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Which of the following radioactive isotope is used in the detection of thyroid cancer?

1. Iodine-131
2. Carbon-14
3. Uranium-238
4. Phosphorus-32

Correct answer: Iodine-131

Solution

Iodine-131 is taken up by the thyroid gland because the thyroid uses iodine to make hormones. That makes it useful for detecting thyroid abnormalities, including thyroid cancer.

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