dosage
/ˈdəʊsɪdʒ/noun
1- the size or frequency of a dose of a medicine or drug（药的）剂量; 服法：
a dosage of 450 milligrams a day
每日450毫克的剂量
mass noun there are recommendations about dosage in elderly patients.上有老年患者服用剂量的介绍。
1.1
- a level of exposure to or absorption of ionizing radiation（受到或吸收的电离辐射的）剂量。