TCDHA RADIOGRAPHY THEORY ACTUAL
TEST PAPER QUESTIONS AND SOLUTIONS
COMPLETE STUDY GUIDE
●● 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
TEST PAPER QUESTIONS AND SOLUTIONS
COMPLETE STUDY GUIDE
●● 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
