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 patient's body to treat cancer. Brachy in brachytherapy, in which a radioactive source is placed inside a therapy 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 Answer the following three questions (a, b, and c) based on the radioactive decay curve of iridium- shown below. Click on the graph and move the mouse over a point to get values for that point. Sample remaining (%) 100 90 10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 Time (days) a) If the initial sample is 9.00 g, what mass of the original iridium-192 remains after 65 days? continued below... Number Exit Previous Give Up & View Solution O check Answer 0 Next Hint

Explanation / Answer

(a).

From the graph, it is clearly seen that
At 65 days there is 55% of the sample remaining.

Initial mass of Iridium-192 = 9.00 g

So, mass of Iridium-192 after 65 days is 55% of 9.00 g

= (55 / 100) x 9.00 g
= 0.55 x 9.00 g
= 4.95 g

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