Iodine 131 half life is 807 days If your given 43 Ug microg

Iodine 131 half life is 8.07 days. If your given 43 Ug (micro-g) of iodine 131 how much of it remains in your body after 14 days?

Solution

No of half lifes( n) =total time / half life = 14/8.07= 1.73 days

Amount of substance remains N=No(1/2)ⁿ

N= 43(1/2)^1.73 = 12.96 micro grams.