iodine 131

iodine 131

noun Chemistry.
a radioactive isotope of iodine having a mass number 131 and a half-life of 8.6 days, used in the diagnosis and treatment of disorders of the thyroid gland.
Compare radioiodine.
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Iodine 131 is always a great word to know.
So is heterogeneous. Does it mean:
any saline or salty solution
a mixture composed of different substances or the same substance in different phases, such as solid ice and liquid water
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