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What is the half-life of the radioactive isotopes?a. A radioactive isotope decreased to one-half its original amount in 18 months.
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What is the half-life of the radioactive isotopes?a. A radioactive isotope decreased to one-half its original amount in 18 months.

User Arni
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One fourth means (one half) of (one half) .

So the 18 months must be two half-lifes.

The half-life of this particular isotope is 9 months.
User Shy Agam
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