Electron Interactions

What is the incident particle for all electron interactions?

projectile electron

What does the projectile electron react with in anode heating?

Outer shell electron

What is the energy range for anode heating?

from 0 up to kVp

What is the primary event in anode heating?

Incident Projectile electron excites but does not eject outer shell electrons.

What is the secondary event in anode heating?

Excited Electron return to relaxed state by emitting InfraRed Radiation (Heat).

What is the product of anode heating?

Heat in the form of infrared radiation

What is the probability of anode heating occurring?

At 60 kVp 99.5% of the energy is converted into heat.

At 100kVp 99% of the energy is converted into heat.

What does the projectile electron react with in characteristic radiation?

Inner shell electron

What is the energy range for characteristic radiation?

K shell electron binding energy

Tungsten (69kEv)

What is the primary event in characteristic radiation?

Incident Projectile electron ejects an inner shell (K shell) electron.

What is the secondary event in characteristic radiation?

To regain stability outer shell electrons will drop in to fill inner shell vacancies.

Cascade - a series of shell vacancies getting filled (L drops to K, M drops into L, N drops into M, etc….)

Discrete spectrum

What is the product of characteristic radiation?

Deflected Incident Projectile electron Ejected Electron Emitted Characteristic X-Ray Photon

Ionized atom

Characteristic xray photon energy =

difference in binding shell energy

What does the projectile electron react with in Brems radiation?

Nucleus

What is the energy range for Brems radiation?

from 0 up to kVp

What events occur during brems radiation?

Incident Projectile electron path brings it close to the nucleus.

Nuclear forces impart a change of energy and direction on the electron and this change in energy due to "braking" creates an X-Ray.

Continuous spectrum

What is the product of brems radiation?

Deflected Incident Projectile electron

Emitted Bremmstrahlung X-Ray Photon

T/F Brems radiation makes up most of the xray beam

True