Dosimetry/ Radiobiology Flashcards
What is ‘exposure’ in radiation dosimetry?
the ionization created in air
unit for ‘exposure’ in radiation dosimetry
coulomb/ kg
What does KERMA stand for
Kinetic Energy Released per unit MAss
Unit for KERMAs
Gray
Joules/ kg
Does KERMA represent the quantity of radiation absorbed by patients?
No
Symbol for radiation exposure?
X
Symbol for Air Kerma?
K
Symbol for Absorbed Dose of radiation?
D
Unit for Absorbed Dose of radiation?
Gray
(Joules/ kg)
Old unit: Rad
Difference between ‘absorbed dose’ of radiation in comparison to air kerma?
radiation deposited rather than energy released
How is the Absorbed Dose of radiation often quoted?
Entrance Skin Dose
OR
Organ dose
Symbol for Equivalent Dose of radiation?
H
What is the relationship between absorbed dose and equivalent dose
Equivalent dose = Absorbed dose x Radiation Weighting
What is Linear Energy Transfer in Radiation?
How much radiation deposited per unit of distance
Unit for Linear Energy Transfer in radiation
keV/ micron
What is the radiation weighting factor for:
- x-ray/ gamma rays
- beta particles
- Alpha particles
- neutrons
- 1
- 1
- 20
- Variable