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Concentration of natural radionuclides (Ra-226, Ra-228 and K-40) in samples of catchment surface soil and river sediment at three (3) monitoring stations along the middle reach of Langat River were identified using HPGe detector. Spatial and temporal variations of the radioactivity at 3-month interval were analysed over a period of 9 years. Activity concentrations show sign of long-term fluctuation for K-40, and short-term fluctuation for Ra- 226 and Ra-228. Correlation of Ra-226 and Ra-228 is very strong for downstream stations, but weak for the upstream station. Meanwhile, their correlation with K-40 varies considerably possibly due to the high potassium solubility.

Correlation of Natural Radioactivity in Surface Soil and River Sediment along the Middle Reach of Langat River