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سوال بعدی
Thyroxine labeled with (131)I 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
(A) 2.0 days
(B) 3.2 days
(C) 4.0 days
(D) 4.8 days
(E) 16.0 days