Question
The radioactive isotope sodium-24 is used as a tracer to measure the rate of flow in an artery or vein. The half life of sodium-24 is 14.9 hours.Suppose that a hospital buys a sample of sodium-24
a. how much of the sample will remain AFTER 48 Hours?
b. How long will it be until one gram remains
a. how much of the sample will remain AFTER 48 Hours?
b. How long will it be until one gram remains
Answers
Reiny
amount left = a (.5)^(t/14.9) , where a is the initial amount, and t is the time in hours
a) sub in t = 48
amount left = a(.5)(48/14.9) = .1072a
= appr 10.72% of what you started with
b) can't be answered since you did not say what they started with.
set 1 = a(.5)^(t/14.9) , (once you know a, you will have to use logs)
a) sub in t = 48
amount left = a(.5)(48/14.9) = .1072a
= appr 10.72% of what you started with
b) can't be answered since you did not say what they started with.
set 1 = a(.5)^(t/14.9) , (once you know a, you will have to use logs)