I was reading about the uranium glass we have, and found this tid bit...
We all are living under varieties of naturally existing radiations on the earth.
Indeed, we ourselves have radioactive substances in our body.
For instance, a human body contains natural potassium, equivalent to about 0.2% of his body weight.
This natural potassium is a radioactive substance.
Therefore, if he weighs 50 kg, he has a radioactivity of about 3000 Bq.
In other words, his body has about 3000 emissions of corpuscular and electromagnetic radiations from potassium in a second, throughout his all life.
And that's not even taking into account Carbon-14.
Now if only I could glow in the dark. Now THAT would be cool.