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# Solved: Iodine-131 is often used in nuclear medicine to obtain images of the thyroid. If

ISBN: 9780321910295 34

## Solution for problem 70P Chapter 17

Introductory Chemistry | 5th Edition

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Introductory Chemistry | 5th Edition

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Problem 70P

Iodine-131 is often used in nuclear medicine to obtain images of the thyroid. If you start with 4.0 × 10101-131 atoms, how many are left after approximately 1 month? 1-131 has a half-life of 8.0 days.

Step-by-Step Solution:
Step 1 of 3

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. atoms after 8 days=1 half-life .

5.43*1011/2 =1.62*1011  atoms after 16 days = 2 half-lives .

1.62*1011 /2 = 8.1*1011   atoms after 24 days = 3 half-lives.

8.1*1011  /2 =1.2*1011  atoms after 32 days = 4 half-lives .

You can even see that 1.2*1011 atoms of a radioactive material decaying in 1 second is an amount

know as1.2 GBq (gigabecquerel), or 100 mCi in not-SI units.

Such a high amount of I-131 is usually used to treat thyroid cancer

in Nuclear Medicine facilities.

Step 2 of 3

Step 3 of 3

##### ISBN: 9780321910295

The full step-by-step solution to problem: 70P from chapter: 17 was answered by , our top Chemistry solution expert on 05/06/17, 06:45PM. Since the solution to 70P from 17 chapter was answered, more than 348 students have viewed the full step-by-step answer. This textbook survival guide was created for the textbook: Introductory Chemistry, edition: 5. This full solution covers the following key subjects: approximately, atoms, days, half, images. This expansive textbook survival guide covers 19 chapters, and 2046 solutions. Introductory Chemistry was written by and is associated to the ISBN: 9780321910295. The answer to “Iodine-131 is often used in nuclear medicine to obtain images of the thyroid. If you start with 4.0 × 10101-131 atoms, how many are left after approximately 1 month? 1-131 has a half-life of 8.0 days.” is broken down into a number of easy to follow steps, and 36 words.

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Solved: Iodine-131 is often used in nuclear medicine to obtain images of the thyroid. If