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If the initial sample is  1.25 g,  what mass of the original iridium‑192 remains after  65  days? mass remaining: 0.675 g (this is correct, I just need answers to the last two questions) Estimate the half‑life of the radioisotope. half-life:   days  How many days would it take for one‑third of the sample to decay? time:

If the initial sample is  1.25 g,  what mass of the original iridium‑192 remains after  65  days? mass remaining: 0.675 g (this is correct, I just need answers to the last two questions) Estimate the half‑life of the radioisotope. half-life:   days  How many days would it take for one‑third of the sample to decay? time:

Chemistry: The Molecular Science
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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If the initial sample is  1.25 g,  what mass of the original iridium‑192 remains after  65  days?

mass remaining:
0.675 g (this is correct, I just need answers to the last two questions)
Estimate the half‑life of the radioisotope.
half-life:   days 
How many days would it take for one‑third of the sample to decay?
time:

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 90 80 70 60 50 40 30- 20 10. 10 20 30 40 50 60 70 90 100 110 120 130 140 150 160 170 180 190 Time (days) 80
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. Sample remaining (%) 100 90 80 70 60 50 40 30- 20 10. 10 20 30 40 50 60 70 90 100 110 120 130 140 150 160 170 180 190 Time (days) 80
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