Being an ex-uranium geologist....a thorium mantle is nothing, everyone will do whatever they think is necessary to protect them from radiation....but I"m not a big worrier, seems like every time you turn around there is something that is going to kill you, just wait a month...somehow, it'll change.
There are many forum members have no idea of what the background radiation is on the geologic formations that their houses are built on, (more than a mantle). Many of you are too young, to remember radium dialed watches and alarm clocks! Gotta love that good old "glow in the dark", hey...we also used to have seeds that were irradiated and were promised to grow much larger vegetables back in the early 60's. If any of you have concerns on the Peerless mantles...please send them all to me to be disposed of properly. Doug