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- E 70- 60- 50- 40- 30- 20- 10- 10 20 30 40 50 60 70 80 90 100 L10 120 130 140 150 100 120 INO 190 Time (days) If the initial sample is 2.25 g, what mass of the original iridium-192 remains after 55 days? mass remaining: 1.35 Estimate the half-life of the radioisotope. half-life: 74.6 days How many days would it take for one-fourth of the sample to decay? time: davs (5) Suuu aurs
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- E 70- 60- 50- 40- 30- 20- 10- 10 20 30 40 50 60 70 80 90 100 L10 120 130 140 150 100 120 INO 190 Time (days) If the initial sample is 2.25 g, what mass of the original iridium-192 remains after 55 days? mass remaining: 1.35 Estimate the half-life of the radioisotope. half-life: 74.6 days How many days would it take for one-fourth of the sample to decay? time: davs (5) Suuu aurs
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ISBN:9781305957404
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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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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
A 70-
60-
50-
40.
30-
20-
10
10
20
40
100 110 120 130o 140 150 160 100 I50 190
30
60
70
80
90
Time (days)
If the initial sample is 2.25 g, what mass of the original iridium-192 remains after 55 days?
mass remaining: 1.35
Estimate the half-life of the radioisotope.
half-life:
74.6
days
How many days would it take for one-fourth of the sample to decay?
time:
days
Sample remaining (5)
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