Production of x-rays Flashcards
what is the function of the cathode?
source of electrons for the generation of x-rays
the cathode is a fine wire made of what?
tungsten
how does the cathode work?
? passes along it exciting electrons, electrons lost from ?? creating an ? around the cathode which ? electrons focusing them on the ?
current
outer shells/orbits
electron cloud
expels
anode
what is the anode made of?
- Small tungsten target embedded in copper
how are x-rays produced
Large ?? between ? and ?
? electrons from cathode bombard the ? anode
High energy electrons ? or ? creating ?, most is ? but some is ?
potential difference
anode
cathode
-ve
+ve
stop
decelerate
energy
heat
x-rays
what are the 2 types of x-ray spectra produced?
continuous spectrum
characteristic spectrum
what is the continuous spectrum?
Wide range of photon energies
what is the characteristic spectrum?
Emitted by loss of electrons in K and L shells
x-rays
(characteristic spectrum)
the x-ray tube needs to be operating above ? to produce an x-ray
69.6kV
define scattering
random change in direction after hitting something
define absorption
deposition of energy in tissues
define intensity
number of x-ray photons in a defined area of the beam
define attenuation
reduction in intensity of the beam due to scattering and absorption
define ionisation
removal of electron from neutral atom to give -ve (electron) and +ve (atom) ions
define penetration
the ability of photons to pass through or into tissues/materials
