Radiologic units Flashcards
The amount of radiation delivered to a point
Exposure
Modern form of the metric system
International System of Units
Convetional unit for exposure
Roentgen
SI unit for exposure
Coulomb per kilogram
Quantity of Xray or gamma ray
Roentgen
Most commonly is used when performing calculation on gasses
Standard Temperature Pressure
1 R
2.58 x 10^ 4 C/kg
1 C/kg
3876 R
Unit of electrical charge
Coulomb
1 coulomb
6.242 x 10^16 ionizations
Concentration of radiation energy absorbed at a specific point
Absorbed dose
Conventional unit for absorbed dose
rad
SI unit of absorbed dose
Gray
Pioneer in the field of measurement of radium radiation
Louis Harold Gray
1 Rad
100 erg/g
1 Gy
100 rad
Use to express the biological impact of radiation on persons
Dose equivalent (H)
Unit for dose equivalent
Rem
Si unit for dose equivalent
Sv (Sievert)
A swedish medical physicist renowned for work on radiation dosage measurement
Rolf Maximilian Sievert
Quantity for expressing relative risk to humans
Effective dose
Use to determine the effective dose from the equivalent dose
Tissue Weighing Factor
Represent radiation harm for which there is no threshold
Probabilistic effects / Stochastic
Refers to the number of atoms disintegrating per second
Activity
Traditional unit for activity
Curie
Si unit for activity
Becquerel
1 Ci
3.7x10^10 DPS
A substance studied by the curies
Ra 226
3.7 x 10^10 Bq
37 GBq
1 Bq
2.7x 10^-11 Ci
Expresses how much ionization the beam causes
Exposure
Quantity of radiation energy absorbed per unit mass of tissue
Absorbed dose
The amount of exposure that will produce 2.58 x 10-4 c
Roentgen
1 Sv
100 rem
Effective dose
Absorbed dose x WT
