Question
Iodine-131
Iodine-131 is a radioactive isotope that is used in medicine to treat hyperthyroidism and thyroid cancer. When administered, these isotopes concentrate in abnormal cells, where their emitted radiation directly destroys or weakens the targeted cells. Use the model below to answer the following questions.
Multiple Choice Question
Iodine-131 has a half life of 8 days. If a patient is administered Iodine-131, how much of the Iodine-131 isotope is remaining in the patient's body after 16 days.
A.
1/2 or 50% of the isotope
B.
1/3 or 33.3% of the isotope
C.
3/4 or 75% of the isotope
D.
1/4 or 25% of the isotope
Iodine-131 is a radioactive isotope that is used in medicine to treat hyperthyroidism and thyroid cancer. When administered, these isotopes concentrate in abnormal cells, where their emitted radiation directly destroys or weakens the targeted cells. Use the model below to answer the following questions.
Multiple Choice Question
Iodine-131 has a half life of 8 days. If a patient is administered Iodine-131, how much of the Iodine-131 isotope is remaining in the patient's body after 16 days.
A.
1/2 or 50% of the isotope
B.
1/3 or 33.3% of the isotope
C.
3/4 or 75% of the isotope
D.
1/4 or 25% of the isotope
Answers
Answered by
GPT-5 mini
D. 1/4 or 25%.
Explanation: 16 days is two half-lives (16/8 = 2), so remaining fraction = (1/2)^2 = 1/4 = 25%.
Explanation: 16 days is two half-lives (16/8 = 2), so remaining fraction = (1/2)^2 = 1/4 = 25%.
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