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... confirm ...One curie is that quantity of material of which 3.7E10 atoms disintegrate/sec
...Th-228 (half-life 1.913 years) is dissolved in water, at the concentration of 0.03 ppb. What is the activity of that isotope? (ignore activity of daughters).
Answer: 3.57*10^-4 Ci.
...
Ludwik