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1. 少量的很容易被发现的物质,可用于跟踪和量化对于其他普通检测方式不可见或不能检测的材料流动或生物运动。 2. 一种含有同位素元素的物质,其少量可能被纳入样本,用以跟踪化学、生物或物理过程中该元素的过程,此时同位素也与较大的样本一起参与过程。示踪剂可能是放射性的,在这种情况下观测是通过测量放射性而实现的。
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