some time ago, you had a post as to the origin, correct spelling, and real meaning behind the term tri-foil, is that accessable so i can re-read it? it has become a subject of conversation, and i would like to support it with an intellegant standpoint.
Look at the thread, Radiation Control Practices.
"Look at the thread, Radiation Control Practices."
Nothing comes up when I search.
Try this Link.
http://www.orau.org/ptp/articlesstories/radwarnsymbstory.htm