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What percentage of radioactivity remains for I-131 after 4 half lives? What percentage of radioactivity remains for Iridium 192 after 73.8 days? A source of

What percentage of radioactivity remains for I-131 after 4 half lives?

What percentage of radioactivity remains for Iridium 192 after 73.8 days?

A source of Iodine 131 starts with an activity of 200 mCi. What is the activity after 8 days?

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