This paper was prepared to estimate soil erosion and sedimentation rate from different land use in the catchment areas using Fallout Radionuclides (FRNs). The FRNs widely used for soil erosion and sediment source tracing are 137Cs, 210Pb and 7Be. Therefore, these FRNs had been recognied as particularly indicates can be used to estimate from short-term to long-term the amount of soil erosion and sedimentation rates in the catchment during the period of the study. The study also found that both medium-term and long-term soil erosion rate is comparable to each other even though at different temporal scale. During the wet season, most sediment was stored in each catchment land use bore being transported out to the stream during the dry season. Whereas for short-term scale, large quantities of sediment are transported out of different land uses into the flow system. However, the results of this study will be discussed in more detail in this full paper. ? 2021. ASM Science Journal. All right.....

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This paper examines the 7Be penetration onto the soil surface within two seasons of different agricultural activity areas. This study was conducted during the wet and dry seasons in October 2015 until March 2016.Timah Tasoh is a catchment area located in Perlis State, Northern Peninsular of Malaysia and has been identified as the most suitable study site due to a small size of the catchment area. A total of sixteen core soil samples were taken over the course of the study using corer made of metal with a depth of 4cm each. All the results from this study site indicate that the 7Be penetration decreases exponentially decay in soil depth.The distribution of soil depth profile onto the soil surface or ho values for both seasons varied from 2.98 to 4.98 kgm-2 and from 3.57 to 5.57 kgm-2, respectively.Therefore, all the ho values of two seasons from this study are slightly higher from the results that have been reported by others. However, more extensive studies such as the addition of rese.....

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