Various types of cancer are treated by_________________?
Correct answer: A. Cobalt-60
- A. Cobalt-60
- B. Strontium-90
- C. Carbon-14
- D. Nickel-63
Explanation
Cobalt-60 emits penetrating gamma rays, which can be directed at tumours in radiotherapy to damage cancer-cell DNA. Strontium-90 is mainly a beta source, while carbon-14 and nickel-63 are not the standard source named for deep cancer treatment. The likely trap is option b, confusing any medical radioactive isotope with the gamma source used in radiotherapy.
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About Biological and Medical Uses of Radiation
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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