well, according to the Solar Calender the main producer of all Xalium 17 there's ever been became unstable and uninhabitable like Chernobyl, only now, a couple thousand years later is it becoming slightly less Xalium Radioactive. They are still forced to use protective gear for other reasons than visible light, they wear gear for that and most certainly the still incredibly high amounts of Xalium radiation present on the planet's surface.