Question

If a sample has 24 grams of I-131 (half life is: 8 days), how many grams of daughter nuclide would there be after 32 days?

Answer 1

1/16

Explanation:

`32/8-=4`
So the I-131 will endure for 4 times its half live.
`(1/2)^4=1/16`

By words:
So after 8 days, will be reduced into half.
after 16 days into a quarter
after 24 days into an eight
after 32 days into 1/16.