A(uCn/p)m/(uCn/p)A为某种介质对空气的质能吸收系数之比 

B(uCn/p)m/(uCn/p)A为某种介质对空气的质能吸收本能之比 

C(uCn/p)m/(uCn/p)A为水对空气的质能阻止本领之比 

D(uCn/p)m/(uCn/p)A为介质中吸收剂量与照射质量的转换系数 

E(uCn/p)m/(uCn/p)A为水中吸收剂量与照射剂量的转换系数