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RAd 205

QuestionAnswer
partial absorption + scatter compton
the three types of ionizing waves UV, xray, gamma rays
largest contributer to pt exposure photoelectric
SI units for exposure in the air coulomb/kg
absorbed dose is measured in grays
air kerma is measured in grays
annual occupational effective dose limit vs public 50 msv / 5msv
cumulative effective dose formula 10 msv x age
LET and RBE represent risk benefit analysis Linear energy transfer relative biological effectiveness
LD50 -30 describes the dose that kills 50% of the exposed cell population in 30 days
oxygen effect well oxygenated cells are more radiosensitive than hypoxic cells because they keep free radical damage
tissue reaction where there IS a threshold and the severity increases with dose (skin damage, sterility) deterministic tissue reactions
tissue reactions where there is NO threshold and any probability of injury is not dose dependent (cancer, genetics effect) stochastic
threshold for bone marrow injury 1 Gy
threshold for GI injury 6mGy
threshold for nerve cell injury 50mGy
Cells that are highly specialized and mature are ____ radiosensitive less
what is now the primary method of dose-reduction for pts collimation
Created by: user-1989152
 

 



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