Dental - Production/interactions Of X-Radiation

Front 1

Thermionic emission

Back 1

Release of electrons from the tungsten filament when the electrical current passes through it and heats the filament

Front 2

Kinetic energy

Back 2

Energy of motion

Front 3

The Kinetic energy of electrons is converted to x-ray photons through one of two mechanisms:

Back 3

1) general (braking) radiation
2) characteristic radiation

Front 4

General (braking) radiation
(Bremsstrahlung)

Back 4

A form of radiation that occurs when speeding electrons slow down because of their interactions with the tungsten target in the anode

Front 5

Characteristic radiation

Back 5

High-speed electron dislodges an inner shell electron from the tungsten atom and causes ionization of that atom

Front 6

Primary radiation

Back 6

Penetrating x-rayed beam that is produced at the target of the anode and that exits the tube head.
Useful beam

Front 7

Secondary radiation

Back 7

X radiation that is created when the primary beam interacts with matter.
Secondary radiation is less penetrating then primary radiation

Front 8

Scatter radiation

Back 8

A form of secondary radiation and is the result of an x-ray that has been deflected from its path by the interaction with matter

Front 9

At the atomic level, four possibilities can occur when an x-ray photon interact with matter:

Back 9

1) no interaction
2) absorption or photoelectric effect
3) Compton scatter
4) coherent scatter

Front 10

Absorption

Back 10

Total transfer of energy from the x-ray photon to the atoms of matter through which the x-ray beam passes

Front 11

Photoelectric effect

Back 11

One of the interactions of x-radiation with matter; the x-ray photons collides with a tightly bound, inner-shell electron and gives up all its energy to eject the electron from its orbit. All the energy of the photon is absorbed by the displaced electron in the form of kinetic energy

Front 12

Compton scatter over

Back 12

One of the interactions of x-radiation with matter in which the x-ray photon collides with a loosely bound, outer-shell electron and gives up part of its energy to eject the electrons from its orbit. The x-ray photon loses energy and continues in a different direction at a lower energy level.

Front 13

Coherent scatter

Back 13

One of the interactions of x-radiation with matter in which the path of an low-energy x-ray photon interacts with an outer-shell electron. No change in the atom occurs, and an x-ray photo of scattered radiation is produced