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.

at 105 days the sample remaining (%) is 37.31%

a) If the initial sample is 1.75 g, what mass of the original iridium-192 remains after 105 days?

Explanation / Answer

As the text says, there is 37.31% left at 105 days later

If we use 1.75 g as 100% then

1.75 * 0.3731 = 0.6529 g are left

mass =  0.6529 g

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