Chapter 3 Dental X-Ray Machine

Front 1

What are the 3 main components of a dental x-ray machine?

Back 1

Control panel

Extension Arm

Tube Head

Front 2

What part of the dental machine controls the regulating devices

Back 2

Control Panel

Front 3

Which part of the dental machine enables the tube head to be positioned

Back 3

Extension Arm

Front 4

Which part of the x-ray machine Contains the x-ray tube from which x-rays are generated

Back 4

Tube Head

Front 5

Millampere selector (mA) measures what?

Back 5

the amount of current passing through the wires of the circuit

Front 6

Kilovot Peak selector (kVp) measures what?

Back 6

the difference in potential or voltage across the x-ray tube

Front 7

The kilovolt (kVp) determines what?

Back 7

The speed of electrons traveling toward the target on the anode (penetrating ability of the x-rays produced)

Front 8

The Timer on the controls does what?

Back 8

regulate the duration of the interval that the current will pass through the x-ray tube

Front 9

What are the 3 conditions that are necessary for the production of x-rays?

Back 9

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

Front 10

What is the purpose of a cathode?

Back 10

is to supply the electrons necessary to produce x-rays

Front 11

What are the parts of the cathode? (4)

Back 11

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

Front 12

which part of the cathode is a thin spiral filament?

Back 12

Tungsten Wire

Front 13

What function of the cathode is it when the filament wire is heated to incandescence (red hot and glowing) produces electrons.

Back 13

Thermionic Emission

Front 14

When the wire filament of the cathode is recessed into a molybdenum focusing cusp what does it do?

Back 14

directs the electrons toward the target on the anode

Front 15

how many impulses are there in a second

Back 15

60 impulses in a second (1/60th of a second)

Front 16

A cathode is a positive or negative electrode?

Back 16

Negative

Front 17

What is the purpose of an Anode?

Back 17

To provide the target to stop or significantly slow the high velocity electrons, converting their kinetic energy into x-rays

Front 18

What are the parts and functions of the anode?

Back 18

1. Consists of copper bar with a tungsten plate

2. Target (Tungsten plate)

3. Primary beam

4. Focal spot

Front 19

What does the function of the primary beam of the anode do?

Back 19

The one direction the angle directs most of the x-rays produced

Front 20

What is the Focal spot of the anode?

Back 20

Small rectangular area on the target of the anode to which the focusing cup directs the electron beam

Front 21

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

Back 21

Anode

Front 22

What does the transformer do?

Back 22

an electromagnetic device for changing the current coming into the dental x-ray maching

Front 23

Where are the step up and step down transformers located?

Back 23

In the Tube Head

Front 24

Does the step up or step down transformer decrease the voltage from the wall outlet?

Back 24

Step Down Transformer