Fall-Winter 06-07 Flashcards
Which would you expect to receive the highest amount of radiation from an x-ray procedure?
Skin
Which form do we encounter Radon in?
Gasq
Higher energy photons are present with what?
Higher frequency
Radiation Hormesis refers to what?
the beneficial effects from exposure to low levels of radiation
Dosimetry is used for what?
Detecting radiation
What year was x-ray discovered
1895
Which of the following in the primary factor for radiographic contrast?
kV
What are considered the standard tube distances?
40 and 72 inches
what is the purpose of rectifiers
change the current from alternating to direct
the calculations of mA x time x kVp determine what?
The Head Units
what will reduce penumbra
small focal spot
what is the usual tube warm up procedure?
two exposures with the second using 2 times the mAs
if you want to produce more x rays what would you do
increase the mA
a decrease in the anode angle would have what effect?
Smaller effective focal spot
anode heel effect refers to what?
a reduced intensity of the x-ray bean on the anode side of the tube
which is the method of choice for limiting the size of an x-ray beam
collimation
where should compensation filtration be used when taking a lateral thoracic film?
lower thoracic spine
added filtration is a term for what?
filtration that is between the port and the collimator
the tube stand should only be moved after which has occured
the lock has been released
the 10 day rule refers to what?
10 days after the onset of menses is the safest time for x-raying a female
if a doctor has inadvertently x-rayed a pregnant patient and were dumb enough to keep taking retakes until the fetus was exposed to 5 rads what would be the probable outcome
no effect
how much lead equivancy do most shielding devices having in them
0.5mm
at a costume party you notice someone sitting under a TV experiencing thermionic emission. what are they dressed as
a filament
