BU Dental Radiology EXAM With complete
solu on| Updated 2026 | New edi on
What does the x-ray tube contain?
cathode anode and focusing cup
Who discovered what x-rays were?
Wilhelm Conrad Roentgen
Proper es of Xrays
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 emi.ed from the what?
Cathode (-)
X-ray is produced when electrons moving at a high speed hit the tungsten target in a x-ray tube.
True
an assistant may hold the film or sensor in place for the pt during exposure
False
As soon as a film or sensor is placed in a pt's mouth it is considered contaminated?
True
X-rays are ionizing radia on.
True
Bitewings show what?
Crowns and permant fixtures are interporximal surfaces of the teeth.
In the paralleling technique the xray is directed perpendicular to the bisec ng line between the
angle of the long axis of the tooth and the film/sensor
, True, explain.. So when you are parallelling, the angle you make when you are bisec ng is
perpendicular to the angle
Pt;s should be drapped with a led apron prior to any radiographic images?
True
Which if not a safety precau on for taking x-rays?
-Always stand behind an appropriate barrier?
-Never stand in the path of primary radia on
-Never stabilize the tube head during radia on
-If neccessary hold the film in the pt's mouth
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?
True
Nerve cells can be regennerated?
False, No- Dense things like bone can and perm fixtures, restora ons.
Which of these have an infulence on radia on protec on?
-Safe equipment
-Skilled operator
-Lead aprons and thyroid collars
-All of the above
All of the above
primary radia on
travels from source to detector
(useful)
sca.er radia on
changes direc on during passage through intervening med
Leakage radia on
: radia on that originates from the X-ray tube and is not the primary beam.
Filters in an x-ray tube is made of what?
Aluminum
solu on| Updated 2026 | New edi on
What does the x-ray tube contain?
cathode anode and focusing cup
Who discovered what x-rays were?
Wilhelm Conrad Roentgen
Proper es of Xrays
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 emi.ed from the what?
Cathode (-)
X-ray is produced when electrons moving at a high speed hit the tungsten target in a x-ray tube.
True
an assistant may hold the film or sensor in place for the pt during exposure
False
As soon as a film or sensor is placed in a pt's mouth it is considered contaminated?
True
X-rays are ionizing radia on.
True
Bitewings show what?
Crowns and permant fixtures are interporximal surfaces of the teeth.
In the paralleling technique the xray is directed perpendicular to the bisec ng line between the
angle of the long axis of the tooth and the film/sensor
, True, explain.. So when you are parallelling, the angle you make when you are bisec ng is
perpendicular to the angle
Pt;s should be drapped with a led apron prior to any radiographic images?
True
Which if not a safety precau on for taking x-rays?
-Always stand behind an appropriate barrier?
-Never stand in the path of primary radia on
-Never stabilize the tube head during radia on
-If neccessary hold the film in the pt's mouth
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?
True
Nerve cells can be regennerated?
False, No- Dense things like bone can and perm fixtures, restora ons.
Which of these have an infulence on radia on protec on?
-Safe equipment
-Skilled operator
-Lead aprons and thyroid collars
-All of the above
All of the above
primary radia on
travels from source to detector
(useful)
sca.er radia on
changes direc on during passage through intervening med
Leakage radia on
: radia on that originates from the X-ray tube and is not the primary beam.
Filters in an x-ray tube is made of what?
Aluminum
