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The transfer of incident electrons' kinetic energy to the outer-shell electrons causing vibration of the outer-shell electron results in the emission of?
The types of target interaction that occur in the production of xray photons in the diagnostic range are dependent upon?
Incident electron kinetic energy
The energy of a brem photon is?
The difference between the enetering and exiting kinetic energy of the incoming electron
Brem interactions may occur only when the incident electron interacts with?
The force field around the nucleus
Characteristic interactions may occur only when the incident electron interacts with?
An inner shell electron
During a characteristic interaction, the kinetic energy of the incident electron must be _______the electron it knocks from orbit.
Greater than that of
During a characteristic interaction, the dropping of a higher-energy state electron into a lower-energy state hole results in the emission of?
A photon of electromagnetic energy
The energy of a characteristic photon is?
The sum of the binding energy of the outer and inner shells between which the electron dropped
X rays are characterized as?
Both: electromagnetic waves of short wavelength and electromagnetic waves with high frequencies
The emission spectrum of an xray beam from a tungsten anode consists of?
All of the above:
A characterstic spike at 69 keV
A significant portion due to brem interactions
A mixture of brem and characteristic interactions
If uranium(92) were used to produce x-radiation, rather than tungsten?
All of the above:
The K shell binding energy would be greater than with tungsten
The intensity of brems production would be greater
The energy of characteristic photons would be greater than with tungsten
When comparing the xray emission spectrum between beams produced at 70 kVp and 110 kVp?
The 70 kVp beam would demonstrate less brems and higher characteristic spike
When the xray emission spectra between single and three phase generators are compared?
Three phase beams would have a higher average energy
What happens to the efficiency of photon production as kinetic energy of the incident electron increases?
What are the two types of target interactions that occur in the diagnostic range?
Brem and characteristic
What are the determining factors of which interaction will occur?
Electron kinetic energy and binding energy
Why is tungesten used as a target material?
Atomic number, maximum number of similar shell binding energies
The force field of brem interactions causes the incident electron to?
Slow down and change direction
The energy of the xray photon is equal to the difference between the?
Entering and exiting incident photon
In a characteristic interaction, the electron from an outer shell to an inner shell cases an _____to be emitted.
A ________interaction is the energy difference between the binding energy of the outer and inner shellf of the electrons involved.
What interaction will cause the highest energy xray photon?
L shell electron dropping into a K shell hole or a N shell electron dropping into a K shell hole
What is the percentage of Brem and chacteristic radiation when 80-100 kVp is used?
80-90 Brem, 10-20 characteristic
When kVp is changed, what effect does it have on the emission spectrum?
Number of high energy and amplitude
What effect does the abosorbtion of xrays through a filter have on the intensity and the average photon energy?
Decreases the intensity and increases energy
What happens to the beam intensity and average photon energy when generator efficiency increases?
What is a 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
What effect does increasing mAs and kVp have on the total xray emission spectrum?
When mAs is changed, it results in the amplitude of the emission spectrum graph.
When kVp is changed, it results in a change in the number of higher-energy photons, as well as in the amplitude
What is a Brem interaction?
An incident electron interacts with the force field of a nucleus, causing the electron to slow down, thus diverting the electrons course. The electron loses energy and changes course.
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