X-ray Production PowerPoint Part 2: Characteristic Radiation

Characteristic x-rays occur when an ___________ electron fills an _________ void.

outer-shell, inner-shell

When a projectile electron interacts with an inner-shell tungsten electron, what happens?

the tungsten atom is ionized which leaves a hole in the inner-shell (an unnatural state)

When the tungsten is in an unnatural state, what happens?

an outer-shell tungsten electron fills the hole

When the outer shell electrons fills the inner-shell hole, what happens?

the energy change leads to x-ray emission

The characteristic x-ray has energy equal to the difference in _______________ of the electrons involved.

binding energies

K-shell binding energy = 69.5 KeV

L-shell binding energy = 12 KeV

If the K-shell void is filled by an L-shell electron, what is the energy of the characteristic x-ray?

69.5 Kev - 12 Kev = 57.5 KeV x-ray photon

The k-shell can be filled by an electron from __________.

any shell

What shell layer can characteristic x-rays be created at?

any shell layer, but only k-shell x-ray are of diagnostic value

Since only the K-shell characteristic x-rays are of diagnostic value, what do the remaining shells characteristic x-rays contribute to?

only contributes to patient dose

M-shell binding energy = 3 KeV

N-shell binding energy = 0.6 KeV

If the M-shell hole is filled by an N-shell electron, what is the energy of the characteristic x-ray?

3 KeV - 0.6 Kev = 2.4 KeV x-ray photon

What is an electron cascade?

when multiple characteristic x-rays occur which leads to a vacancy on the outer shell

K-shell x-rays are only produced at _______ kVp or _______.

69.5 kVp or higher

At 100% kVp, ______% of the x-ray beam is characteristic.

15%

Mastered (13)

You've been getting these terms right!