Radiation safety and radiobiology: film badge filters: 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.

Try it

Radiology · Radiation safety and radiobiology: film badge filters

Sample item

A personal monitor contains a photographic film behind filters of different metals and plastic, and the pattern of blackening is used to estimate dose and radiation energy. What is it?

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

The answer and the reasoning

D. Film badge

The filters absorb different amounts of radiation, so the relative density under each reveals the energy and type of radiation as well as the dose. Film badges are cheap but sensitive to heat, humidity and light.

Option by option

  • A. Pocket ionisation chamber

    A pocket chamber gives an instant reading from a charged electrode and does not use film.

  • B. Scintillation survey meter

    A scintillation survey meter measures radiation in the field and is not worn.

  • C. Optically stimulated luminescence dosimeter

    OSL dosimeters use aluminium oxide crystals and not film.

  • D. Film badge (correct)

    Correct. Differential filtration of the film allows estimation of energy and type.

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.

More Radiology questions

Questions about this Radiology question

What is the answer to this Radiology question?

The best answer is D, Film badge. The filters absorb different amounts of radiation, so the relative density under each reveals the energy and type of radiation as well as the dose.

Why is "Pocket ionisation chamber" not the answer?

A pocket chamber gives an instant reading from a charged electrode and does not use film.

Why is "Scintillation survey meter" not the answer?

A scintillation survey meter measures radiation in the field and is not worn.

Why is "Optically stimulated luminescence dosimeter" not the answer?

OSL dosimeters use aluminium oxide crystals and not film.

What concept does this question test?

It tests Radiation safety and radiobiology: film badge filters in Radiology. Film badges are cheap but sensitive to heat, humidity and light.

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: film badge filters?

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.