SOLUTION: Iodine - 131 is a radioactive isotope used in medicine. Its half-life or decay rate of 50% is 8 day. If a patiend is given 25mg of iodine - 131, how much would be left after 32 day

Algebra ->  Functions -> SOLUTION: Iodine - 131 is a radioactive isotope used in medicine. Its half-life or decay rate of 50% is 8 day. If a patiend is given 25mg of iodine - 131, how much would be left after 32 day      Log On


   

Question 1166002: Iodine - 131 is a radioactive isotope used in medicine. Its half-life or decay rate of 50% is 8 day. If a patiend is given 25mg of iodine - 131, how much would be left after 32 days or half-lives. Identify C,t,r, and the decay factor. Write down the equation you would use and solve.
Answer by ikleyn(52884) About Me  (Show Source):
You can put this solution on YOUR website!
.

32 days are 4 half-life periods.


Therefore, the final amount of the medicine after 32 days will be


    %281%2F2%29%5E4%2A25 = 25%2F16 = 1 9%2F16 mg.    ANSWER

Solved.

Notice that the instructions to the solution in the post go across the educational purpose of the problem.

It is why I did not follow these instructions.


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To learn more on the subject, look into the lesson
    - Radioactive decay problems
in this site.

Also,  you have this free of charge online textbook in ALGEBRA-I in this site
    - ALGEBRA-I - YOUR ONLINE TEXTBOOK.

The referred lesson is the part of this online textbook under the topic "Logarithms".


Save the link to this online textbook together with its description

Free of charge online textbook in ALGEBRA-I
https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson

to your archive and use it when it is needed.