What speed is a spectrum 1

X-RAY radiation

Continuous spectrum of an X-ray tube

If the characteristic lines are removed from the entire spectrum of an X-ray tube, the in Fig.1 emission spectrum shown.

It always occurs regardless of the acceleration voltage on the X-ray tube continuous spectrum on. The curve shifts towards higher photon energies with increasing acceleration voltage. The relative intensity of the X-rays also increases with the acceleration voltage. The fact that the spectrum breaks off at low photon energies and does not slowly decrease is due to the fact that the sensors used there no longer respond.

Accelerated charge emits radiation

The origin of this part of the X-ray spectrum can be traced back to a general phenomenon that occurs repeatedly in physics:

If an electrical charge is accelerated, i.e. if its speed or direction changes, electromagnetic radiation is generated. The higher the acceleration, the higher the energy of the photons that occur.

Note: In physics, acceleration is also used when the load is braked.

Slowing down fast electrons in the anode

Electrons that have been accelerated by the voltage \ (35 \, {\ rm {kV}} \), for example, have a speed of \ (35 \% \) the speed of light immediately in front of the anode, which is about a speed of \ (105000 \, \ frac {{{\ rm {km}}}} {{\ rm {s}}} \) is. These electrons now penetrate the anode material and are slowed down there. According to the above, electromagnetic radiation occurs during this process, which is known as Bremsstrahlung designated.