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# Formula Ion Dose Mass    Charge

## Ion dose

Unit
A substance is irradiated with radioactive radiation. The ion dose $$J$$ [C/kg] is the amount of charge (per mass) of the irradiated substance created by the ionization. The ion dose thus tells how strongly the radiation can ionize a substance.

## Mass

Unit
Mass exposed to radioactive radiation.

## Charge

Unit
Amount of charge created by ionization of the irradiated substance.