X-Ray Production PowerPoint Part 1

X-rays are produced by __________ electrons that are suddenly _________.

high speed, stopped

Objects in motion have ___________ in proportion to their mass and the square of their ________.

Kinetic energy, velocity

KE=(1/2)mv^2

All electrons have the same _______, you can only change KE by changing the ________.

mass, velocity (kVp)

Intensity = ? = ?

quantity = number of photons

Energy = ? = ?

quality = penetrability of photons

As KE increases so does _______ and _______.

intensity and energy

The speed of electrons is about...

1/2 the speed of light

The tube current is the...

number of electrons in motion inside the tube

What happens when the electrons interact with the tungsten atoms of the anode?

The KE of the electrons is transferred to the anode and the electrons slow down.

What does the interaction of electrons at the tungsten anode result in?

99% heat and EM radiation

When the outer shell electrons of the tungsten become excited and then return to their ground state, what happens?

infrared emission (anode glows)

The infrared emission accounts for...

most of the heat in the tube (99%)

After infrared emission occurs, what is the remaining KE used for?

x-ray production

Is x-ray production efficient? What percent of KE is turned into x-rays?

No, only 1 %

Higher tube current = ?

higher heat, but not higher efficiency

Higher kVp = ?

higher efficiency

What kVp is used in radiation therapy?

20 MV to destroy cancerous tissues