The most useful tracer is_________________?
Correct answer: D. C-14
- A. Sr-90
- B. I-131
- C. CA-41
- D. C-14
Explanation
Carbon-14 is a useful tracer because it behaves chemically like ordinary carbon and can be followed through biological and chemical processes. Iodine-131 is a strong distractor because it is especially useful for tracing and treating thyroid activity, but it is not the generally useful tracer intended here.
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Radiation in medicine includes X-rays and gamma rays for imaging, radioactive tracers for diagnosis, and controlled radiation for destroying cancerous tissue. The topic also covers CT scans, PET imaging, radiotherapy, sterilisation, half-life and dosage, alongside biological damage, shielding and the need to balance diagnostic or therapeutic benefit against exposure.
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