Hey, On Monday I am doing an experiment to determine the half-life of protactinium (Pa), using a Geiger-Müller tube. The experiment itself is very straight forward and simple, but I have 70 minutes to do it in, which is alot of time. I was wondering if there was anything else I could do with this apparatus to make the time left over constructive? I have already used to to measure how penetrating certain particles are through different materials. The 70 minutes does not include time for writing up, so it is a long time, any ideas would be great. Thanks.