Chapters 8 & 9 Flashcards
What is needed to push electrons from the cathode to the anode?
High voltage
The step up transformer is located in what part of the x-ray circuit?
Main x-ray circuit
Which part of the circuit increases the voltage to a known quality?
Compensation circuit
Which part of the circuit increases the voltage
Step-up transformer
What is the purpose of the rectifier?
Changing AC to DC
What device adjusts the number of electrons?
mA selector
Thermionic Emissions requires?
High number of electrons, low voltage, high resistance
Rotoring activates?
Filament circuit
What is the most common interaction in the anode?
Heat
What anode material is most commonly used in conventional radiography?
Tungsten
The strength of bremsstrahlung-produced x-ray depends on?
How close the incident electron comes to the nucleus
If an incident electron hits the nucleus, what type of interaction occurs?
Bremsstrahlung
If the kVp is set to the 90 and the incident electron slams into the nucleus, what is the resulting power of the x-ray photon?
90 keV
Characteristic x-ray production is the result of an interaction between an?
Incident electron and an orbiting electron
During bremsstrahlung x-ray production, a greater number of strong x-rays are produced than weak ones?
False
If a characteristic cascade occurs in an atom w/4 shells, how many x-rays could be created?
3
In an electric current, how many pulses are generated in one direction if the electricity is @ 60 hertz?
60
AC is needed to?
Adjust the kVp
How many pulses are there in 60 Hz in a full wave rectified DC?
120
When an electric current is rectified?
It is changed from AC to DC
In which of these examples are there times at which there is no electron movement?
Single-phase, half-wave power
Voltage ripple describes?
The fluctuating power of electron movement
Single phase power requires an increase in technique compared w?High Frequency? (T or F)
True
Most x-ray are produced through the ________ process?
Bremsstrahlung
X-ray emission spectrum proves that more x-rays are produced through Bremsstrahlung process than any other interaction? (T or F)
True
Common filter material used in conventional radiography?
Aluminum
The heel effect?
Exists because some x-rays are absorbed by the surface of the anode?
The principle means of heat transfer from the focal spot to the anode is?
Radiation
The line focus principle?
Spreads the heat over a larger part of the anode
The purpose of the cathode focusing cup is to?
Group electrons for their passage to the anode
A molybdenum shaft is used to connect the anode to the rotor because?
It is a less dense metal with high melting point
The principle means of heat transfer from the anode to the housing is?
Radiation
The boost current in a filament?
Raises the filament to its operating temp.
An increase in target angle will increase the heat capacity? (T or F)
T
An increase in focal spot size will increase the heat capacity of the tube? (T or F)
T
An increase in anode rotation speed will increase the heat capacity of the tube? (T or F)
T
The transfer of heat by ________ is increase by mounting a fan on the tube housing?
Convention
The principle means of heat transfer from the tube housing to the room is?
Convention
The heel effect is more pronounced?
With a smaller SID
The disadvantage of a small target angle is?
Greater anode heel effect
Thermionic emission is the emission of?
Electrons from the heated cathode
The tube current (mA) is changed by changing the?
Filament current
