Question

Question #72f8f

Answer 1

One sixteenth part.

Explanation:

Half life means that half of the number of atoms you start with has decayed (i.e. emitted radiation):

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Iodine 131 has a half life of `8` days, so `32` days is four half lifes:

• 1 half life = 1/2 left
• 2 half lifes = 1/4 left
• 3 half lifes = 1/8 left
• 4 half lifes = 1/16 left

For more complex calculations you can use the equation:

`N(t) = N(0) * 0.5^(t/(T))`

In which `N(0)` is the number of atoms you start with, and `N(t)` the number of atoms left after a certain time `t` for a nuclide with a half life of `T`.