Type of x ray beam produced Flashcards
what is Brems radiation?
also known as braking radiation. Occurs when incident electron targeted at nucleus slows down as it approaches the center of the atom. the energy of deceleration is the photons it releases.
when does brems radiation only occur?
when it interacts with the force field of the nucleus.
The strong positive nuclear field of the nucleus attracts the negative charged of the projectile electron causing it to…
1 deviate from its original path
2 slow down or decelerate
3 lose kinetic energy. (this is what causes the x-ray known as Brems radiation)
Below 70kVp all radiation produced is…
Brems
Above 80 kVp __% is brems and __% is ______
80%, 20%, characteristic radiation
what does the amount of braking and deceleration dependent upon?
the speed of the electrons and how close it got to the target nucleus.
what offers the maximum energy in Brems Ray?
direct collision with the nucleus, electrons transfers its entire energy this way.
what does high voltage do to the anode?
turns it positive, makes the free electrons attracted to the anode. this is potential difference
when you increase the voltage to the _____ we can increase the speed of the _____
anode, electrons
when atomic number increases, so does the….
attraction force
Why is characteristics radiation called this way?
because it is unique to the characteristics of the target element.
What determines the strength of the characteristic ray?
the distance between the donor shell from the vacancy shell. The further they are the higher the energy of the photon produced.
can you produce characteristic ray from any other shell aside from K?
no you cannot. Other shell is too weak to be significant.