Iodine 131 has a half-life of 8.0 days.An I-131 sample has an initial activity of 32 mCi.What is the activity after 24 days?

Question

Quizplus · Accepted Answer

We can use the radioactive decay formula to solve this problem:

A = A₀(1/2)^(t/T)

where:
A = final activity
A₀ = initial activity
t = time elapsed
T = half-life

Plugging in the values given in the problem, we get:

A = 32 mCi x (1/2)^(24/8)
A = 4.0 mCi

Therefore, the activity of the I-131 sample after 24 days is 4.0 mCi. The correct answer is D).

Iodine 131 Has a Half-Life of 8