Ed University of Kentucky C... X http:// 0%20 days %3 X C Chegg Study I Guided S

Question

Ed University of Kentucky C... X http:// 0%20 days %3 X C Chegg Study I Guided Sol pling 8/2/2016 11:55 PM A 83.7/100 7/30/2016 08:56 PM Gradeb Attempts Score dic Tab Print Calculator 97 Questi 3 of 14 Map 98 Univer Physics presented by Sapling Learning 00 Iodine-125 (25) s used to treat, among other things, brain tumors and prostate cance It decays by 00 medical statements from the hospital verifying such treatment because their radiation could set o radiation detectors at airports. 00 If the initial decay rate (or activity) was 537 uCi, what will the rate be after 369.0 days? 80 Numb 00 00 How many months after the treatment will the decay rate be reduced to 11.5% of the original value? Assume months of 30 days. 00 97 months 00 00 Previous Give Up & View Solution Check Answer Next Exit P Assignment Information Available From: 2016 06:00 PM 8/2/2016 11:55 PM Due Date: Points Possible: 100 Grade Category: Homework Description: Policies: heck y quest keep try h q gh 5% of in your question for each incorrect attempt at that O eTextbook O Help With This Topic Web Help & Videos o Technical Support and Bug Reports 2:55 PM a

Explanation / Answer

t1/2 = 0.693/K
K = 0.693/54.9 = 0.0126 day^-1
K = 2.303/tlog(a0/at)
0.0126 = 2.303/369*log(537/at)
at decay rate = 5.142 micro curie
K = 2.303/tlog(a0/at)
0.0126 = 2.303/tlog(x/((11.5/100)*x))
t = 171.683 days
t = 171.683/30 month = 5.7227 months

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