production of xrays review problems

what type of the interaction producted most of the primary xray beam?

brems

what affects the amplitude, or height of the emission spectrum curve?

mAs (directly propotional)

which target interaction produces a cascade effect with predictable xray energy production?

characteristic

how will an increase in kvp affect the spectral emission curve?

shifts to the right

amplitude increases

how much energy must the imcoming electron posses to produce a characteristic tube interaction?

70 kvp

what determines the energy of the photons produced during brems radiation?

-energy of the incident electron

-the charge of the nucleus

-the proximity of the incident electron to the nucleus

the difference in origins of a low energy brems xray and max-energy xray, is that the max energy xray is produced when the incident electron:

gets extremely close to the nucleus

what conditions are necessary for the production of xrays?

source of electron (filament)

accelerating electrons (kvp)

decelerate electrons (target)

what does the term heterogenous mean, as it relates to the xray beam?

contains a varity of energy

what percentage of the kinetic energy of the electrons is converted to xrays?

1%

what happens tot he remainder of the energy, as it relates to the question above?

99% of it is heat

true or false: xray production is a very efficient process.

false

true or false: xray tube heat production is dependent on the kVp and mAs selected

true

what determines the energy of the photon produced during characteristic radiation?

binding energy of tungsten

define characteristic cascade

incoming electron ejects inner shell electron, leaves vacancy in inner orbit (k shell), filled by outer shell electron

what is the k shell binding energy for tunsten?

69.5 kev

characteristic of xrays

are characteristic of the target material

have energy levels that can be calculated precisely

define kVp

highest energy of the beam (peak)

describe the relationship between the kVp and average energy of the primary beam photons

30-40% of kVp that you select

which type of xray production involoves ejecting an inner shell electron?

characterisitic

which type of xray production involves a cascade effect?

characteristic

what type of interaction is responsible for the majority of the xrays produced in diagnostic xray?

brems

the average energy of the xray beam is approximately ________ of the kVp selected by the technologist at the operators console

30-40%

when mA is interested, with other technical factors remaining the same, what part of the emission curve is affected?

is this directly or indirectly proportional?

amplitude

directly

how is the emission spectrum affected when kVp is increased? list two changes in the apperance

shifts to the right

amplitude increases

how is the average energy of the beam affected when kVp is increased?

it increases