1.
The activity of 1 g of radium defines the Curie (Ci), and turns
out to be 3.7 x 10^{10} disintegrations per second.
Knowing that the activity is αN, where N is the number
of atoms present, find the apparent decay rate α. You will
need to know that natural radium is mostly the longest lived
isotope, Ra^{226}.

2.
Use this decay rate α to find the corresponding radium half
life T_{1/2}.

3.
The half life of Ra^{226} is actually 1622 years. Why is
the answer to (2) above close to this but a bit shorter?

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