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The radio isotope N-13, which has a half...

The radio isotope N-13, which has a half life of 10 minutes, is used to image organs in the body. If an injected sample has an activity of 40 micro-curies, what is its activity in micro-curies after 25 minutes in the body?

Text Solution

Verified by Experts

The correct Answer is:
7.07
Activity, `A=A_(0)((1)/(2))^(t//t_(1//2))`
`:." "A=40mu Ci((1)/(2))^(25//10)" "implies" "A=(40)/(2^(5//2))mu Ci`
`A=(40)/((sqrt(2))^(5))=(40)/(4sqrt(2))=(10)/(sqrt(2))`
`A=5sqrt(2)mu CiimpliesA=7.07mu Ci`
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