Radium seems to be a hot subject...
There appers to be much on the internet on this subject, good, bad and uninformed.
Radium is a radioactive element that was used widely in clock faces and instrument faces in the past that posed a threat to health when improperly used (eaten). It may pose health issues if inhaled, eaten or placed in close proximity to ones body for extended exposure like a pocket full of old glowing pocket watches. But then the fear factor and reality of the danger covers most everything that we come in contact with today.
A suggestion is to read and learn as much as you can on the subject before buying a boat load of the gadgets.
http://www.madsci.org/posts/archives/19 ... .Ch.r.html
Good luck on your display.