I no longer have the mantles to take further readings, but I was using an ex Bundeswehr SV500 with a Mica Windowed LND probe which is very sensitive to alpha and the standard beta/gamma probe that is supplied with the SV500. The unit measures in both Gy/h and CPM, but I only paid attention to the CPM as the unit was calibrated using Cobalt-60 so the Gy/h reading is not going to be accurate. Alpha readings taken at close range were multiple times higher than other new stock Thoriated mantles and at a distance of three feet there was still a significant amount of beta and some gamma. I'm not someone who is scared of radiation, but I'm not an idiot either and without the ability to analyse these mantles using spectography I decided to err on the side of caution and dispose of them. I would always follow the advice of burning off any mantle outdoors as Beryllium is still used in the manufacture of all types of mantle. I still use other Thoriated mantles, but I usually keep them for outdoor use and stick to non-Thoriated peerless mantles for indoor use.