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June 2, 2024

Science

I purchased a radioactive source on 4/25/2019. Activity of the source is 1.05 micro curie, what is the activity on 4/25/ 2030. Half-life of the isotope is 40.05 years.

2) A source when placed on a detector yielded 10000 counts in 5 minutes. Background measurements indicated 20 counts in 10 minutes. What is the net count rate?

3) Based on the net count rate obtained in problem 2, what is the activity in Bq and curie if a detector of efficiency 0.05% was used to perform this experiment.

4) Calculate the number of atoms in 1 gram of Cs-137. Molar mass is 137 g/ mole; Half-life is 30.05 years; Avagadro’s number is 6.023 x 10^ 23 atoms/mole

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