So an experiment discussing the effectiveness of certain types of cloud chambers over others wouldn't necessarily be a good one? I was thinking of doing this for a school project, comparing the different methods of cloud chambers (dry ice, peltier cooled, compressed air, etc.) and discussing which would be best for the average person who wants to know specifications of the radiation on the environment to get. It occurred to me that they could buy a geiger counter, or, if cloud chambers were fairly cheap to make, get one of those. Do you think such a project would still be valid, or would it be way too much of a stretch?