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: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter18: Nuclear Chemistry
Section18.9: Applications Of Radioactivity
Problem 18.15E
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Transcribed Image Text: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 (%)
Transcribed Image Text: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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