[問題]請問放射元素半衰期的問題
最近在準備考試，有一題關於放射元素的問題，想請知道的人幫我解釋
Thyroxine labeled with I131 is administered to a patient for the
purpose of imaging the thyroid gland. The radioactive half-life
of the isotope is 8 days. The biological half-life (the time required
for half of the compound to be eliminated from the body) is 2 days.
The time at which 3/4 of the original radioactivity will no longer
be detectable in the body is closest to?
答案是 3.2 days.
雖然有答案在手，但我還是不太了解怎麼計算。希望有人可以幫個忙，感恩~~
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