A pure sample of 226Ra contains 2.3 × 10^13 atoms of the isotope. If the half-life of 226Ra = 1.6 × 10^3 years, what is the activity of this sample?
a. 1.4E+10 decays/yr
b. 1.0E+10 decays/yr
c. 3.2E+2 decays/yr
d. 3.7E+16 decays/yr
e. 6.2E+6 decays/yr
b
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