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Radiography > Intro Radiography > Flashcards

Intro Radiography Flashcards

1
Q

What do xrays allow a view of?

A

Mineralised tissues

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2
Q

Who discovered xrays? And when?

A

Wilhelmina Conrad roentgen

1895

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3
Q

When were x Ray’s first used in dentistry?

A

1896

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4
Q

What does an atom contain?

A

Positive charged protons
No charge neutrons
Negative charged electrons

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5
Q

What does the nucleus contain?

A

Protons and neutrons

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6
Q

Where are electrons located?

A

Orbit nucleus in energy shells

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7
Q

How many is the maximum number of electrons for each shell?

A 
K-2
L-8
M-18
N-32
O-50
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8
Q

What keeps electrons within shells?

A

Binding energy

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9
Q

What is required to removed electrons from an atom?

A

Energy

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10
Q

What is the atomic number?

A

Number of protons in nucleus

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11
Q

What is neutron number?

A

Number of neutrons in nucleus

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12
Q

What is the atomic mass number?

A

Atomic number + neutron number

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13
Q

What is an isotope?

A

Atoms with same atomic number

Different neutron number

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14
Q

What is a radioisotope?

A

Isotopes with unstable nuclei which undergo radioactive disintegration

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15
Q

Describe an alpha Particle

A 
2 protons + 2 neutrons 
Large
Positive charge
Slow
Penetrate 1-2 MM. In tissue
Energy- 4-8 MeV 
Damage potential- extensive ionisation
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16
Q

Describe beta particles

A 
Electrons
Small
Negative charge
Penetrate 1-2 cm in tissue 
Energy- 100 kev- 6mev 
Damage potential- ionisation
17
Q

Gamma rays

A 
Electromagnetic radiation
No size
No charge
Very fast
Pass through tissue
Damage potential- ionisation
18
Q

What type of particles are similar to xrays used in dentistry?

A

Gamma rays

Energy levels less

19
Q

What is energy measured in?

A

eV

20
Q

What is frequency measured in ?

A

Hertz

21
Q

What is wavelength measured in?

A

Metres or nano metres

22
Q

At what speed do photons travel?

A

Speed of light - 186 282 miles per second

23
Q

What is a radiograph?

A

A latent image cause by xrays passing through and object and causing physical change to crystals on the emulsion of a film

Radiography (18 decks)

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