Does anyone know the Intensity of the gamma of Natural Thorium (mR/h/mCi@1cm or R/h/Ci@1m)? Please include the reference, if available, and respond directly to me at: sewellwa@dunx1.ocs.drexel.edu Thank you! Wade Radiation Safety Office Drexel University 3141 Chestnut Street Philadelphia, PA 19104-2884 (215) 895-1701 http://httpsrv.ocs.drexel.edu/admin/radsafe/index.html