iridium-192 is one ra 12/2/2016 06:00 PM 72.8/100 Gradebook e Print i Calculator
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iridium-192 is one ra 12/2/2016 06:00 PM 72.8/100 Gradebook e Print i Calculator Periodic Table Question 15 of 19 Iridium-192 is one radioisotope used in brachytherapy, in which a radioactive source is placed inside a Map 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. Sample remaining 0 10 20 30 40 500 60 70 80 900 100 110 120 130 140 150 160 1 70 180 190 200 Time (days) a) If the initial sample is 8.75 g, what mass of the original iridium-192 remains after 5 days? Number continued below. A O Previous ® Give Up & View solution check Answer Next a Exit HintExplanation / Answer
According the graph , after 5 days 95% of the compound is remained.
Amount of compound remained after 5days = 8.75*95% = 8.31 gm
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Half life of a radioactive compound is the time passed when concentration of a compound is reduced to half of its initial amount. According to this graph, compound breaks down from 100% to 50% in 70days. So, the half life of the compound is 70 days.
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If two third of the compound decays, then 1/3 of the compound is remaining.
1/3 compound = 33.33 %
In this graph 33.33 % corresponds to 110 days. So, it will take 110days to reduce to 1/3 of the original concentration.
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