Iridium-192 is one radioisotope used in brachytherapy, in which a radioactive so

Question

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. Answer the following three questions (a, b, and c) based on the radioactive decay curve of iridium-192, shown below. Click on the graph and move the mouse over a point to get values for that point.

Use the graph from here:

https://answers.yahoo.com/question/index?qid=20141114192501AAnuAEH

c) How many days would it take for two-thirds of the sample to decay?

Answer is NOT: 22.5, 49.6

Explanation / Answer

two-thirds of the sample has to decay means the sample remaining is one-third

so one-third of 100 will be 33% sample remaining

From the graph 33% sample will be remained after 110days. Hence it would take 110 days for two-thirds of the sample to decay

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