BuyFindarrow_forward

College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000

Solutions

Chapter
Section
BuyFindarrow_forward

College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000
Textbook Problem

The activities of 131I and 123I used in thyroid scans are given in Table 32.1the 50 and 70 μCi, respectively. Find and compare the masses of 13lI and 231I in such scans, given their respective half−lives are 8.04 d and 13.2 h. The masses are so small than the radioiodine is usually mixed with stable iodine as a carrier to ensure normal chemistry and distribution in the body.

To determine

The comparison between the masses of I131 and I123.

Explanation

Given info:

The activity of I131 is

  A=0.05m·Ci

The half-life of I131 is

  T1/2=8.04day=8.04×24×3600sec

The activity of I123 is

  A=0.07m·Ci

The half-life of I123 is

  T1/2=13.2h=13.2×3600sec

Formula used:

The mass can be found as

  m=NNa×molarmass

Calculation:

Mass of I131

The activity

  A=0.05m·Ci=0.05×3.70×107BqA=1.85×106Bq

Activity is defined as

  A=Nln2T 1 2N=AT1/2ln2

Substituting the values

  N=(1.85×106Bq)×8.04×24×3600secln2N=1.85×1012atoms

Substituting all values, the mass of mI131 is

  mI131=1.85×1012atoms6.02×1023atoms×131gmI131=4.03×1010g

Mass of I123

The activity

  A=0.07m·Ci=0

Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started

Additional Science Solutions

Find more solutions based on key concepts

Show solutions add

Explain why somebut not allof an organism's genes are expressed.

Biology: The Unity and Diversity of Life (MindTap Course List)

A person who wishes to meet nutrient needs while not over consuming calories is wise to master a. the concept o...

Nutrition: Concepts and Controversies - Standalone book (MindTap Course List)

How are the adenine nucleotides linked together in the poly-A tails?

Introduction to General, Organic and Biochemistry

What name is given to the cellular supply of amino acids?

Chemistry for Today: General, Organic, and Biochemistry

Show that Equation 32.28 in the text Ls Kirchhoffs loop rule as applied to the circuit in Figure P32.56 with th...

Physics for Scientists and Engineers, Technology Update (No access codes included)