A scientist finds a fossilized bone and wants to estimate its age. The most suitable method involves measuring the decay of a radioactive isotope that naturally exists in living organisms and decreases after death. Which isotope is mainly used in this method?

Carbon dating is based on the principle that:

A dead plant sample shows very low Carbon-14 content. This indicates that:

In carbon dating, scientists measure the remaining amount of Carbon-14. The main reason this method works is:

Which statement best describes the role of isotopes in medicine?

A patient is injected with a small amount of radioactive tracer to observe blood flow in the brain. This technique is called:

Which property makes isotopes useful in medical imaging?

In a hospital, Technetium-99m (Tc-99m) is commonly used because it:

A fossil is tested and found to contain very little radioactive carbon. What conclusion is most accurate?

Which isotope is most commonly used to study thyroid gland disorders?

The half-life of Carbon-14 is approximately:

In medical imaging, isotopes are used mainly because they:

A living tree contains Carbon-14, but a dead tree trunk does not show the same level. This difference is because:

Which of the following best explains why isotopes are suitable for tracing biological processes?

A doctor wants to detect a tumor inside a patient without surgery. The best method involves:

Which statement correctly connects isotopes with archaeology?

Why is Carbon-14 not used for dating very old rocks (millions of years old)?

The effectiveness of isotopes in medical imaging depends on:

A key advantage of using isotopes in medicine is that they:

Carbon dating becomes less accurate for extremely recent samples because: