Dose
（重定向自Dosis）
Dose means quantity (in units of energy/mass) in the fields of nutrition, medicine, and toxicology. Dosage is the rate of application of a dose, although in common and imprecise usage, the words are sometimes used synonymously.
Dose can also mean quantity (in units of number/area) in the fields of Surface science and Ion implantation. See the definition of dose in ISO18115-1, term 4.173 (and compare the related definition of fluence in term 4.217 of the same Standard).