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.100-90-80-8 70-60-5040-30-2010102030405060708090100 110 120130 140 1500 160170180 190Time (days)Sample remaining (%) If the initial sample is 8.00 g, what mass of the original iridium-192 remains after 105 days?0.675mass remaining:IncorrectEstimate the half-life of the radioisotope.half-life:72daysHow many days would it take for one-fourth of the sample to decay?114daystime:

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If the initial sample is 8.00 g, what mass of the original iridium-192 remains after 105 days? 0.675 mass remaining: Incorrect Estimate the half-life of the radioisotope. half-life: 72 days How many days would it take for one-fourth of the sample to decay? 114 days time:

If the initial sample is 8.00 g, what mass of the original iridium-192 remains after 105 days? 0.675 mass remaining: Incorrect Estimate the half-life of the radioisotope. half-life: 72 days How many days would it take for one-fourth of the sample to decay? 114 days time:

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-
8 70-
60-
50
40-
30-
20
10
10
20
30
40
50
60
70
80
90
100 110 120
130 140 1500 160
170
180 190
Time (days)
Sample remaining (%)

If the initial sample is 8.00 g, what mass of the original iridium-192 remains after 105 days?
0.675
mass remaining:
Incorrect
Estimate the half-life of the radioisotope.
half-life:
72
days
How many days would it take for one-fourth of the sample to decay?
114
days
time:

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