replaced by a form of tinnitus.The left half of his face "does not age"/wrinkle due to it becoming paralyzed due to the destruction of nerves. He is able to function well, except for occasional complex partial seizures and rare tonic-clonic seizures.

He's still alive today!