Chapter 5 post lecture Adaptive Follo Problem 5.47 Clinical Application Problem

Question

Chapter 5 post lecture Adaptive Follo Problem 5.47 Clinical Application Problem 5.47 Clinical Application As part of her nuclear stress test, Simone starts to walk on the treadmill. When she reaches the maximum level, Paul injects an radioactive dye with Tl 201 with an activity of 73 MBq The radiation emitted from areas of heart is detected by a scanner and produces images of her heart muscle After Simone rests for 3 h, Paulinjects more dye with Tl 201 and she is placed under the scanner again. A second set of images of her heart muscle at rest are taken. When Simone's doctor reviews her scans, he assures her that she had normal blood flow to her heart muscle, both at rest and under stress

Explanation / Answer

A/Ao = 1/16
after each half life activity is reduced by half

so, number of half life n can be calculated as
(1/2)^n = A/Ao
(1/2)^n = 1/16
n=4

it takes 4 half lifes

number of days = 4*3.0 = 12 days

Answer: 12 days

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