MCQ practice · SSC Chemistry Board questions · Chapter 3: Structure of Matter
Which isotope is used to destroy thyroid cancer cells?
Think it through first, then pick an option.
- a ⁶⁰Co
- b ³²P
- c ¹³¹I
- d ⁹⁹Tc
Answer and explanation
Correct answer: c ¹³¹I
A ¹³¹I-rich solution reaches the thyroid and kills cancer cells with beta rays.
Why the other options are wrong
- a ⁶⁰Co: ⁶⁰Co is for tumours; the thyroid one is ¹³¹I.
- b ³²P: ³²P is for leukaemia; thyroid cancer is treated with ¹³¹I.
- d ⁹⁹Tc: ⁹⁹Tc takes pictures for diagnosis, it does not treat; the answer is ¹³¹I.
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