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Iodine-131 is used to treat thyroid cancer. It decays by beta emission and has a half-life of 8.1 days.

a. Write the balanced nuclear reaction for the decay of Iodine-131.

b. What is the activity (in Ci) of a 2.50 mg sample of the isotope?

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Althea Arnoco
Althea ArnocoLv5
15 Nov 2020

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1. gold-198 is used in the diagnosis of liver problems. the halflife of gold-198 is 2.69 days. If you begin with 2.8ug of this goldisotope, what mass remains after 14 days?

2. iodine-131 is used to treat thyroid cancer. it has a halflife of 8.04days. If you ingest sample of this isotope, how muchtime is required for the activity to decrease to 5% of its originalvalue?


Please answer and explain! Thank you!

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