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Chapter 8: x ray production
Terms in this set (33)
Incoming electrons are called
How are incident electrons represented in a diagram?
A solid arrow
The electrons that form the thermionic cloud arrive at the anode target at a speed of:
Half the speed of light
How much of the kinetic energy of incident electrons is converted to x ray?
How much of the kinetic energy from incident electrons is converted to heat?
As kinetic energy from incident electrons increases, the efficiency of photon production:
What are the two types of target interactions that produce x ray photons?
Bremsstrahlung and characteristic
Bremsstrahlung interactions occur when the incident electron interacts with:
The force field of the nucleus
What happens when the incident electrons gets close the nucleus?
Electron slows down and diverts course
What happens to the electron when it's course changes?
Electron loses energy
True or false. The energy that is lost during the braking is emitted as heat.
False. Emitted as an x ray photon.
What is the relationship between distance and kinetic energy lost in brems interactions?
Larger distances = little energy lost
At closer distances, __________ energy is lost.
Brems energies are individually
When do characteristic interactions occur?
when the incident electron interacts with an inner shell electron
The ability of an electron to knock an inner shell electron from orbit is determined by:
The amount of kinetic energy it has
What happens to the inner shell electron during a characteristic interaction?
The electron is knocked from orbit and leaves a hole
In a characteristic interaction, what produces x ray photons?
The energy difference between the two shells that an electron has jumped from
These emissions are called characteristic photons because their energy is:
Exactly the difference between the binding energy of the outer and inner shells where the electron was dropped.
What is the characteristic cascade?
The reaction of electrons dropping into the holes created during a characteristic interaction until there is only a hole in the outer shell
Unlike brems photons, characteristic photons are:
The amount of energy lost by an incident electron is determined by:
Distance from the nucleus
What is the formula for determining how many electrons can occupy a shell?
If an incident electron has 65 keV, will it be able to affect electrons in the K shell which has a binding energy of 69.5?
No, insufficient energy
What is the binding energy for L shell electrons?
Which electron shell produces emissions that comprise our x ray beam?
Most photons are produced by what type of interaction?
Between 80-100 kvp, how much of the primary beam is produced by brems?
True or false: the kvp chosen by the radiographer is the energy utilized for the entire exposure.
False. Kvp is MAX energy
The average primary beam photon has a keV energy of only about
30-40 % of the chosen kvp
When mA, time or mAs is changed, what is the effect on amplitude?
What is the relationship between generator phasing and x ray beam intensity?
As generator efficiency increases, the x ray beam increases in intensity.
What is the binding energy for M shell electrons?
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