Wet deposition and soil content of Beryllium - 7 in a micro-watershed of Minas Gerais (Brazil).

Beryllium-7 (Be) is a natural radionuclide of cosmogenic origin, normally used as a tracer for several environmental processes; such as soil redistribution, sediment source discrimination, atmospheric mass transport, and trace metal scavenging from the atmosphere. In this research the content of Be in soil, its seasonal variation throughout the year and its relationship with the rainfall regime in the Mato Frio creek micro-watershed was investigated, to assess its potential use in estimating soil erosion. The Be content in soil shows a marked variation throughout the year. Minimum Be values were observed in the dry season (from April to September) and were between 7 and 14 times higher in the rainy season (from October to March). The seasonal oscillations in Be soil content could be explained by the asymmetric rainfall regime. A highly linear relationship between rainfall amount and Be deposition was observed in rain water. A good agreement between Be soil content and Be atmospheric deposition was noticed, mainly in wet months. Be penetration in soil reaches a 5 cm depth, this could be explained by the soil type in the region. The soils are Acrisol type, characterized by low pH values and clay illuviation in deeper layers of the soil. In some regions of Brazil special attention should be paid if this radionuclide will be used as soil erosion tracer, taking into account the soil origin and its particular properties.