TCDHA Radiography Theory
Scatter radiation - Answer- - form of secondary radiation
- result of xray photon deflected in all directions travelling to all parts of client's body and to all areas of the op
- detrimental to client and radiographer
Compton scatter - Answer- - Evidence of ionizat...
TCDHA Radiography Theory
Scatter radiation - Answer- - form of secondary radiation
- result of xray photon deflected in all directions travelling to all parts of client's body
and to all areas of the op
- detrimental to client and radiographer
Compton scatter - Answer- - Evidence of ionization
- xra photon collides w outer shell + gives up part of its energy to eject electron from
it's orbit
- ejected electron is known as compton or recoil electron
Coherent scatter - Answer- - unmodified scatter
- when low energy photons interact with outer shell electron
- no changes in atom
- no ionization
- 8% percent of xradiation
PID (positioning indicating device) - Answer- - projects from tube head and used to
direct xradiation to client's face
- lead lined to prevent scatter radiation
- cones are short or long (8" or 16")
Milliamperage - Answer- - refers to totaly quantity of xrays produced
- controls film blackening
Higher mA, darker the xray
kV - Answer- Higher kVp = higher penetrating power
Tungsten target - Answer- Aka wolfram
Attached to copper stem
Speeding electrons hit the tungsten target
Aluminum filter - Answer- Filters out long wavelengths with poor penetration power
Ionization - Answer- The production of ions, or the process of converting an atom
into ions
Deals with only electrons
Primary Radiation - Answer- - xray thats produced at target or anode and exit the
tubehead
Secondary Radiation - Answer- x-radiation that is created when the primary beam
interacts with matter.
Eg. Soft tissue of head, cranial bones and teeth
Scatter radiation - Answer- - secondary radiation
, - result of xray photon deflected in all directions travelling to all parts of the clien'ts
body and to all areas of the operatory
Electrical force (Binding force) - Answer- - electrostatic force or attraction between
the positive nucleus and the negative electrons
- k shell is strongest
Cathode - Answer- Negative charge terminal
Hotter the filament. More electrons produced
Anode - Answer- Positive charge terminal
Mostly made up of copper rod
Copper like oil used to dissipate heat
Matter - Answer- Anything that has mass and occupies space
When matter is altered, energy results
All matter is composed of atoms
Atom - Answer- Tiny, invisible particle thats the fundamental unit of matter
Consists of 2 parts: nucleus and orbital electrons
118 different atoms identified (periodic table)
Nucleus - Answer- Core of atom
Composed of protons, neutrons and electrons
Atom= football stadium nucleus = football
Atomic weight/mass number - Answer- Number of protons and neutrons in the
nucleus
Atomic number - Answer- # of protons inside nucleus = number of electrons outside
nucleus
How are atoms joined? - Answer- By chemical bonds
How can molecules forms? - Answer- Transfer of electrons or by the sharing of
electrons
Ion - Answer- An atom or molecule which has lost or gained one or more electrons,
making it positively or negatively charged
Ionizing radiation - Answer- Radiation that is capable of producing ions by removing
or adding an electron to an atom
2 classifications of ionizing radiation - Answer- Particulate and electromagnetic
Particulate radiation - Answer- tiny particles of matter that possess mass and travel
in straight lines and at high speeds; transmits kinetic energy
Beta particles - Answer- Fast moving electrons emitting from the nucleus
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