Iridium-192 is one radioisotope used in brachytherapy, in which a radioactive source is placed inside a patient's body to treatcancer. Brachytherapy allows the use of a higher than normal dose to be placed near the tumor while lowering the risk of damageto 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.1009080706050-40302010-102030405060708090100 110 120 130 140 150 160 170180190Time (days)If the initial sample is 3.25 g, what mass of the original iridium-192 remains after 150 days?mass remaining:0.813Estimate the half-life of the radioisotope.half-life:75daysHow many days would it take for one-fourth of the sample to decay?37.5time:daysIncorrectSample remaining (%)

To calc the time , we first need to check the percent of iridium remaining after one-fourth decay.…

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How many days would it take for one-fourth of the sample to decay? 37.5 days time: Incorrect

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

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 3.25 g, what mass of the original iridium-192 remains after 150 days?
mass remaining:
0.813
Estimate the half-life of the radioisotope.
half-life:
75
days
How many days would it take for one-fourth of the sample to decay?
37.5
time:
days
Incorrect
Sample remaining (%)

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