BDA RADIOGRAPHY AND RADIOLOGY TEST
PAPER QUESTIONS AND SOLUTIONS 2026
GRADED A+
◉ What x-ray set variable affects the degree of blackening of the
radiographic image? Answer: mA - mA controls the quantity of x-ray
photons in the beam. The more photons hit the image receptor, the more
blackening of the final image.
◉ Why must we use a shield when the x-ray beam is pointed at the
patient's thyroid gland? Answer: The thyroid gland is particularly
sensitive to radiation damage - Thyroid tissue is sensitive to radiation
damage, so it should be protected from direct exposure wherever
possible.
◉ What is the annual, recommended dose constraint for dental staff
involved in radiography? Answer: 0.3mSv - While 20mSv/year is the
IRR17 maximum dose limit for non-classified workers, the guidance
notes recommend practices aim for a lower dose constraint of 0.3mSv.
◉ What type of radiograph does not have any geometrical distortion?
Answer: None of the above - All 2D radiographs have a degree of
geometrical distortion to them, no matter if they are digital or film. The
PAPER QUESTIONS AND SOLUTIONS 2026
GRADED A+
◉ What x-ray set variable affects the degree of blackening of the
radiographic image? Answer: mA - mA controls the quantity of x-ray
photons in the beam. The more photons hit the image receptor, the more
blackening of the final image.
◉ Why must we use a shield when the x-ray beam is pointed at the
patient's thyroid gland? Answer: The thyroid gland is particularly
sensitive to radiation damage - Thyroid tissue is sensitive to radiation
damage, so it should be protected from direct exposure wherever
possible.
◉ What is the annual, recommended dose constraint for dental staff
involved in radiography? Answer: 0.3mSv - While 20mSv/year is the
IRR17 maximum dose limit for non-classified workers, the guidance
notes recommend practices aim for a lower dose constraint of 0.3mSv.
◉ What type of radiograph does not have any geometrical distortion?
Answer: None of the above - All 2D radiographs have a degree of
geometrical distortion to them, no matter if they are digital or film. The
