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根据土坝质量控制的需要，试制成功放射性同位素测土密度仪。文中介绍了试制经过，基本 原理，仪器的设计和制造，试验方法及成果分析等内容。
According to the needs of earth dam quality control, the successful trial of radioactive isotope soil testing density meter. This paper describes the trial after the basic principles of the design and manufacture of equipment, test methods and results analysis.