Good evening RadSafers, We have some piping insulation that seems to be very rich in natural thorium. It's trade name is Raowool ("Ray-O-Wool"). Can any of you give me some idea of what, where, when, etc. that this material was manufactured, and an idea of why it might be thoriated? Thanks, Jim Barnes, CHP RSO Rocketdyne Division; Rockwell Aerospace jgbarnes@ix.netcom.com