BU DENTAL RADIOLOGY ACTUAL EXAM
SCRIPT (LATEST UPDATE 2026) FULL
QUESTIONS AND CORRECT ANSWERS
ALREADY PASSED
What does the x-ray tube contain? -CORRECTANSWER cathode anode and focusing
cup
Who discovered what x-rays were? -CORRECTANSWER Wilhelm Conrad Roentgen
Properties of Xrays -CORRECTANSWER 1. X-rays are weightless package of pure
energy
2. They have no electrical charge
3. They travel at the speed of light
4. They travel in straight line but diverge from a central focus
5. They have enough energy to ionize and cause biological damage
6. They can cause certain substances to fluoresce and affect photographic film.
In a dental x-ray tube the electrons are emitted from the what? -CORRECTANSWER
Cathode (-)
X-ray is produced when electrons moving at a high speed hit the tungsten target in a x-
ray tube. -CORRECTANSWER True
,an assistant may hold the film or sensor in place for the pt during exposure -
CORRECTANSWER False
As soon as a film or sensor is placed in a pt's mouth it is considered contaminated? -
CORRECTANSWER True
X-rays are ionizing radiation. -CORRECTANSWER True
Bitewings show what? -CORRECTANSWER Crowns and permant fixtures are
interporximal surfaces of the teeth.
In the paralleling technique the xray is directed perpendicular to the bisecting line
between the angle of the long axis of the tooth and the film/sensor -
CORRECTANSWER True, explain.. So when you are parallelling, the angle you make
when you are bisecting is perpendicular to the angle
Pt;s should be drapped with a led apron prior to any radiographic images? -
CORRECTANSWER True
Which if not a safety precaution for taking x-rays?
-Always stand behind an appropriate barrier?
-Never stand in the path of primary radiation
, -Never stabilize the tube head during radiation
-If neccessary hold the film in the pt's mouth -CORRECTANSWER If neccessary hold
the film in the pt's mouth, never hold the film or sensor in the pts mouth.
X-rays travel at the speed of light? -CORRECTANSWER True
Nerve cells can be regennerated? -CORRECTANSWER False, No- Dense things like
bone can and perm fixtures, restorations.
Which of these have an infulence on radiation protection?
-Safe equipment
-Skilled operator
-Lead aprons and thyroid collars
-All of the above -CORRECTANSWER All of the above
primary radiation -CORRECTANSWER travels from source to detector
(useful)
scatter radiation -CORRECTANSWER changes direction during passage through
intervening med
Leakage radiation -CORRECTANSWER : radiation that originates from the X-ray tube
and is not the primary beam.
SCRIPT (LATEST UPDATE 2026) FULL
QUESTIONS AND CORRECT ANSWERS
ALREADY PASSED
What does the x-ray tube contain? -CORRECTANSWER cathode anode and focusing
cup
Who discovered what x-rays were? -CORRECTANSWER Wilhelm Conrad Roentgen
Properties of Xrays -CORRECTANSWER 1. X-rays are weightless package of pure
energy
2. They have no electrical charge
3. They travel at the speed of light
4. They travel in straight line but diverge from a central focus
5. They have enough energy to ionize and cause biological damage
6. They can cause certain substances to fluoresce and affect photographic film.
In a dental x-ray tube the electrons are emitted from the what? -CORRECTANSWER
Cathode (-)
X-ray is produced when electrons moving at a high speed hit the tungsten target in a x-
ray tube. -CORRECTANSWER True
,an assistant may hold the film or sensor in place for the pt during exposure -
CORRECTANSWER False
As soon as a film or sensor is placed in a pt's mouth it is considered contaminated? -
CORRECTANSWER True
X-rays are ionizing radiation. -CORRECTANSWER True
Bitewings show what? -CORRECTANSWER Crowns and permant fixtures are
interporximal surfaces of the teeth.
In the paralleling technique the xray is directed perpendicular to the bisecting line
between the angle of the long axis of the tooth and the film/sensor -
CORRECTANSWER True, explain.. So when you are parallelling, the angle you make
when you are bisecting is perpendicular to the angle
Pt;s should be drapped with a led apron prior to any radiographic images? -
CORRECTANSWER True
Which if not a safety precaution for taking x-rays?
-Always stand behind an appropriate barrier?
-Never stand in the path of primary radiation
, -Never stabilize the tube head during radiation
-If neccessary hold the film in the pt's mouth -CORRECTANSWER If neccessary hold
the film in the pt's mouth, never hold the film or sensor in the pts mouth.
X-rays travel at the speed of light? -CORRECTANSWER True
Nerve cells can be regennerated? -CORRECTANSWER False, No- Dense things like
bone can and perm fixtures, restorations.
Which of these have an infulence on radiation protection?
-Safe equipment
-Skilled operator
-Lead aprons and thyroid collars
-All of the above -CORRECTANSWER All of the above
primary radiation -CORRECTANSWER travels from source to detector
(useful)
scatter radiation -CORRECTANSWER changes direction during passage through
intervening med
Leakage radiation -CORRECTANSWER : radiation that originates from the X-ray tube
and is not the primary beam.
