Radiologic Units Flashcards
Amount of radiation delivered to a point
Exposure
How much the ionization the beam causes in air
Exposure
Conventional unit of exposure
roentgen (R)
SI unit for exposure
C/kg
roentgen is in honor of ______
Wilhelm Conrad Roentgen
definition of roentgen
Quantity of X- or gamma rays …
Standard temperature
Zero degrees Celsius
32 degrees Fahrenheit
273.15 Kelvin
Standard Pressure
1 atm
1R = _____ C/kg
2.58 x 10E-4 C/kg
1C/kg = _____ R
3876 R
Unit of electrical charge
Coulomb
1C = _____ ionizations
6.242 x 10E18 ionizations
Concentration of radiation energy absorbed at a specific point within the body tissue
Absorbed dose
Quantity of radiation energy absorbed per unit mass of tissue
Absorbed Dose
Conventional unit of absorbed dose
rad
1 rad = ____ ergs/g
100 ergs/g
SI unit of absorbed dose
gray (Gy)
1Gy = ____ J/kg
1 J/kg
1 rad = ____ Gy
0.01 Gy
Gy is named after _____
Louis Harold Gray
Pioneer in the field of measurement of radium radiation ….
Louis Harold Gray
Nationality of Louis Harold Gray
British
Biological impact of radiation on persons ….
Dose Equivalent
Personnel exposure is recorded as ____
Dose equivalent
Conventional unit of DE
rem
SI unit of DE
sievert (Sv)
Sievert is named after ____
Rolf Maximilian Sievert
Nationality of Rolf Maximilian Sievert
Swedish
Work on radiation dosage measurement and ….
Rolf Maximilian Sievert
More biologically damaging to live tissue
Alpha particle
Formerly known as quality factor
Radiation weighing factor
Relative risk to humans
Effective dose
Formula of effective dose
ED = AD x Wt
Multiplier used to determine the effective dose from the equivalent dose in one or more organs or tissues
Tissue Weighing Factor
Number of atoms that disintegrate per second
Activity
Modern form of metric system
International System of units
