费钱

• Compared with the destructive assay ( da ) , nda has some obvious advantages : it is easy to make measurement automatically without sampling and changing the physical and chemical state of nuclear material , low cost , less operator exposure of radiation , much faster than chemical analysis and no hazards and wastes generated
  与化学分析即破坏性分析( da ： destructiveanalysis )相比， nda分析具有不破坏样品、容易实现自动化、快速、简便、费用低廉和不产生放射性废物等优点。 nda核标准样品的制备既费钱又费时。