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211 > XRT > Flashcards

XRT Flashcards

1
Q

Area of anode struck by the electrons from the cathode

A

Target

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2
Q

An external casing containing the XRT

A

Protective Housing

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3
Q

Lead-lined aluminum alloy

A

Protective Housing

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4
Q

Protects against accidental electric shock and protects the tube from damage caused by rough handling

A

Protective Housing

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5
Q

Contains oil that serves as an insulator against electric shock and a thermal cushion to dissipate heat

A

Protective Housing

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6
Q

Some have a cooling fan to air cool the tube or the oil in which the XRT is immersed

A

Protective Housing

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7
Q

Vacuum-sealed enclosure surrounding the anode and cathode

A

Glass or metal enclosure/ envelope

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8
Q

30-50 cm long

A

Glass or metal enclosure/ envelope

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9
Q

20 cm in diameter

A

Glass or metal enclosure/ envelope

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10
Q

Maintains a vacuum inside the tube alloowing for a more efficient XR production and a longer tube life

A

Glass or metal enclosure/ envelope

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11
Q

5cm^2 thin

A

XR window/ port

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12
Q

area of the enclosure through which the useful beam is emitted

A

XR window/ port

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13
Q

thin pyrex glass or berrylium

A

XR window/ port

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14
Q

Allows maximum emission of x-rays with minimum absorption

A

XR window/ port

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15
Q

Thin coil of wire in which its diameter and length influence electron emission

A

Filament

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16
Q

2mm diameter

A

Filament

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17
Q

1 or 2 cm long

A

Filament

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18
Q

1-2% thorium

A

Filament

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19
Q

Thoriated tungsten

A

Filament

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20
Q

Negatively charged metal in which the depth of filament, shape, and charge are important determinants of its effectivity

A

Focusing cup

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21
Q

Nickel or copper

A

Focusing cup

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22
Q

Provides electrostatic repulsion

A

Focusing cup

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23
Q

Confines electron beam to a small area of the anode

A

Focusing cup

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24
Q

Has high voltage

A

Protective housing

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25
Q

100mR/ hr at 1m

A

Protective housing

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26
Q

Tube arcing

A

Glass enclosure/ envelope

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27
Q

XRT electrodes

A

Cathode and anode

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28
Q

Purpose of the 1-2% thorium in filament

A

Enhances thermionic emission efficiency and prolongs tube life

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29
Q

Acts as an exposure switch (in a grid-controlled XRT)

A

Focusing cup

30
Q

Tungsten melting point

A

3410°C

31
Q

0.1 to 1 mm

A

Small focal spots

32
Q

0.3 to 2 mm

A

Large focal spots

33
Q

10,000 rpm

A

High capacity target

34
Q

3,400 rpm

A

Standard target

35
Q

Filament receives (1); XRT receives (2)

A
  1. A
  2. mA
36
Q

Serves as an electrical conductor

A

Anode

37
Q

Rhenated tunsten

A

Target (Both rotating and stationary)

38
Q

Abruptly degenerates and stops electrons in the tube current, allowing the production of x-rays

A

Target

39
Q

May vaporize

A

Target

40
Q

May have mollybdenum and graphite

A

Rotating target

41
Q

4mm^2

A

Stationary target

42
Q

7cm radius

A

Target

43
Q

Atomic number, conductivity, and melting point are important characteristics

A

Target

44
Q

Used in dental x-ray imaging systems, some portable imaging systems, and other special-purpose units in which high tube current and power are not required

A

Stationary anode x-ray tubes

45
Q

General purpose XRTs

A

Rotating anode x-ray tube

46
Q

Receives electrons emitted by the cathode and conducts them through the tube to the connecting cables and back to the high-voltage generator

A

Target

47
Q

Most common anode materials

A

Copper, molybdenum, and graphite

48
Q

Purpose of alloying targets with 10% rhenium

A

Withstands heat

49
Q

1800mm^2

A

Rotating anode

50
Q

1mm focal spot

A

Rotating anode

51
Q

Provides nearly 500 times more area to interact with the electron beam

A

Rotating anode

52
Q

Higher tube currents and shorter exposure times
are possible with the —

A

rotating anode

53
Q

Narrow so as to reduce its thermal conductivity

A

Anode stem

54
Q

Poor heat conductor

A

Anode stem

55
Q

Where the tungsten alloy target is embedded

A

Cu block

56
Q

Allows heat conduction

A

Cu block

57
Q

Mechanically supports the tungsten target and removes heat efficiently from the target

A

Cu block

58
Q

Used to turn the anode

A

Elevtromagnetic induction

59
Q

Shaft inside the enclosure rigidly connected tot he target through the anode stem

A

Rotor

60
Q

Bars of cu and soft iron

A

Rotor

61
Q

Causes the target to rapidly rotate during XR productino

A

Rotor

62
Q

High strength ball bearings allow it to smoothly rotate at high speeds

A

Rotor

63
Q

Stationary coil windings

A

Stator

64
Q

Series of electromagnets

A

Stator

65
Q

An electric motor that induces the rotor to spin at a very high speed

A

Stator

66
Q

Conductino as heat dissipation technique

A

Stationary anode

67
Q

Induction (Radiation) as heat dissipating technique

A

Rotating anode

68
Q

Produces space charge

A

Filament

69
Q

Provides smooth flow of electrons in tube

A

Focusing cup

70
Q

Provides both xrs and heat

A

Target

71
Q

Responsible in sustaining heat in target

A

Anode stem

211 (1 decks)

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