Half-Life of Radon

²²²₈₆Rn is the first decay product of ²²⁶₈₈Ra . Radon’s activity is much greater than that of its parent. It is the
heaviest of all gases (atomic mass = 222), with a density of almost 10 g/L. Like radium, it is hazardous to handle
and should be used with adequate protective shielding.
Assume you have an initial sample of radon with a mass of 48 g. Assume the half-life of radon is about four days.
On the grid below, plot the amount of radon left after each four-day time period.
 

Questions

       1.  How many grams of radon would be present after 4 days?

       2.  How many grams of radon would be present after 12 days?

       3.  How many grams of radon would be present after 24 days?

       4.  If 8 g of radon are left, what is the time elapsed?

       5.  How many grams of radon would be present after 6 days?
 
 
 

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