Interactions

Question 1

Electron Interactions:

Answer 1

Bremm
Characteristic

Question 2

Photon Interactions:

Answer 2

Compton
Coherent
Photoelectric
Pair Production
Photonuclear (disintegration)

Question 3

Interaction that occurs when an incoming electron is slowed and changes direction near the nucleus is known as:

Answer 3

Brehmstrahlung

Question 4

Interaction that occurs between photon and atomic nucleus

Answer 4

Pair production

Question 5

Photon interaction most likely to occur during kV imaging

Answer 5

Photoelectric effect

Question 6

X-ray interaction in which the photons energy is completed absorbed is

Answer 6

Photoelectric effect

Question 7

Predominant photon interaction during port imaging

Answer 7

Compton scattering

Question 8

The photon interaction with an outer shell electron that does not affect the photon’s energy is:

Answer 8

Coherent

Question 9

In radiation therapy, which of the following interactions with matter are least important?

Answer 9

Photoelectric

Question 10

Which of the following photon interactions with matter involves energy being converted to mass?

Answer 10

pair production
The photon interacts with the atomic nucleus resulting in the production of an electron and a positron. The energy of the photon was converted in the mass of the electron and positron.

Question 11

What interaction occurs when electrons impinge on the target

Answer 11

Bremmstrahlung

Question 12

The interaction between an incident photon and an inner shell electron which transfers all the energy of
the photon to the electron is called

Answer 12

Photoelectric

Question 13

Interaction near the atomic nucleus without interacting with the atomic nucleus followed by a change in direction
-only interaction that occurs in MV ranges
-can be kV or mV

Answer 13

Bremmstrahlung

Question 14

electron interacts with an orbiting electron, orbiting electron is removed as energy
-diagnostic x-ray ranges

Answer 14

characteristic

Question 15

Photon interacts with an outer shell electron, change in direction occurs with no energy lost
-excitation

Answer 15

Coherent

Question 16

Photon interacts with an outer shell electron, change in direction occurs with some energy released
-most common interaction in radt

Answer 16

Compton

Question 17

Photon interacts with inner shell electron, the energy is absorbed by the electron and then ejected as a ________
-characteristic is a secondary interaction to this
-most common in diagnostic imaging due to absorption

Answer 17

Photoelectric effect

Question 18

Photon interacts with the nucleus, disappearing then reappearing as an electron pair (positron + electron)
>1.022 MeV Threshold

Answer 18

Pair production

Question 19

Photon interacts with nucleus releasing a neutron
occurs in high Z# material + energies >10 MV

Answer 19

Photonuclear

Question 20

Port imaging

Answer 20

Compton

Question 21

kV imaging

Answer 21

Photoelectric