Question

Unit 4 - Half Life of Radioisotopes
Radioisotopes, are special chemical elements that are produced through the natural decay of
atoms. Exposure to radiation generally is considered harmful to the human body, but
radioisotopes are highly valuable in medicine, particularly in the diagnosis and treatment of
disease. Half-life is the time required for a quantity to reduce to half of its initial value. This
term is commonly used to describe radioactive decay of atoms. Few Radioisotopes have short
half-lives and decay before their emitted radioactivity can cause damage to the patient's body.
For example, if the half-life of a 50.0 gram sample is 3 years, then in 3 years only 25 grams
would remain. During the next 3 years, 12.5 grams would remain and so on.
Question 16:-
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?
a) 10 am
b) 12 pm
c) 1 pm
d) 11 am​

Answer 1

Answer:

I think so 10 am

Step-by-step explanation:

hope it helps you