Artificial radioisotopes in hydrological investigation

The application of artificial radioisotopes in the solution of hydrological problems is reviewed. The devices with sealed radioactive sources to measure sedimentary rock concentration brought by river flows in a suspended state to measure the thickness and density of sedimentations are developed. Radioactive indicators are another way of application of artificial radioactive isotopes. The need in such indicators is conditioned by a wide variability of appropriate parameters of water systems in time and space. Artificial radioactive indicators are widely used in the research of many problems of civil construction, connected with water. The limitations in the use of radioactive substances in many countries are an obstacle to a wider application of artificial radionuclides