Question detail
What is a key reason for using gamma emitters as medical tracers?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Hazards and uses of radioactive emissions and of background radiation
Question
- A. They have a very long half-life
- B. They are highly ionizing
- C. They penetrate tissues well
- D. They are easily absorbed by the body
Answer
The correct answer is C: They penetrate tissues well.
Explanation
The correct answer is C: They penetrate tissues well. This supports the learning objective "Explain why medical tracers need suitable half-lives." in Uses of nuclear radiation because it uses the correct atomic and nuclear radiation relationship for Hazards and uses of radioactive emissions and of background radiation. The other options are less suitable because they do not match the required Uses of nuclear radiation idea: They have a very long half-life; They are highly ionizing; They are easily absorbed by the body.
Common mistake
Misunderstanding Half-Lives
Students often confuse the concept of half-life with the total time a radioactive isotope is active, thinking it refers to the entire duration of radioactivity rather than the time taken for half of the radioactive atoms to decay.
To fix this, students should focus on understanding that half-life is a specific time period during which half of the radioactive material decays, and that isotopes can remain active for multiple half-lives.
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