Absorbed dose

The absorbed dose is a physical quantity and outputs the mean of ionizing radiation to a specific absorber with the density of output power based on the mass of irradiated volume element.

The absorber material must therefore be considered in the determination and specification of absorbed doses. This is because the fact that the ionization energies vary for different atoms or molecules.

Determination

The absorbed dose is not measured directly, for practical reasons, but determined by the sizes of ion dose or kerma.

From the measured ion dose, one can easily derive the corresponding absorbed dose in air. Since the formation of an ion pair in the air in the middle 34 eV energy is necessary Coulomb 1 in the form of free ions, the energy ( 33.97 ± 0.05) in the air J to be applied for the generation of the charge quantity. This corresponds to an ion dose of about a dose of energy. The following relationship applies:

With f: = correction factor for the determination of absorbed doses in different absorption materials.

Units

The SI unit of absorbed dose is the gray.

Obsolete is the unit wheel ( rd).

Absorbed dose rate

The SI unit is W / kg.

The physically correct term performance dose is not common.