The noble gas which is used in radiotherapy of cancer is
Correct answer: A. Radon
- A. Radon
- B. Xenon
- C. Krypton
- D. Argon
Explanation
A is correct as radan has radioactive tendencies and is used as radiation therapy for cancer patients.The alpha particles emitted by the radon have the capacity to kill the cells (localized) of cancer, hence it is used in the treatment of various types of cancer (liver cancer, intestine cancer)B is incorrect as xenon is used in bactericidal lamps.C is incorrect as krypton is used for other purposes (filling fluorescent lights etc)D is incorrect as Argon is used in Geiger counter and light bulbs
This question appeared on the UHS MDCAT 2010 paper, which you can sit online with every answer explained.
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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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