The activity of a radioactive sample is the number of decays perminute that occur in the sample. We measured this by detecting theradiation entering the Geiger tube window. Explain why our readingswere actually only a small fraction of the actual activity. Also,why did that not seem to matter in the determination ofBarium-137m’s half-life? Refer to either your A vs. t or your ln Avs. t graph in your explanation.
