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RT Exam > Selected Topics > Flashcards

Selected Topics Flashcards

1
Q

What describes the differences between density of a radiograph?

A

Contrast

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2
Q

Would a long or short wavelength produce a sharper contrast radiograph

A

long

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3
Q

___ occurs when incident x-ray photon is deflected from its original path by an interaction with an electron

A

compton scattering

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4
Q

___ refers to the scattering of electrons and reduces contrast and definition

A

scatter

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5
Q

__ refers to scatter radiation that bounces off an object behind the film then back into the film

A

backscatter radiation

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6
Q

__ describes the fraction of radiation absorbed or scattered per unit thickness of the absorber

A

linear attenuation coefficient

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7
Q

What is the partially shaded outer region of a shadow cast by an opaque object?

A

Penumbra

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8
Q

This type of X-ray produces radiation of composed of a continuous spectrum of energies over some range.

A

Bremmstrahlung

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9
Q

As wavelengths become shorter/longer, penetrating power increases

A

shorter

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10
Q

What 2 factors determine film contrast?

A

type of film used, process used to develop film

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11
Q

Who discovered radioactive materials?

A

Henri Becquerel

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12
Q

The thickness of a material where 50% of incident energy has been attenuated is known as __

A

half value layer

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13
Q

Who discovered the x-ray?

A

Wilheim Roentgen

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14
Q

__ and __ is a form of particle radiation and electomagnetic radiation.

A

x-rays and gamma rays

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15
Q

What happens to penetrating power as radiaion energy increases?

A

increases

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16
Q

A specific radioactive source always produces gamma rays at the same A) Intensity, B) Activity, C) Energy level

A

C) Energy level

17
Q

Through what two processes is radiation produced in x-ray generators?

A

Bremsstrahlung, K-Shell

18
Q

__ indicates the amount of attenuation per centimeter.

A

Linear attenuation coefficient

19
Q

__ is the rate an radioactive isotope becomes stable

A

Decay Rate

20
Q

What two types of interactions account for the majority of attenuation in industrial radiography?

A

commpton scattering and photoelectric absorption

21
Q

What is the purpose of using lead foil sheets in radiography?

A

to increase film density because incident radiation liberates electrons to help expose the film

22
Q

Higher energy radiation has more A) Speed, B) Incident Energy, C)Penetrating Power

A

C) Penetrating Power

23
Q

What causes undercut?

A

scattering within the film

24
Q

What is undercut?

A

loss of resolution at a sharp thickness transition area

25
Q

Why are radiation beam filters used?

A

to remove low energy radiation to increase definition

26
Q

Where are Image Quality Indicators placed?

A

on front side of test component, in area of similar thickness to primary area of interest

27
Q

What are the four types of radiation-matter interactions that contribute to total attenuation?

A

compton scattering, pair production, photoelectric absorption, rayleigh scattering

28
Q

__ x-ray technique allows test component to be viewed in various cross-sectional slices

A

computed tomography

29
Q

Why is target of x-ray tube often made of tungsten?

A

It’s high atomic mass results in more x-rays generated due to atomic particle interactions.

30
Q

List 3 strengths of radiographic inspection.

A

not limited to material type, can be used to inspect assembled components, can detect surface and subsurface features

31
Q

What causes attenuation of radiation (2)?

A

absorbtion, scattering

32
Q

What type of defects are radiography best suited?

A

volumetric defects such as porosity

33
Q

When should radiography be used for crack detection?

A

the orientation of the crack is known

RT Exam (1 decks)

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