Solution: The curie (Ci) is a commonly used unit for
Chapter 20, Problem 20.22(choose chapter or problem)
The curie (Ci) is a commonly used unit for measuring nuclear radioactivity: 1 curie of radiation is equal to 3.7 3 1010 decay events per second (the number of decay events from 1 g of radium in 1 s). a. What mass of Na2 38SO4 has an activity of 10.0 mCi? Sulfur-38 has an atomic mass of 38.0 u and a halflife of 2.87 h. b. How long does it take for 99.99% of a sample of sulfur-38 to decay?
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