Ch. 12 X-Ray Interactions Flashcards Preview

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Flashcards in Ch. 12 X-Ray Interactions Deck (34)
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1

When an x-ray photon passes through matter, it undergoes a process called:

Attenuation

2

During the process of attenuation, x-ray photons in the beam:

-Reduce in number
-Lose energy
-Interact

3

During the process of attenuation, the x-ray photon may interact with:

-The nucleus
-The entire atom
-An orbital electron

4

Which atomic shell possesses the highest binding energy?

The K shell.

5

In which element are the inner-shell electrons more tightly bound to the nucleus?
a. Mercury (Z#=80)
b. Tungsten (Z#=74)
c. Lead (Z#=82)
d. Chromium (Z#=24)

c. Lead (Z#=82)
-highest atomic number out of the choices

6

Which energy-level electrons possess the highest total energy?
a. K
b. L
c. M
d. N

d. N

7

As the electron shells move farther from the nucleus, total electron energies ____ and binding energies ____.

Increase; decrease

8

When x-ray interacts with matter and scatters, the photon:

Exits with less energy

9

When x-ray photons interact with matter and change direction, the process is called:

Scatter

10

When an x-ray photon with a slightly greater energy than the biding energy of the inner-shell electron interacts with that inner-shell electron, the following interaction results:

Photoelectric absorption

11

During photoelectric absorption, a/an ____ shell electron is ejected.

Inner

12

During photoelectric absorption, the ejected electron is called:

A photoelectron

13

A photoelectron:

-Is matter and possesses energy
-Typically travels 1-2 mm in soft tissue
-Capable of creating biological changes

14

When an electron from an outer shell fills a vacancy in an inner shell,

A photon is released.

15

During the photoelectric interaction, as an electron transfers from an outer shell to a vacant inner shell, energy is released in the form of:

A characteristic photon

16

Secondary radiation energies are highest for which element?
a. Hydrogen
b. Carbon
c. Barium
d. Oxygen

c. Barium

17

An interaction that occurs between very low energy x-ray photons and matter is called _____ scatter.

-Coherent
-Classical
-Unmodified

18

During coherent scattering, the scattered photon possesses ______ as the incident photon.

The same energy, the same frequency, and the same wavelength

19

Compton scattering occurs when an incident x-ray photon interacts with a ____ electron.

Loosely bound outer-shell

20

The electron dislodged during Compton scattering is called the:

Recoil electron

21

The photon that exits the atom after a Compton scattering is called the ______.

Compton scattered electron.

22

During Compton scattering, the incident photon energy is divided between the:

Recoil electron and the scattered photon

23

As the angle of deflection is increased from 0 degrees to 180 degrees:

Greater energy is imparted to the recoil electron

24

Unwanted radiographic image densities caused predominantly by scattered photons is called:

Radiation fog

25

During which interaction with matter is the x-ray photon converted to matter in the form of two electrons?

Pair production

26

In which process is matter converted back to energy?

Annihilation reaction

27

What interactions has a significant impact on the x-ray image?

Photoelectric absorption and Compton scattering

28

In the human body, ____ is the predominant interaction through most of the diagnostic x-ray range.

Compton scattering

29

What interaction with matter results in a radiograph with a loss of radiographic image contrast?

Compton scattering

30

Which interaction with matter results in an image with higher contrast?

Photoelectric interaction