Application of radionulide as a tracer to study soil erosion is a hot spot in the world.~7Be is an environmental or fallout radionulide with a half-life of 53.3 days,which confirmed its particular trace value.The authors introduced ~7Be origin source,fallout characteristics,forms in soil particles,and presented quantitative estimate model of soil erosion rate by using ~7Be as a tracer.The comments on using ~7Be as tracer for soil erosion research in China are presented.
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