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本文介绍了用同位素测并测试尾矿坝原位密度的原理和方法，并将测试结果与现场取样结果进行了比较，表明同位素方法是可靠的．
This paper introduces the principle and method of testing and measuring the in-situ density of tailings dam with isotope, and compares the result of the test with the result of on-site sampling. It shows that the isotope method is reliable.