Subject: Where can I find some everyday items that are radioactive?

I'm trying to do a demo for a class report on radioactivity and am looking for 
different materials I can bring as examples of radioactive samples in everyday 
life.  I was told that the mantles for Coleman lanterns used to have thorium in 
them.  I can't seem to get my hands on any of these though.  What other items, 
that we possibly use everyday, give off measureable levels radioactivity.  
I have a digital geiger counter for use in class.  It says it can read alpha, 
beta, and gamma rays.

Re: Where can I find some everyday items that are radioactive?