Question: The following counting rates were obtained on a sample that was identified as a pure beta emitter: Time (day) 1 2 3 5 10 20

The following counting rates were obtained on a sample that was identified as a pure beta emitter:

Time (day) 1 2 3 5 10 20 Activity (cpm) 5500 5240

Time (day) 1 2 3 5 10 20 Activity (cpm) 5500 5240 5000 4750 4320 3400 2050 (a) Plot the data on semi-log paper. (b) Determine the half-life from the graph. (c) What is the value of decay constant (in per day)? (d) Write the equation for the decay curve. (e) What is the radionuclide in the sample?

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