[en] River water from all over Malaysia had been collected and measured for the radionuclides content of Cs-137, Ra- 228 and K-40. Out of the 1,375 sampels studied, no Cs-137 was found in sampels, while 9 river sampels (0.65 %) contained Ra-228 and K-40 exceeding LPTA clearance levels of 1 Bq/ L and 10 Bq/ L, respectively, with the maximum value of 1.40 Bq/ L found for Ra-228 and 47.75 Bq/ L for K-40. For Ra-228, from the nine rivers, four rivers located in Pahang, two in Johor and one each from Kelantan, Negeri Sembilan and Sabah. Meanwhile, for K- 40, three rivers were from Johor and Sarawak, respectively, and one river each from Perak, Malacca and Penang. (author)