Radiation Warning Sign  -  Pre-Trefoil (ca. 1945, 1946)
This radiation warning symbol pre-dates the current three-bladed radiation warning symbol   -  it was used at Oak Ridge National Laboratory for a short time after WW II.   Other symbols, such as a skull and cross bones, were used elsewhere.  For more details about the history of the radiation warning sign, click here, otherwise continue to view more images.                    

Donated by George Warlick 

Museum Directory       Radiation Warning Signs        

Last updated: 07/25/07
Copyright 1999, Oak Ridge Associated Universities