n.放射指示剂(放射示踪物)

The extraction and separation of uranium from lead and bismuthwith TBP-benzene was studied by radiotracer technique. 用放射性示踪法研究了TBP-苯体系对铀和铅、铋的萃取分离。

The bone sintigraphy revealed significant accumulation of radiotracer in the left ureter. 核医骨骼扫描影像发现在左侧输尿管有明显放射活性聚集。

All of the women underwent mammography and MBI.The radiotracer used in the trial was supplied by the manufacturer. 这些妇女都接受乳房摄影和MBI，试验中使用的放射性示踪剂由制造商提供。

The results showed that the accuracy were high and the relative error was small and the effects were good,compared with radiotracer method. 结果表明:采用称重法测定准确度高,相对误差小,效果好,与示踪剂法所测结果相近。

The most commonly used PET radiotracer is fluorodeoxyglucose (FDG), a radiolabeled form of glucose, which is consumed more aidly by tumors than by normal tissue. 最常用的PET放射示踪迹为氟脱氧葡萄糖（FDG），葡萄糖的放射示踪形式，在肿瘤组织中较正常组织消耗更快。