Hardly unique. Lots of people (myself included) have walked through accelerator beams, and most suffered no ill effects. He must have held the position for some time. The guys tuning the heavy ion beam at RHIC used Cerenkov light in their eyeballs to check the beam position; that was dumb. But you're certainly doing your part to propagate paranoia about all forms of radiation. You might want to read up: https://jick.net/skept/RadHaz/