Radiation safety and radiobiology: contamination survey meter: 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 · Radiation safety and radiobiology: contamination survey meter

Sample item

After a small spill of radioiodine in the nuclear medicine laboratory, which instrument is used to survey the bench and floor for contamination?

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

The answer and the reasoning

C. Geiger-Muller survey meter

A Geiger-Muller counter gives a quick audible and numerical response to ionising radiation and is used to monitor surfaces and hands. Personal dosimeters record the dose to a person over time, and a dose calibrator measures the activity in a vial or syringe.

Option by option

  • A. Film badge

    Film badges give cumulative personal dose and cannot find a spill.

  • B. Dose calibrator

    A dose calibrator measures the activity of a prepared dose in a well and is not for area survey.

  • C. Geiger-Muller survey meter (correct)

    Correct. A GM survey meter detects surface contamination quickly.

  • D. Thermoluminescent ring dosimeter

    A ring dosimeter records the dose to the fingers and does not survey surfaces.

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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Questions about this Radiology question

What is the answer to this Radiology question?

The best answer is C, Geiger-Muller survey meter. A Geiger-Muller counter gives a quick audible and numerical response to ionising radiation and is used to monitor surfaces and hands.

Why is "Film badge" not the answer?

Film badges give cumulative personal dose and cannot find a spill.

Why is "Dose calibrator" not the answer?

A dose calibrator measures the activity of a prepared dose in a well and is not for area survey.

Why is "Thermoluminescent ring dosimeter" not the answer?

A ring dosimeter records the dose to the fingers and does not survey surfaces.

What concept does this question test?

It tests Radiation safety and radiobiology: contamination survey meter in Radiology. Personal dosimeters record the dose to a person over time, and a dose calibrator measures the activity in a vial or syringe.

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 Radiation safety and radiobiology: contamination survey meter?

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.