Dental materials and radiology: radiation protection: practice question

A Dentistry 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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Dentistry · Dental materials and radiology: radiation protection

Sample item

Which measure is part of the ALARA principle in dental radiography?

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

The answer and the reasoning

D. Use rectangular collimation, fast film and thyroid collar

ALARA means as low as reasonably achievable, so radiographs are justified, collimated and made with fast receptors. Thyroid collars and aprons add protection.

Option by option

  • A. Avoid a lead apron for children

    Shielding is recommended for children.

  • B. Take repeat films routinely

    Repeating films increases dose.

  • C. Use the longest possible exposure times

    Longer exposures raise dose.

  • D. Use rectangular collimation, fast film and thyroid collar (correct)

    Correct. These measures cut the dose.

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 Dentistry question

What is the answer to this Dentistry question?

The best answer is D, Use rectangular collimation, fast film and thyroid collar. ALARA means as low as reasonably achievable, so radiographs are justified, collimated and made with fast receptors.

Why is "Avoid a lead apron for children" not the answer?

Shielding is recommended for children.

Why is "Take repeat films routinely" not the answer?

Repeating films increases dose.

Why is "Use the longest possible exposure times" not the answer?

Longer exposures raise dose.

What concept does this question test?

It tests Dental materials and radiology: radiation protection in Dentistry. Thyroid collars and aprons add protection.

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 Dental materials and radiology: radiation protection?

Learn the dental formula, eruption ages and tooth structure once, as tables. Then use the flashcards and the other Dentistry 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.