The half-life of radioactive Technetium-99 is 6.0 hours. Find the number of 99Tc nuclei necessary to produce a sample of activity 1.9 µCi. (1 Ci = 3.7 × 10^10 decays/second)
a. 5.9E–2
b. 2.2E+9
c. 1.5E+9
d. 6.1E+5
e. 4.2E+5
b
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