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# Radioactivity; Activity and Half-life

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3. The half-life of iodine-131, an isotope used in the treatment of thyroid disorders, is 8.04 d.

(a) If a sample of iodine-131 contains 5.0 1016 nuclei, what is the activity of the sample? Express your answer in curies.
(b) If the half-life of iodine-131 were only one-fifth of its actual value, calculate the factor by which the activity of this sample would change.

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Please see the attached file.

3. The half-life of iodine-131, an isotope used in the treatment of thyroid disorders, is 8.04 d.
(a) If a sample of iodine-131 contains 5.0 1016 nuclei, what is the activity of the sample? Express your answer in curies.
(b) If the half-life of iodine-131 were only one-fifth of its actual value, calculate the factor by which the activity of this sample would change.
For part A, I tried using the relationship T1/2 = ln2/Î» and R = N0Î», but still couldn't ...

#### Solution Summary

The expert examines activity in Curie of a sample is calculated. The relation between activity and half-line is determined.

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