BU DENTAL RADIOLOGY FINAL TEST
CORRECT 100%
What does the x-ray tube contain? - ANSWER cathode anode and focusing cup
Who discovered what x-rays were? - ANSWER Wilhelm Conrad Roentgen
In a dental x-ray tube the electrons are emitted from the what? - ANSWER Cathode
X-ray is produced when electrons moving at a high speed hit the tugstnen target in a x-
ray tube. T or F - ANSWER True
an assistant may hold the film or sensor in place for the pt during exposure - ANSWER
False
As soon as a film or sensor is placed in a pt's mouth it is considered contaminated? -
ANSWER True
X-rays are ionizing radiation. - ANSWER True
Bitewings show what? - ANSWER 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 - ANSWER 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? - ANSWER
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 - ANSWER 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? - ANSWER True
Nerve cells can be regennerated? - ANSWER 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 - ANSWER All of the above
The harmful effect of x-rays are caused by what?
-Ionizaiton
-Electromagnetic radiation
-Background radiation
-All of the above - ANSWER All of the above
Overall darkness of a radiograph is called what? - ANSWER Dentsity
Electrons are what - ANSWER Negatively charged
Neutrons are - ANSWER Neutrally charged
Protons are - ANSWER Postively charged
Binding energy is what - ANSWER Force that keeps electrons in their place
What orbit around the nucleus is closest? K or L - ANSWER K
Cathode is waht charge - ANSWER Negative
Anode is what charge - ANSWER Postive
Thermonic emmission happens where - ANSWER Cathode
Xrays are produced when what? - ANSWER Electrons collide with the tungsten target
anode (+).
Xrays are produced when electrons collide with the tungsten target - ANSWER True
at 50-70n kVp: mm - ANSWER 1.5
at above 70 kVp: mm - ANSWER 2.5
Which is better for a tube head? 8 in or 16in and rectangle or round - ANSWER 16 in
and rectangle
Collmation restricts the in maine to be not more then 2.75 inches T or F - ANSWER T
Electrons travel at what speed of light - ANSWER 1/2 the speed
CORRECT 100%
What does the x-ray tube contain? - ANSWER cathode anode and focusing cup
Who discovered what x-rays were? - ANSWER Wilhelm Conrad Roentgen
In a dental x-ray tube the electrons are emitted from the what? - ANSWER Cathode
X-ray is produced when electrons moving at a high speed hit the tugstnen target in a x-
ray tube. T or F - ANSWER True
an assistant may hold the film or sensor in place for the pt during exposure - ANSWER
False
As soon as a film or sensor is placed in a pt's mouth it is considered contaminated? -
ANSWER True
X-rays are ionizing radiation. - ANSWER True
Bitewings show what? - ANSWER 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 - ANSWER 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? - ANSWER
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 - ANSWER 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? - ANSWER True
Nerve cells can be regennerated? - ANSWER 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 - ANSWER All of the above
The harmful effect of x-rays are caused by what?
-Ionizaiton
-Electromagnetic radiation
-Background radiation
-All of the above - ANSWER All of the above
Overall darkness of a radiograph is called what? - ANSWER Dentsity
Electrons are what - ANSWER Negatively charged
Neutrons are - ANSWER Neutrally charged
Protons are - ANSWER Postively charged
Binding energy is what - ANSWER Force that keeps electrons in their place
What orbit around the nucleus is closest? K or L - ANSWER K
Cathode is waht charge - ANSWER Negative
Anode is what charge - ANSWER Postive
Thermonic emmission happens where - ANSWER Cathode
Xrays are produced when what? - ANSWER Electrons collide with the tungsten target
anode (+).
Xrays are produced when electrons collide with the tungsten target - ANSWER True
at 50-70n kVp: mm - ANSWER 1.5
at above 70 kVp: mm - ANSWER 2.5
Which is better for a tube head? 8 in or 16in and rectangle or round - ANSWER 16 in
and rectangle
Collmation restricts the in maine to be not more then 2.75 inches T or F - ANSWER T
Electrons travel at what speed of light - ANSWER 1/2 the speed
