Exam 1 - 2. Radiation Physics

Question 1

4

What are the 5 components of the operator control panel?

Question 2

5-6

What are the 8 components of the tube head?

Question 3

7

Is the cathode negative or positive?

Question 4

7

The cathode end of the X-ray tube has a ____ filament.

Question 5

7

The cathode end of the X-ray tube is a source of _____.

Question 6

7

The cathode end of the X-ray tube is heated with a _______ and emits electrons at a rate ________. The term for this is _____.

Question 7

7

The focusing cup is made of ____.

Question 8

7

The focusing cup is ____ charged.

Question 9

7

The focusing cup focuses ____ into a narrow beam directed to the _____, which is ____ charged.

Question 10

8

Is the anode positive or negative?

Question 11

8

The tungsten target transforms the _____ into _____.

Question 12

8

The tungsten target is highly _____. It produces ____% heat and ____% X-rays.

Question 13

8

The copper stem of the anode end of the x-ray tube works as a ______ to ________ to avoid ____.

Question 14

9

What are four reasons why tungsten is selected as the target?

Question 15

9

What effect does high atomic number have on x-ray production?

Question 16

9

What effect does high melting point have as a target?

Question 17

9

Tungsten has a high thermal conductivity to ______.

Question 18

9

Tungsten has a low vapor pressure, which helps to ______l

Question 19

10

What are the four conditions necessary for X-ray production?

Question 20

11

Thermionic emission: production of an electron cloud:

Low voltage filament current heats the tungsten filament to ______ with resultant _________ from the tungsten atom. This is called ____.

Question 21

12

Acceleration of electrons to a high speed:

High potential difference is produced between the _____ and the ____ by applying a _____ between them. A ______ is used. Electrons are accelerated to a _____.

Question 22

13

Concentration/Focusing of electrons:

Electron beam is focued by the _____ and directed toward the _____.

Question 23

14

Sudden stoppage of electron stream to produce x-rays:

Upon striking the focal spot in the anode, the electron stream is ____, and _____ of the electron stream undergoes conversion to ______ and ______. The copper stem removes the ____ from the tungsten.

Question 24

16

The focal spot is the area on the target to which the ______ directs the _____ and from which the ______.

Question 25

16

The size of the focal spot is important for ______. A smaller focal spot results in ________.

Question 26

16

What is the disadvantage to a smaller focal spot?

Question 27

16

What are the two ways to overcome the disadvantage of more heat accumulating with a smaller focal spot?

Question 28

17

The rotating anode allows ___________. It is used in _____.

Question 29

18

What is the line focus principle (Stationary anode)?

Question 30

18

The line focus principle results in ______ while maintaining _______.

Question 31

19

The actual focal spot is the ________.

Question 32

19

The effective focal spot is the _____.

Question 33

19

What is the relationship between the effective focal spot and the actual focal spot?

Question 34

20

What are the 2 principal functions of the power supply?

Question 35

21

What is the transformer?

Question 36

22

What are the 3 types of transformers in the x ray unit?

Question 37

23

The step-down transformer is used to convert _____ volts to ____ volts to _____.

Question 38

23

The step-down transformer is regulated by the _____.

Question 38

23

With the step-down transformer, increasing the _____ will increase the number of ______.

Question 39

23

The step-up transformer is used to convert ____ volts to ____ volts to move the electrons ______.

Question 40

23

The step-up transformer is regulated by the _____.

Question 41

23

With the step-up transformer, increasing the ____ will increase the _______ traveling from the _____.

Question 42

24

What does exposure time determine?

Question 43

24

What is the time delay circuit?

Question 44

24

What is the timing circuit?

Question 45

25

What doees kV control?

Question 46

25

What does mA control?

Question 47

25

What does exposure time control?