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 Iodine needs help please :/

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Hello, 

 

Iodine-131 , which has a half life of 8 days, is used to helpt see the thyroid gland in CT scans. If a patient is given an injection of 10 micrograms, then the nhumber of micrograms in the body t days afterthe injection is given by : 

 

A(t) = 10(1-2) ^t/8. What is the amount in the person's body after 5 days ? Round to the nearest tenth of a microgram ? 

 

 

Please someone help me :( I try to figure it out alone  but I can't ! 

 

Thank you so much 

 
 Nov 7, 2015

3+0 Answers

 #1
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0

I know t = 0 right ? 

 

So do I HAVE TO PLUG 0 for T and then calculate ? 

 

Thank you 

 
 Nov 7, 2015
 #2
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deleted

Thanks Alan. :)

 Nov 8, 2015
edited by Melody  Nov 8, 2015
 #3
avatar+33663 
+5

I think this should be A(t) = 10e-ln(2)*t/8

 

After 5 days  A(5) = 10e-ln(2)*5/8 ≈ 6.5 micrograms

.

 Nov 8, 2015

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