Rpt Ch. 4

Front 1

What are the four essential elements required for x-ray production?

Back 1

A target, a vacuum, an electron source, and a high potential difference

Front 2

The target of the X-ray tube is made of?

Back 2

Tungsten

Front 3

A device for removing long wavelength radiation from the primary beam is?

Back 3

Filter

Front 4

The process of making an "electron cloud" surrounding a hot cathode is referred to as?

Back 4

Thermionic Emission

Front 5

The greatest portion of the x-ray beam is made up of?

Back 5

Bremsstrahlung radiation

Front 6

Below what KVp level is characteristic radiation no longer produced?

Back 6

70 KVp

Front 7

What is required to move the electron stream rapidly across the x-ray tube?

Back 7

High potential difference

Front 8

What percentage of the total energy applied to an x-ray tube target is converted into x-rays

Back 8

Less than 1%

Front 9

What types of radiation are produced at the anode?

Back 9

Characteristic and Bremsstrahlung Radiation

Front 10

what type of radiation is produced by the sudden slowing and direction change of the electron stream as kinetic energy is converted to other energy forms?

Back 10

Bremsstrahlung radiation

Front 11

What type of radiation is formed within the target atoms as a result of interactions with the K shell electrons?

Back 11

Characteristic Radiation

Front 12

The purpose of rotating the x-ray tube target is to?

Back 12

Increase the heat capacity of the anode

Front 13

A smaller effective focal spot will yield?

Back 13

Greater image sharpness

Front 14

A larger actual focal spot size will yield?

Back 14

Greater tube heat capacity

Front 15

The anode heel effect is a phenomenon of x-ray production that results in ?

Back 15

Uneven distribution of radiation within the field

Front 16

The penetrating power of the x-ray beem is controlled by varying the?

Back 16

Kilovoltage

Front 17

The MAs used for an exposure determines the?

Back 17

Quantity of radiation in the exposure

Front 18

An x-ray exposure is made using the following factors: 400 mA .02 Sec, 80 KVp, 40 inches SID and the large focal spot, in this case, the value of mAs is

Back 18

80 mAs

Front 19

Tungsten has a high melting point? True or False?

Back 19

True

Front 20

The added filtration required for general-purpose diagnostic x-ray units that have 0.5 mm Al equivalent of inherent filtration is?

Back 20

2.0 mm Al equivalent

Front 21

What is the primary advantage of x-ray beam filtration?

Back 21

Lowers the patient dose

Front 22

A steeper target angle provides?

Back 22

Smaller effective focal spot

Front 23

Filtration_____?_____ the average wavelength of the x-ray beam.

Back 23

Decreases

Front 24

The filament is made out of what and is on the cathode or the anode side?

Back 24

Tungsten and is on the Cathode side

Front 25

99% of kinetic energy is converted into?

Back 25

Heat

Front 26

What radiation occurs above 70 kVp?

Back 26

Characteristic Radiation

Front 27

What radiation occurs below 69 kVp?

Back 27

Bremsstrahlung Radiation

Front 28

What is the purpose of the rotating anode?

Back 28

To dissapate heat

Front 29

Using the anode heel effect always put the thicker body part where? Cathode or Anode?

Back 29

Cathode

Front 30

The penetrating power of the x-ray beam is varyied by?

Back 30

The kVps

Front 31

The unit used to indicate the quantity of exposure is?

Back 31

Milliampere-seconds or mAs

Front 32

What is used to measure the rate of current flow across the x-ray tube?

Back 32

Milliamperage

Front 33

the process of removing the long-wavelength photons from the x-ray beam

Back 33

Filtration

Front 34

How much filtration is inherent (built in)?

Back 34

0.5mm Al equiv.

Front 35

What is the total filtration for an x-ray machine?

Back 35

2.5mm Al equiv.