The chemical compositions of the Ningqiang carbonaceous chondrite matrix and a dark rim are analysed with instrumental neutron activation method.

采用仪器中子活化方法分析了宁强碳质球粒陨石基质及暗色边化学成份。

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Yields of neutron generators have been measured by the iron foil neutron activation method and a long counter separately. The methods and results are given.

用铁片活化法和长计数管测量中子发生器的中子产额，给出了测量方法和结果。

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In the paragraph of the method of using artificial tracer, there is the explanation about the tracer technology of neutron activation analysis and the method of Lanthanide-DTPA tracer.

在人工示踪法中叙述了中子活化示踪沙技术和稀土元素- DTPA螯合物示踪法。

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