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  1. What 234Th activity would you expect to find in a 0.25 g sample of uranyl nitrate (UO2(NO3)2.6H2O)?
  2. What mass of 234Th is this equivalent to?
  3. Calculate a relative standard deviation for the counts.
  4. What is the main reason for the seemingly very low efficiency of counting?
  5. What is the major sources of error in this experiment?
  6. Calculate a percentage yield for the experiment using the answer from Q1.
  7. If you assume the counting efficiency of the GM is around 8%, what does that make your yield?