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宇宙线散落核素7Be具稳定的物质来源和53．3天的半衰期，提供了示踪环境微粒季节性迁移的必要条件；其在土粒中主要存在于Fe—Mn氧化物及有机质结合相，适应于季节性微粒迁移示踪；它在表土层中的垂直分布特征提供了示踪微粒季节性迁移的充分条件。7Be在表土层中的累计值、表观比活度、最大渗透深度及相对侵蚀（或堆积）速率是土粒迁移的示踪参数。
The cosmic ray scattered nuclei 7Be has a stable source of matter and a half-life of 53.3 days, which provides the necessary conditions for the seasonal migration of particles in the trace environment. It mainly exists in the Fe-Mn oxides and the organic phase, Adapted to seasonal particle migration tracing; its vertical distribution in the topsoil provides sufficient conditions for the seasonal migration of tracer particles. The cumulative value of 7Be in the topsoil, apparent specific activity, maximum penetration depth, and relative erosion (or accumulation) rates are tracer parameters for soil particle migration.