Question 1

Characteristic x-ray photons result:

Accepted Answer

To produce characteristic radiation,outer-shell electrons must drop into an inner-shell vacancy created by the filament electron knocking out the orbital electron.

Question 2

To double the beam quantity:

Accepted Answer

To double the beam quantity,double the mAs.

Question 3

If a filament electron enters the tungsten atom with 80 keV of energy and leaves the atom with 75 keV of energy:

Accepted Answer

In that the filament electron lost only 5 keV of energy (which is a 5-keV brems photon),it must have traveled far from the nucleus.

Question 4

Which of the following factors affect beam quantity?

Accepted Answer

Distance,tube filtration,and kVp affect the quantity of the x-ray beam.

Question 5

If kVp is doubled,the quantity of radiation increases by a factor of:

Accepted Answer

Doubling the kVp increases beam quantity by a factor of 4 (the square of the ratio of the change).

Question 6

During the bremsstrahlung interaction,the filament electron:

Accepted Answer

During the bremsstrahlung interaction,the filament electron is attracted to the nucleus,causing it to slow down and change direction.

Question 7

A filament electron removes a K-shell electron and an M-shell electron fills the vacancy.The K-shell binding energy is 69.5 keV and the M-shell binding energy is 2.8 keV.What is the energy of the K-characteristic photon produced?

Accepted Answer

The energy of the photon produced is determined by subtracting the binding energy of the outer shell electron from the binding energy of the inner shell electron (69.5 - 2.8).

Question 8

During x-ray production the electrons penetrate the target approximately:

Accepted Answer

Electrons travel approximately 0.5 mm into the target during x-ray production.

Question 9

If the kVp is changed from 30 kVp to 90 kVp,the quantity of radiation in the beam increases by a factor of:

Accepted Answer

Tripling the kVp increases beam quantity by a factor of 9 (the square of the ratio of the change).

Question 10

The energy of the brems photon depends on:

Accepted Answer

The energy of the brems photon depends on the energy of the filament electron as it enters and exits the tungsten atom.The energy level as it exits depends on the strength of the attraction between the electron and the nucleus.

Question 11

When a filament electron knocks out a K-shell electron from the tungsten atom,it leads to:

Accepted Answer

Characteristic x-ray photons are the result of a filament electron knocking out a K-shell electron.

Question 12

Bremsstrahlung means

Accepted Answer

Bremsstrahlung is the German word for "braking" or "slowing down."

Question 13

The total number of x-ray photons in a beam is referred to as the:

Accepted Answer

X-ray quantity refers to the total number of photons in the beam.

Question 14

Which of the following is the primary factor controlling quantity?

Accepted Answer

mAs are the primary controlling factor for beam quantity.

Question 15

X-rays are produced by:

Accepted Answer

X-rays are produced by both characteristic and bremsstrahlung interactions between the filament electron and the tungsten atom.

Question 16

The average energy of a brems photon is ______ of the kVp selected.

Accepted Answer

The average energy of a brems photon is one third of the kVp selected.

Question 17

The process of a series of outer-shell electrons filling inner-shell vacancies right after the other is called:

Accepted Answer

The process of a series of outer-shell electrons filling inner-shell vacancies right after the other is called characteristic cascade.

Question 18

If a filament electron leaves the tungsten atom with 15 keV of energy and the brems photon produced was 65 keV,how much energy did the incoming filament electron have?

Accepted Answer

The incoming electron had 90 keV of energy because it only had 15 keV when it left the atom and the brems photon was 65 keV.

Question 19

The majority of the x-ray photons produced are:

Accepted Answer

The majority of the x-ray photons produced are the result of brems interactions.

Question 20

The energy of the characteristic x-ray photon depends on:

Accepted Answer

Characteristic radiation depends on the energy level of the incoming electron,the binding energy of the electron that is knocked out and the shell of the orbital electron that drops into the vacancy.

Quiz 6: X-Ray Production