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- 80- E 70- 60 40- 30- 20 10 70 90 100 1io 120 Lo 140 150 160 th0 1io 190 10 20 30 60 80 Time (days) If the initial sample is 4.75 g, what mass of the original iridium-192 remains after 85 days? () Junumaa aydurg

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Chapter20: Nuclear Chemistry
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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-
70
80 90 100 rio 130 130 140 150 1io 10 I0 10
10
20
30
40
50
60
Time (days)
If the initial sample is 4.75 g. what mass of the original iridium-192 remains after 85 days?
1.58
mass remaining:
Incorrect
Sample remaining ()
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- E 70- 60 50- 40- 30 20- 10- 70 80 90 100 rio 130 130 140 150 1io 10 I0 10 10 20 30 40 50 60 Time (days) If the initial sample is 4.75 g. what mass of the original iridium-192 remains after 85 days? 1.58 mass remaining: Incorrect Sample remaining ()
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