Hi. We are using a Pb-210 needle source for our cloud chamber science project. Are we correct that the tracks we are seeing inside the chamber radiating off the needle are: 1) Beta tracks from Pb-210 decaying into Bi-210 (in the .063 MeV range) 2) Beta tracks from Bi-210 decaying into Po-210 (in the 1.1 MeV range) 3) Alpha tracks from Po-210 decaying into stable Pb-206 (in the 5.4 MeV range) If that is correct, are the tracks being produced continuously and in equal amounts? Also, does that mean the radioactive decay chain of U-238 starts happening from the very first moment of the U-238's existence and continues to happen without ever stopping until all the atoms become stable lead? Thanks! We really appreciate your help.