How Safe is that Imaging Test Flashcards
what is a sievert? SV unit?
Equivalent dose of radiation = absorbed + intensity
which is worse?
Alpha or beta
alpha particles
What are the particles what cause more damage?
Neutrons
Protons
alpha
What are the particles what cause less damage?
beta
gamma
what is effective dose?
amount and type of radiation + radiosensitivities of tisses/organs
effective and equivalent dose measured in?
SV sievert or mSV millisievert
example of a deterministic effect?
skin damage from sun exposure above threshold
what is probabilistic or stochastic effect?
no threshold for effect, eg. cancer
7 hour flight equivalent to?
CXR 0.04 or 0.05 mSV
what is natural background radiation exposure?
2mSV per year
each CT scan of abdomen is equivalent to?
1 year of smoking cancer risk (population basis)
one brain CT equivalent to how many background years?
1
one abdo and pelvis CT equivalent to how many background years?
12-15 yr
one L-spine CT equivalent to how many background years?
2
one chest CT equivalent to how many background years?
3-5 years