Macmillan Learning 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. Sample remaining (%) 100 80- 70- 60- 50 40- time: 30- 20. 30 50 60) 70 80 90 100 110 120 130 140 150 160 170 180 190 Time Idays) If the initial sample is 8.00 g. what mass of the original iridium-192 remains after 55 days? 0 mass remaining: 10 20 30 Estimate the half-life of the radioisotope. half-life: How many days would it take for two-thirds of the sample to decay? days days
Macmillan Learning 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. Sample remaining (%) 100 80- 70- 60- 50 40- time: 30- 20. 30 50 60) 70 80 90 100 110 120 130 140 150 160 170 180 190 Time Idays) If the initial sample is 8.00 g. what mass of the original iridium-192 remains after 55 days? 0 mass remaining: 10 20 30 Estimate the half-life of the radioisotope. half-life: How many days would it take for two-thirds of the sample to decay? days days
Chapter10: Radioactivity And Nuclear Processes
Section: Chapter Questions
Problem 10.51E
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Transcribed Image Text:Macmillan Learning
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.
Sample remaining (9)
100
90
70
50-
10
20-
0
time:
10 20 30 10
mass remaining:
half-life:
3
70
If the initial sample is 8.00 g. what mass of the original iridium-192 remains after 55 days?
Estimate the half-life of the radioisotope.
80 90 100 110 120 130 140 150 160 170 180 190
Time Idays)
How many days would it take for two-thirds of the sample to decay?
B
days
days
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