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24 Cards in this Set
- Front
- Back
What are the 3 main components of a dental x-ray machine? |
Control panel Extension Arm Tube Head |
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What part of the dental machine controls the regulating devices |
Control Panel |
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Which part of the dental machine enables the tube head to be positioned |
Extension Arm |
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Which part of the x-ray machine Contains the x-ray tube from which x-rays are generated |
Tube Head |
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Millampere selector (mA) measures what? |
the amount of current passing through the wires of the circuit |
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Kilovot Peak selector (kVp) measures what? |
the difference in potential or voltage across the x-ray tube |
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The kilovolt (kVp) determines what? |
The speed of electrons traveling toward the target on the anode (penetrating ability of the x-rays produced) |
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The Timer on the controls does what? |
regulate the duration of the interval that the current will pass through the x-ray tube |
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What are the 3 conditions that are necessary for the production of x-rays? |
1. an available source of free electrons 2. high voltage to impart speed to the electrons 3. Target that is capable of stopping/slowing the electrons |
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What is the purpose of a cathode? |
is to supply the electrons necessary to produce x-rays |
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What are the parts of the cathode? (4) |
1. Tungsten wire 2. Thermionic Emission 3. Released electrons from an electron cloud around the wire 4. wire filament is recessed into a molybdenum focusing cup |
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which part of the cathode is a thin spiral filament? |
Tungsten Wire |
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What function of the cathode is it when the filament wire is heated to incandescence (red hot and glowing) produces electrons. |
Thermionic Emission |
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When the wire filament of the cathode is recessed into a molybdenum focusing cusp what does it do? |
directs the electrons toward the target on the anode |
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how many impulses are there in a second
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60 impulses in a second (1/60th of a second)
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A cathode is a positive or negative electrode? |
Negative |
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What is the purpose of an Anode? |
To provide the target to stop or significantly slow the high velocity electrons, converting their kinetic energy into x-rays |
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What are the parts and functions of the anode? |
1. Consists of copper bar with a tungsten plate 2. Target (Tungsten plate) 3. Primary beam 4. Focal spot |
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What does the function of the primary beam of the anode do? |
The one direction the angle directs most of the x-rays produced |
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What is the Focal spot of the anode? |
Small rectangular area on the target of the anode to which the focusing cup directs the electron beam |
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A cloud of electrons first form around the filament wire of the cathode as the tube warms. When the high-voltage current is applied the electrons are attracted and electrically charged to propel toward the focal spot on the target. WHAT is this process called |
Anode |
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What does the transformer do? |
an electromagnetic device for changing the current coming into the dental x-ray maching |
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Where are the step up and step down transformers located? |
In the Tube Head |
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Does the step up or step down transformer decrease the voltage from the wall outlet? |
Step Down Transformer |