Physics 2- HW 1-3

Question 1

The Focusing Cup…..

1) is responsible for rectification
2) carries a positive charge
3) directs the electrons towards the target
4) is located on the anode

Answer 1

Directs the electrons toward the target

Question 2

In an X-ray tube of the electron energy is converted to

1) heat
2) bremsstrahlung
3) characteristic x-rays
4) photons

Answer 2

Heat

Question 3

The X-ray intensity is less at the anode side of the X-ray beam than the cathode side of the X-ray beam. This is called the_______

Answer 3

Heel Effect

Question 4

In an X-ray tube the electrons travel from

1) cathode to focusing cup
2) cathode to anode
3) anode to cathode
4) none of the answers are correct

Answer 4

Cathode to Anode

Question 5

The high voltage on an X-ray tube is between

1) the target and the anode
2) the cathode and the filament
3) the cathode and the anode
4) the filament and the focusing cup

Answer 5

The cathode and the anode

Question 6

The low voltage on the X-ray tube

1) creates the electrons
2) All answers are correct
3) accelerates the electrons
4) focuses the electrons

Answer 6

Accelerates the electrons

Question 7

Which of the following is NOT a component of the high voltage generator

1) voltage rectifier
2) high voltage transformer
3) focusing cup
4) filament transformer

Answer 7

Focusing cup

Question 8

The primary purpose of rectification is

1) eliminate ripple
2) increase X-ray production
3) prevent electrons from striking the cathode
4) create high energy X-rays

Answer 8

Prevent electrons from striking the cathode

Question 9

Tungsten is a good material for an X-ray target because

1) it has good thermal conductivity
2) it has high atomic number
3) it has high melting point
4) All of the above

Answer 9

All of the above

Question 10

The electrical component which limits the direction of electron travel is called a

1) converter
2) dissipater
3) diode
4) rectifier

Answer 10

Diode

Question 11

Changing which of the following has the least effect on the average energy of the x-ray spectrum?

1) mAs
2) Target material
3) kVp
4) Filtration

Answer 11

mAs

Question 12

What is the first thing to happen in the production of characteristic x-rays?

1) An outer shell electron fills the created vacancy in the inner electron shell.
2) The incident electron loses energy by interacting with the nucleus.
3) The orbital electron is ejected
4) The incident electron is absorbed by the atom

Answer 12

The orbital electron is ejected

Question 13

Which of the following will have the greatest effects on the probability of bremsstrahlung production?

1) Tube potential, V
2) Tube current, mAs
3) Mass number, A
4) Atomic number, Z

Answer 13

Atomic Number, Z

Question 14

When filtration is added to an x-ray beam the average of the energy spectrum?

1) Shifts left and decreases amplitude
2) Shifts right and increases amplitude
3) Shift right and decreases amplitude
4) Shifts left and increases amplitude

Answer 14

Shifts right and decreases amplitude

Question 15

How will the x-ray energy spectrum change with an increase in mAs?

1) Only the amplitude of the spectrum will increase
2) Only the maximum kV will increase
3) Both amplitude and kV will increase
4) Neither the amplitude nor kV will change

Answer 15

Only the amplitude of the spectrum will increase

Question 16

The characteristic x-ray position will change location on the horizontal axis of the energy spectrum with a change in?

1) Change in filtration
2) High Voltage
3) Beam current
4) Target Material

Answer 16

Target Material

Question 17

The probability of Bremsstrahlung production is proportional to?

1) V
2) VZ
3) None of the above
4) 1/Z

Answer 17

None of the above

Question 18

Most of the x-rays produced in the target are?

1) Characteristic x-rays
2) Thermionic Emission
3) Excitation x-rays
4) Bremsstrahlung

Answer 18

Bremsstrahlung

Question 19

What is the power produced in an x-ray tube when operated at 140 kV and 35 mA?

1) 490 watts
2) 400 watts
3) 4.0 watts
4) 4.9 Kilowatts

Answer 19

4.9 Kilowatts

Question 20

What happens to the energy spectrum when the kVp is decreased?

1) Only the maximum voltage decreases
2) The amplitude decreases and the maximum voltage increases
3) The amplitude increases and maximum voltage decreases
4) The amplitude and maximum voltage decreases

Answer 20

The amplitude and maximum voltage decreases

Question 21

Exposure is a measure of the

1. quality of beam
2. current of beam
3. penetration of radiation
4. quantity of beam

Answer 21

Quantity of beam

Question 22

Increasing filtration to an x-ray beam will decrease the

1. quantity of x-rays in the beam
2. maximum energy in the beam
3. quality of the beam
4. most probable energy of the beam

Answer 22

Quantity of x-rays in the beam

Question 23

The intensity of the x-ray beam is inversely proportional to the square of the

1. filtration
2. charge, mAs
3. distance, d
4. potential, Kvp

Answer 23

Distance, d

Question 24

The x-ray tube mAs is a measure of the

1. beam current
2. beam quality
3. beam potential
4. charge produced

Answer 24

Charge produced

Question 25

Which of the following affects x-ray quantity?

1. mAs
2. All the answers are correct
3. beam current
4. filtration

Answer 25

All the answers are correct

Question 26

The historical unit for the Quantity of radiation is the

1. ampere, A
2. coulomb, C
3. coulomb/kilogram, C kg
4. roentgen, R

Answer 26

Roentgen, R

Question 27

If the Intensity of an x-ray beam is 64 C/kg at 80 kVp, what would the Intensity be at 135 kVp?

Answer 27

182.3 (Show work)

Question 28

If the Intensity of an x-ray beam is 104 C/kg at 88 cm, what would the Intensity be at 1.44 m?

Answer 28

38.8 (Show work)

Question 29

If the Intensity of an x-ray beam is 27 C/kg at 55 mAs, what would the Intensity be at 122 mAs?

What are the units of your answer for the previous question?

Answer 29

59.9 C/kg (Show work)