As you probably know, I like dice. I also like things which glow, and am not uninterested in radioactivity. I've had the idea to combine the three, but I cannot quite do it independently. Allow me to explain.
There is a technology known as tritium illumination. This uses the radioactive decay of a hydrogen isotope to excite a phosphor, which produces cold, visible light with no immediately obvious power source. It is possible to obtain small vials which produce this light; it is also possible to obtain clear plastic dice. With these, I would be able to create internally glowing dice, which would glow for a long time. The trouble is the price point; in order to make the project viable, an individual set of seven dice would have to sell for $80 before shipping. While it's possible to sell dice at that price point, they're a niche product, and I would not have the advantage of volume. I am also considering offering single d20s, which would sell at $11 before shipping. I am willing to make a limited production run of dice, glowing green (as the other colours are lower in light output), as long as I obtain sufficient interest. I would require pre-ordering with a deposit if I committed to a production run, and the run would be unlikely to be repeated. However, given sufficient interest, and as long as it turns out to be legal, I will do this.