Question

Fluorine-18 is a radioactive isotope of fluorine that is used in medical imaging scans. It has a

half-life of approximately 110 minutes. If a patient has a medical imaging scan using an

injection of fluorine-18 at 9 am, at what time will there be less than 25% of the radioactive

isotope in her body?​

Answer 1

Answer:

s used. For example, fluorine-18 labelled fluorodeoxyglucose, also called FDG, is a radioactive version of the sugar glucose (the isotope of fluorine is tagged

Answer 2

Answer:

Answer:

Time at which concentration is less than 25% = After 12:40 pm

Explanation:

Given:

Half life of the reaction = 110 mins

Time at which the injection was given = 9 am

To Find:

The time at which the concentration becomes less than 25%

Solution:

Since this is an example of a radioactive decay, this is a first order reaction.

First finding the rate constant k,