| NOUN | substance | iodine-131 | heavy radioactive isotope of iodine with a half-life of 8 days |
|---|
| Meaning | Heavy radioactive isotope of iodine with a half-life of 8 days; used in a sodium salt to diagnose thyroid disease and to treat goiter. | |
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| Broader | iodine, iodin, I, atomic number 53 | A nonmetallic element belonging to the halogens |
| radioisotope | A radioactive isotope of an element | |
| Spanish | yodo radiactivo | |
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