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# The half-life of iodine is 8 days. A doctor administers a 12 unit treatment to a patient. What is the exponential decay equation to find how much iodine

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The half-life of iodine is 8 days. A doctor administers a 12 unit treatment to a patient. What is the exponential decay equation to find how much iodine is left in the patient after 24 days?

Guest Mar 1, 2017
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#1
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R= 12 x 2^(-24/8), where R =Remainder.

R= 12 x 2^-3

R =12 x 1/8

R = 1.5 units of iodine after 24 days.

Guest Mar 1, 2017
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I like the way you did that, Guest........way easier than solving logs......I'm adding that to my bag of "tricks"

CPhill  Mar 1, 2017
#3
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Cphill: Thanks for the compliment. I had shown previously that this simple method is equivalent to the logs' method.

Guest Mar 1, 2017

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