Question

CCT -8 questions 16 and 17 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

Question 17:-

A radioactive substance Technetium-99 is also used by physicians to examine blood flow to

specific organs and assess organ function or bone growth. It has a very short half-life of about 6

hours. The fraction of this material that would remain after 30 hours will be-

a) 1/32

b) 1/5

c) 1/2

d) 4/5
​

Answer 1

Answer:

question 17 -answer : option c

question 16 -answer:option A

Step-by-step explanation:

I think helpful to you

this correct answer

Answer 2

16. a) 10 am

17. c) 1/2

HAVE A NICE DAY !!