Physics for IGCSE & O level - Atoms And Radioactivity (Section 3 - No. 26)
The half-life of Iodine-131 is 8 days. How long will it take for the activity of a sample to reduce to 1/4 of its original value?
4 days
8 days
16 days
32 days
Explanation
After one half-life, it will be half, after two half-lives, it will be quarter (1/2 * 1/2 = 1/4), thus 8 * 2 = 16 days
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