If the initial sample is 2.50 g, what mass of the original iridium-192 remains after 5 days? 1.5 mass remaining: Incorrect Estimate the half-life of the radioisotope. half-life: 75 days How many days would it take for one-third of the sample to decay? 63 time: days Incorrect
If the initial sample is 2.50 g, what mass of the original iridium-192 remains after 5 days? 1.5 mass remaining: Incorrect Estimate the half-life of the radioisotope. half-life: 75 days How many days would it take for one-third of the sample to decay? 63 time: days Incorrect
Chemistry: An Atoms First Approach
2nd Edition
ISBN:9781305079243
Author:Steven S. Zumdahl, Susan A. Zumdahl
Publisher:Steven S. Zumdahl, Susan A. Zumdahl
Chapter18: The Nucleus: A Chemist's View
Section: Chapter Questions
Problem 19E
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Transcribed Image Text:n 14 of 20 >
If the initial sample is 2.50 g, what mass of the original iridium-192 remains after 5 days?
1.5
mass remaining:
Incorrect
Estimate the half-life of the radioisotope.
half-life:
75
days
How many days would it take for one-third of the sample to decay?
63
time:
days
Incorrect
Transcribed Image Text:n 14 of 20
Iridium-192 is one radioisotope used in brachytherapy, in which a radioactive source is placed inside a patient's body to treat
cancer. Brachytherapy allows the use of a higher than normal dose to be placed near the tumor while lowering the risk of damage
to healthy tissue. Iridium-192 is often used in the head or breast.
Use the radioactive decay curve of iridium-192 to answer the three questions.
100
90
80 -
70-
60 -
50 -
40-
30
20
10
10
20
30
40
50
60
70
80
90
100
110
120 130
140
150 160
170 180
190
Time (days)
If the initial sample is 2.50 g, what mass of the original iridium-192 remains after 5 days?
Sample
remaining (%)
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