Sometime after WWII, they built a synchrotron in the garage of the building next to my dorm. A synchrotron is a device that accelerates charged particles in a circle. This gives off gamma radiation which was used in various ways, and the particles themselves were smashed into various materials (hence, "atom smasher"). This was a while before my time there, but I was told that someone noticed that the window glass on the side of the dorm facing the synchrotron ("sync lab") was turning black from the radiation. The experiments were stopped, but the synchrotron was left largely in place.
It was surrounded by walls made of solid lead bricks; they were probably custom-made, as each had "Sync Lab" cast into one side. As a sort-of freshman initiation, the frosh were taken to this and told the stories. Students would take a brick as a souvenir, to be used as a doorstop or a bookstop, or for other purposes. I had two of them, myself. A friend of mine who had a dosimeter checked them out, and, as far as he could tell, they weren't radioactive, but who knows.