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. Sample remaining (%) a) If the initial sample is 2.25 g, what mass of the original iridium -192 remains after 5 days?

Explanation / Answer

a)

from the graph percentage of the sample after 5 days is 95%

the mass of initial sample = 2.25 g

mass of original = 95% x mass of initial

= 95/100 x 2.25

= 2.14 g

mass of original = 2.14 g

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