Physics Nuclear Physics ETEA 2019
PMDC Verified Question 55 of 98
While using radiation therapy, cancerous thyroid is treated with ____ radioisotope:
A
Carbon
B
\(^{235}\text{uranium}\)
C
Thorium
D
Iodine-131
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Iodine-131


Concept:

Medical radioisotopes are selected based on the specific metabolic properties of organs in the human body.

Solution:

  • The human thyroid gland naturally and actively absorbs and concentrates circulating iodine to synthesize thyroid hormones.


  • By administering the radioactive isotope Iodine-131, the thyroid rapidly absorbs it.


  • The I-131 then undergoes beta decay directly inside the tumor, emitting highly localized radiation that destroys the cancerous thyroid cells without heavily damaging distant tissues.


Why other options are incorrect:

Carbon-14 is used for radiocarbon dating. Uranium and Thorium are highly toxic heavy metals used for nuclear power and strictly not used in human bodies.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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