Final Exam Flashcards
what does effective dose measure?
quantity of radiation received by radiation workers
what is effective dose measured in?
REM or Sievert (Sv)
what does absorbed dose measure?
RAD or Gray (Gy)
what is effective dose also known as?
equivalent dose
what does exposure measure?
quantifies radiation intensity
what does exposure represent?
unit of exposure in air
what is exposure measured in
Roentgen or Coulomb per kilogram (C/kg)
what does radioactivity measure?
quantity of radioactive material
what is radioactivity measured in
curie or becquerel
what occurs in excitation
the charged particle transfers all or part of its energy to orbital electron = raising them to higher energy shell
what occurs in ionization
energy transfer enough to overcome binding energy of orbital electron = ejection from atom
ionizing radiation = _____ wavelength
ionizing radiation = _____ frequency
short
high
How is wavelength measured
distance between any two successive wave crest
how is amplitude measured
height of wave from baseline
what is frequency measured in
hertz
characteristics of an xray (4)
neutral charge
photon
most penetrating ionizing radiation
not affected by external electric/magnetic fields
what is considered as secondary radiation (2)
radiation leakage –> cracks in machine
scatter radiation
what does global operations do?
controls all image reorientations
ex. flipping, inversion, translating
types of detail processing (3)
edge enhancement
background suppression
smoothing
