Final answer:
The question asks about the time it takes for the activity of strontium-85 (85Sr) to reduce to 0.100 mCi. Given the half-life of 85Sr and the initial activity, we can use a formula to calculate the time required.
Step-by-step explanation:
The question asks about the time it takes for the activity of strontium-85 (85Sr) to reduce to 0.100 mCi. Given that the half-life of 85Sr is 65 days and a typical patient receives a dose with an activity of 0.10 mCi, we can calculate the time it takes for the activity to decrease to 0.100 mCi.
To do this, we can use the formula:Final activity = Initial activity * (0.5)^(t/half-life)
Where:
Final activity = 0.100 mCi
Initial activity = 0.10 mCi
Half-life = 65 days
t = time in days
By substituting the given values into the formula, we can solve for t to find the time required for the activity to reduce to 0.100 mCi.