In radiotherapy X-rays are used to:
Correct answer: C. Treat cancer by controIIed exposure
- A. Detect bone fractures
- B. Detect heart diseases
- C. Treat cancer by controIIed exposure
- D. Detect fault in radio receiving circuits
Explanation
In radiotherapy X-rays are used to kill cancer cells. X-rays are a form of high-energy radiation that can damage DNA, the genetic material of cells. When DNA is damaged, the cell can no longer function properly, and it dies.
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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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