Final Exam Flashcards

1
Q

what does effective dose measure?

A

quantity of radiation received by radiation workers

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2
Q

what is effective dose measured in?

A

REM or Sievert (Sv)

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3
Q

what does absorbed dose measure?

A

RAD or Gray (Gy)

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4
Q

what is effective dose also known as?

A

equivalent dose

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5
Q

what does exposure measure?

A

quantifies radiation intensity

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6
Q

what does exposure represent?

A

unit of exposure in air

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7
Q

what is exposure measured in

A

Roentgen or Coulomb per kilogram (C/kg)

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8
Q

what does radioactivity measure?

A

quantity of radioactive material

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9
Q

what is radioactivity measured in

A

curie or becquerel

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10
Q

what occurs in excitation

A

the charged particle transfers all or part of its energy to orbital electron = raising them to higher energy shell

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11
Q

what occurs in ionization

A

energy transfer enough to overcome binding energy of orbital electron = ejection from atom

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12
Q

ionizing radiation = _____ wavelength
ionizing radiation = _____ frequency

A

short
high

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13
Q

How is wavelength measured

A

distance between any two successive wave crest

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14
Q

how is amplitude measured

A

height of wave from baseline

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15
Q

what is frequency measured in

A

hertz

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16
Q

characteristics of an xray (4)

A

neutral charge
photon
most penetrating ionizing radiation
not affected by external electric/magnetic fields

17
Q

what is considered as secondary radiation (2)

A

radiation leakage –> cracks in machine
scatter radiation

18
Q

what does global operations do?

A

controls all image reorientations
ex. flipping, inversion, translating

19
Q

types of detail processing (3)

A

edge enhancement
background suppression
smoothing