I don’t think it would be wise to wash your mouth out with thorium. However, I’m not so sure its strong enough to make you glow in the dark.
Thorium lamps (”Gas mantles”) were once quite common. They didn’t glow in the dark from nuclear radiation, however. Thorium transmits absorbed infra-red radiation as visible light, so “mantles” were commonly put over flame-based lighting to produce more light and less heat.
I wonder how well that would work with incandescent bulbs?