Аннотация:The work includes 65 pages, an introduction, five main chapters, and a conclusion. The first chapter is dedicated to the study object (Lake Xingkai) and radioactive sources that can affect to the investigated territory. Second part of paper fully describes the different radio analytical methods than can be used or the contamination estimations. In the results and discussion part of the paper, student shows the real measurements results. Also, the laboratory experiment of sorption 137Cs, 90Sr and 239,240Pu presented.