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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.

If the initial sample is 6.25


6.25 g,

 what mass of the original iridium‑192 remains after 80



mass remaining:



Estimate the half‑life of the radioisotope.




How many days would it take for two‑thirds of the sample to decay?



Top Answer

(A) If the initial sample is6.25 g, 2.94 g mass of the original... View the full answer


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