A patient is treated with 128 mCi (millicuries) of iodine- 131 131 I . The radioactivity level R t (in mCi) after t days is given by R t = 128 2 − t / 4.2 . (In this model, the value 4.2 is related to the biological half-life of radioactive iodine in the body.) a. Determine the radioactivity level of 131 I in the body after 6 days. Round to the nearest whole unit. b. Evaluate R 4.2 and interpret its meaning in the context of this problem. c. After how many half-lives will the radioactivity level be 16 mCi?
A patient is treated with 128 mCi (millicuries) of iodine- 131 131 I . The radioactivity level R t (in mCi) after t days is given by R t = 128 2 − t / 4.2 . (In this model, the value 4.2 is related to the biological half-life of radioactive iodine in the body.) a. Determine the radioactivity level of 131 I in the body after 6 days. Round to the nearest whole unit. b. Evaluate R 4.2 and interpret its meaning in the context of this problem. c. After how many half-lives will the radioactivity level be 16 mCi?
A patient is treated with 128 mCi (millicuries) of
iodine-
131
131
I
.
The radioactivity level
R
t
(in mCi) after
t
days is given by
R
t
=
128
2
−
t
/
4.2
.
(In this model, the value 4.2 is related to the biological half-life of radioactive iodine in the body.)
a. Determine the radioactivity level of
131
I
in the body after 6 days. Round to the nearest whole unit.
b. Evaluate
R
4.2
and interpret its meaning in the context of this problem.
c. After how many half-lives will the radioactivity level be 16 mCi?
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