Consider a 5.28 gram sample of sodium iodide (NaI), of which .0160% of the iodine having a half life of 13 days. Take the atomic weights of Na and the remainder of the I to be 23.0 and the 126.9 amu, Respectively.
a. Determine the number of radioactive I-126 atoms in the sample.
b. What is the initial activity of the sample?
c. What is the activity of the sample after 147.0 days?
d. When will the activity of the sample be 6.88 micro ci?