Solution Found!
Solved: Iodine-131 is often used in nuclear medicine to obtain images of the thyroid. If
Chapter 17, Problem 70P(choose chapter or problem)
Iodine-131 is often used in nuclear medicine to obtain images of the thyroid. If you start with \(4.0 \times 10^{10}\) I-131 atoms, how many are left after approximately 1 month? I-131 has a half-life of 8.0 days.
Questions & Answers
QUESTION:
Iodine-131 is often used in nuclear medicine to obtain images of the thyroid. If you start with \(4.0 \times 10^{10}\) I-131 atoms, how many are left after approximately 1 month? I-131 has a half-life of 8.0 days.
ANSWER:Answer :
A half-life of 8 days means that every 8 days the half of the amount of I-131 decay...
So if you start with 4.0 × 10^10 atoms and you consider 32 days in a month (question says "approximately") your amount of atoms goes through 4 half-lives.
Then
4.0 × 1010/2 =5.43*1011