Radiotherapy and nuclear medicine basics: molybdenum breakthrough: practice question

A Radiology question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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Radiology · Radiotherapy and nuclear medicine basics: molybdenum breakthrough

Sample item

A radiopharmacist tests the eluate of a technetium generator for the long-lived parent radionuclide. Which test is this?

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

D. Molybdenum breakthrough test

Molybdenum-99 breakthrough in the eluate raises patient dose and degrades images because its half-life is much longer and its photons more energetic than those of Tc-99m. The permitted limit is set by pharmacopoeial standards.

Option by option

  • A. Radiochemical purity test

    A radiochemical purity test measures the fraction of Tc-99m in the desired chemical form.

  • B. Sterility test

    A sterility test checks for microbial contamination, not parent radionuclide content.

  • C. Aluminium breakthrough test

    Aluminium breakthrough measures alumina released from the generator column, which interferes with labelling.

  • D. Molybdenum breakthrough test (correct)

    Correct. The molybdenum breakthrough test measures the parent contaminant in the eluate.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

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What is the answer to this Radiology question?

The best answer is D, Molybdenum breakthrough test. Molybdenum-99 breakthrough in the eluate raises patient dose and degrades images because its half-life is much longer and its photons more energetic than those of Tc-99m.

Why is "Radiochemical purity test" not the answer?

A radiochemical purity test measures the fraction of Tc-99m in the desired chemical form.

Why is "Sterility test" not the answer?

A sterility test checks for microbial contamination, not parent radionuclide content.

Why is "Aluminium breakthrough test" not the answer?

Aluminium breakthrough measures alumina released from the generator column, which interferes with labelling.

What concept does this question test?

It tests Radiotherapy and nuclear medicine basics: molybdenum breakthrough in Radiology. The permitted limit is set by pharmacopoeial standards.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study Radiotherapy and nuclear medicine basics: molybdenum breakthrough?

Learn signs with the image, and the disease they point to. Then use the flashcards and the other Radiology questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.