Midterm

Question 1

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 1

Heel effect

Question 2

The high voltage on the x-ray tube

Answer 2

Accelerates the electrons

Question 3

What happens to the energy spectrum when the kVp is decreased

Answer 3

The amplitude and maximum voltage decrease

Question 4

What is the power produced in an x-ray tube when operated at 110kv and 50 mA

Answer 4

5.5 kilowatts

Question 5

Most of the electrons which strike the target of an x-ray tube will produce

Answer 5

Thermal energy

Question 6

The primary purpose of voltage rectification is

Answer 6

Prevent electrons from striking the cathode

Question 7

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

Answer 7

It has a high atomic number

Question 8

Which is true regarding the use of filtration for an x-ray beam

Answer 8

It increases the average energy of the x-ray beam

Question 9

A change in which of the following has the least effect on the average energy of the electron spectrum

Answer 9

mAs

Question 10

Which of the following will increase the number of photons in the x-ray spectrum

Answer 10

Decreasing filtration
Increasing mAs
Increasing Kvp
Increasing atomic number Z

Question 11

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

Answer 11

Target material

Question 12

The efficiency of x-ray production increases with

Answer 12

The applied voltage between the anode and the cathode

Question 13

How will the emission spectrum change with an increase in mAs

Answer 13

Only amplitude of the spectrum will increase

Question 14

Increasing filtration to an x-ray beam will decrease the

Answer 14

Quantity of x-rays in the beam

Question 15

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

Answer 15

distance, d

Question 16

When waves appear to change direction at the interface between two different media is called

Answer 16

Refraction

Question 17

The double slit experiment is an example of how sub atomic particles

Answer 17

Behave as waves

Question 18

When sub atomic particles are directed at a small single slit, the resulting distribution is

Answer 18

Single bunch pattern

Question 19

The intensity of electrons created by photoelectric production can be increased by

Answer 19

Increasing the number of photons

Question 20

What is the energy of a photon beam if the frequency is 4. 25 x 10^23 hertz
h= 4.15 x 10^-15 eV-s

Answer 20

E: hF

4. 15 x 10^-15 eVs x 4.25 x 10^23 hz
5. 6375 x 10^8 ex
6. 76 x 10^9 ex
7. 76 Gev

Question 21

When waves seem to bend around an obstacle is called

Answer 21

Diffraction

Question 22

Increasing the energy of electromagnetic radiation is associated with

Answer 22

Increasing frequency

Question 23

For a given energy beam, the penetration ______ with _______ atomic number

Answer 23

Increases, lower

Question 24

Which of the following will always increase the quality of an x-ray beam

Answer 24

Increases the kVp and increases filtration
Increases the kVp and decreases the mAs
Increases mAs and increases the filtration

Question 25

Which is true about pair production

Answer 25

The photon interacts with the electromagnetic field of the nucleus
All the photon energy is given to the nucleus
The photon energy must be greater than 1.02 Mev

Question 26

The process where the photon is absorbed by the nucleus and a nucleon is emitted is called

Answer 26

Photodisintegration

Question 27

Which is true about eh probability of photoelectric interactions

Answer 27

Increases with increasing atomic number, z

Question 28

What is annihilation radiation

Answer 28

A positron interacts with a free neutron creating two photons

Question 29

Which is true about the probability of Compton interactions

Answer 29

Decreases with increasing energy
Independent of atomic number, Z
Directly proportional to the density of material

Question 30

What is the energy of a photon beam if the wavelength is 0.22mm

h= 4.15 x 10^-15 eV-s

Answer 30

5.7 meV

Referred to notes for work