Nuclear medicine often uses radioactive samples as a tracer to monitor processes inside the body. Suppose a nuclear reactor makes a certain isotope sample with an initial activity of 147 mCi, and the sample gets delivered to a hospital 14.0 hours later, when its activity has become 56.0 mCi. Luckily, the sample remains usable until its activity drops below 12.9 mCi. How long after the delivery is this sample usable? Submit Answer Tries 0/2

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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- 8 70- 60- 50 40- 30- 20 10 10 20 30 40 50 60 70 80 90 100 110 120 130 140 1500 160 170 180 190 Time (days) Sample remaining (%)

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