Environmentalhard · Past Paper
Which radioactive isotope is a major concern following a nuclear reactor accident due to its accumulation in the thyroid gland?
ACarbon-14
BIodine-131
CUranium-238
DRadon-222
✓ Correct Answer: B — Iodine-131
Iodine-131 is readily absorbed by the thyroid and can cause thyroid cancer; it is a major fission product.
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