Merryl and Meaghan Perritti Board Review Flashcards
(229 cards)
What is the Scintillator made of?
Cesium Iodide
What is the purpose of the Scintillator?
Converts X-rays to Light
What is a photodiode made of?
Amorphous Silicon
What is a Scintillator made of?
Cesium Iodide
Number of Ionizations in Air
Exposure
Measures the energy of ionizations in air
Air KERMA
Air KERMA unit of measurement is:
Gya
1 Gy=
1 joule/kilogram (J/kg)
KERMA stands for:
Kinetic Energy Released in Matter
Energy absorbed in matter per unit mass
Absorbed Dose (D)
Includes photoelectric and absorption and Compton scatter
Absorbed Dose (D)
Absorbed Dose=
Photoelectric + Compton
If you increase mA how would it effect absorbed dose to patient?
increase
Increase SID how would that effect absorbed dose?
decrease
Expressed as Sieverts
Equivalent Dose
Equivalent Dose is expressed as
Sieverts
Factor reflecting the relative harmfulness of various types of radiation
WR
Wr for X-rays, Beta, Gamma Rays
1
Determined by multiplying the absorbed dose by radiation weighting factor
Equivalent Dose (EqD)
X-rays have a ______ LET and _________ RBE
low, low
The amount of energy deposited per unit length of track
LET
Gy x Wr = Sv
Equivalent Dose
Sv = Gy x Wt x Wr
Effective Dose
Can be used to calculate the risk of cancer
Effective Dose