XRT

Question 1

Area of anode struck by the electrons from the cathode

Answer 1

Target

Question 2

An external casing containing the XRT

Answer 2

Protective Housing

Question 3

Lead-lined aluminum alloy

Answer 3

Protective Housing

Question 4

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

Answer 4

Protective Housing

Question 5

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

Answer 5

Protective Housing

Question 6

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

Answer 6

Protective Housing

Question 7

Vacuum-sealed enclosure surrounding the anode and cathode

Answer 7

Glass or metal enclosure/ envelope

Question 8

30-50 cm long

Answer 8

Glass or metal enclosure/ envelope

Question 9

20 cm in diameter

Answer 9

Glass or metal enclosure/ envelope

Question 10

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

Answer 10

Glass or metal enclosure/ envelope

Question 11

5cm^2 thin

Answer 11

XR window/ port

Question 12

area of the enclosure through which the useful beam is emitted

Answer 12

XR window/ port

Question 13

thin pyrex glass or berrylium

Answer 13

XR window/ port

Question 14

Allows maximum emission of x-rays with minimum absorption

Answer 14

XR window/ port

Question 15

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

Answer 15

Filament

Question 16

2mm diameter

Answer 16

Filament

Question 17

1 or 2 cm long

Answer 17

Filament

Question 18

1-2% thorium

Answer 18

Filament

Question 19

Thoriated tungsten

Answer 19

Filament

Question 20

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

Answer 20

Focusing cup

Question 21

Nickel or copper

Answer 21

Focusing cup

Question 22

Provides electrostatic repulsion

Answer 22

Focusing cup

Question 23

Confines electron beam to a small area of the anode

Answer 23

Focusing cup

Question 24

Has high voltage

Answer 24

Protective housing

Question 25

100mR/ hr at 1m

Answer 25

Protective housing

Question 26

Tube arcing

Answer 26

Glass enclosure/ envelope

Question 27

XRT electrodes

Answer 27

Cathode and anode

Question 28

Purpose of the 1-2% thorium in filament

Answer 28

Enhances thermionic emission efficiency and prolongs tube life

Question 29

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

Answer 29

Focusing cup

Question 30

Tungsten melting point

Answer 30

3410°C

Question 31

0.1 to 1 mm

Answer 31

Small focal spots

Question 32

0.3 to 2 mm

Answer 32

Large focal spots

Question 33

10,000 rpm

Answer 33

High capacity target

Question 34

3,400 rpm

Answer 34

Standard target

Question 35

Filament receives (1); XRT receives (2)

Answer 35

1. A 2. mA

Question 36

Serves as an electrical conductor

Answer 36

Anode

Question 37

Rhenated tunsten

Answer 37

Target (Both rotating and stationary)

Question 38

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

Answer 38

Target

Question 39

May vaporize

Answer 39

Target

Question 40

May have mollybdenum and graphite

Answer 40

Rotating target

Question 41

7cm radius

Answer 41

Target

Question 42

Atomic number, conductivity, and melting point are important characteristics

Answer 42

Target

Question 43

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

Answer 43

Stationary anode x-ray tubes

Question 44

General purpose XRTs

Answer 44

Rotating anode x-ray tube

Question 45

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

Answer 45

Target

Question 46

Most common anode materials

Answer 46

Copper, molybdenum, and graphite

Question 47

Purpose of alloying targets with 10% rhenium

Answer 47

Withstands heat

Question 48

1800mm^2

Answer 48

Rotating anode

Question 49

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

Answer 49

Rotating anode

Question 50

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

Answer 50

rotating anode

Question 51

Narrow so as to reduce its thermal conductivity

Answer 51

Anode stem

Question 52

Poor heat conductor

Answer 52

Anode stem

Question 53

Where the tungsten alloy target is embedded

Answer 53

Cu block

Question 54

Allows heat conduction

Answer 54

Cu block

Question 55

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

Answer 55

Cu block

Question 56

Used to turn the anode

Answer 56

Elevtromagnetic induction

Question 57

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

Answer 57

Rotor

Question 58

Bars of cu and soft iron

Answer 58

Rotor

Question 59

Causes the target to rapidly rotate during XR productino

Answer 59

Rotor

Question 60

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

Answer 60

Rotor

Question 61

Stationary coil windings

Answer 61

Stator

Question 62

Series of electromagnets

Answer 62

Stator

Question 63

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

Answer 63

Stator

Question 64

Conductino as heat dissipation technique

Answer 64

Stationary anode

Question 65

Induction (Radiation) as heat dissipating technique

Answer 65

Rotating anode

Question 66

Produces space charge

Answer 66

Filament

Question 67

Provides smooth flow of electrons in tube

Answer 67

Focusing cup

Question 68

Provides both xrs and heat

Answer 68

Target

Question 69

Responsible in sustaining heat in target

Answer 69

Anode stem