A patient was given a certain amount of iodine-131 as a part of a diagnostic procedure for thyroid…
Chemistry20251.5 marksNumerical
A patient was given a certain amount of iodine-131 as a part of a diagnostic procedure for thyroid disorder. Given that the half-life of radioactive $^{131}\text{I}$ is 8 days, what fraction of the initial $^{131}\text{I}$ would be present in a patient after 32 days if none of it were eliminated through natural body processes?
Answer
Answer
Official answer key
No. of half-lives = 32/8 = 4
Amount left after 4 half-lives = $[A_0]/2^4 = \frac{1}{16}[A_0]$
