同位素示踪技术的发展为环境学的研究提供了非常有效的手段。近年来,可活化稳定同位素示踪技术得到广泛应用。在水扩散试验中,同位素示踪的一个重要问题是选择合适的示踪剂,它必须具备空白本底低、受主元素干扰小、灵敏度高和对生态系统不造成有害污染等条件。常用示踪元素有In、Eu、Co、La、Ce、Sm、Dy、Lu、Sc和Ir等。为此,以江水和自来水为背景在待选的In、En、Dy和Lu四种示踪剂中作了中子活化分析,以选择合适的示 The development of isotope tracing technology has provided a very effective means for environmental studies. In recent years, activatable stable isotope tracing techniques are widely used. In the water diffusion test, an important issue for isotope tracing is the selection of a suitable tracer, which must have low blank background, low interference from the host element, high sensitivity and no harmful pollution to the ecosystem. Common trace elements are In, Eu, Co, La, Ce, Sm, Dy, Lu, Sc and Ir. To this end, in the river and tap water as the background in the choice of In, En, Dy and Lu four tracers made of neutron activation analysis to select the appropriate show