How are x-rays produced? Flashcards
What area of the tube head is an x-ray produced?
glass X-ray tube
Where is the voltage in the tube head?
What voltage is used in dentistry?
step-up transformer
60-70kV (60,000-70,000)
What does the surrounding oil in the tube head do?
facilitate heat removal
What does the spacer cone in the tube head do?
indicates direction and distance of the beam
Production of x-rays occur at ……. level within the …… ……. tube
atomic
glass
x-ray
When button is pressed an …….. …….. flows through the ………… and ………. it up
electric current
filament
heats
Once the electrons are …….. they form around the …….
heated
filament
electrons travel from the filament to the ……… …….. by the ……… from the …… ……. ………. (gives them energy)
tungsten target
voltage
step up transformer
why is copper anode used in x-ray tube
good conductor of heat
allows heat to be quickly conducted away from target
what is the maximum photons (energy) referred as
E.max
How are the lowest energy photons removed from beam before hitting the patient?
passing the beam through a sheet of aluminium which absorbs and filters
Thickness of aluminium filter for
70kV or less (mostly used)
70kV or more
- 5mm
2. 5mm
on the x-ray panel what determines the energy
kV (normally will be set)
on the x-ray panel what determines the quality of the x-ray (blackening of the film)
mA (will probs be set)
Time (s) (can be altered)
What happens if the x-ray is overexposed or underexposed?
over - too dark
under - too pale
