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Calculating Half-life

  • Thread starter larianne
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Homework Statement


If a patient is given a radioactive isotope which has a half-life of six days and a biological half-life of ten days, what is the effective half-life for the isotope.


Homework Equations



I know the formula for half-life calculations is T1/2 = 0.693/k

The Attempt at a Solution



I don't know where to start with this. My tutor just briefly went over it. It was a question on a past paper so I just want it covered in case it comes up in my exams.

Any help I'd be grateful. Thanks.
 

Answers and Replies

  • #2
LowlyPion
Homework Helper
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Homework Statement


If a patient is given a radioactive isotope which has a half-life of six days and a biological half-life of ten days, what is the effective half-life for the isotope.

Homework Equations



I know the formula for half-life calculations is T1/2 = 0.693/k

The Attempt at a Solution



I don't know where to start with this. My tutor just briefly went over it. It was a question on a past paper so I just want it covered in case it comes up in my exams.

Any help I'd be grateful. Thanks.
For what you are asking I think it works something like this:

N = No*e-t/T1*e-t/T2 = No*e-t/T1+t/T2 = No*et/T

Where 1/T = 1/T1 + 1/T2
 
Last edited:

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