The object of research. The functional state of the nervous system, blood and immune systems of white rats that were exposed to magnetic fields - 50 Hz.
The aim of research was to study the nature of the magnetic field - 50 Hz on behavioral, he-matological and immunological parameters of experimental animals for further use of the data for substantiation of appropriate hygienic standards for the population.
For the biological experiments has been used Rays system (MOS-50), which allow to approx-imate the laboratory to real experimental conditions observed in the locations of cable lines, which are the sources of the magnetic field - 50 Hz. The research found that the magnetic field - 50 Hz causes changes in behavioral reactions of animals. Two different states of the central nervous system to influence MP-50 Hz – activation (excitation) and inhibition (suppression) were identified. It is proved that the MP-50 Hz depending on its level and the duration of effect on peripheral blood com-position. It is detected increase in the absolute number of leukocytes, lymphocytes in MP levels 30, 60, 90 mkTl. The level of hemoglobin in the blood and the average concentration in red blood cells under the influence of a magnetic field - 50 Hz suffered significant decline throughout the experiment (4 months). It is shown that the changes increase with increasing levels of MP. According to the re-sults of immunological studies found that indicators of agglomeration of leukocytes by the action of the MP-50 Hz is not much different from the control. This indicates a lack of sensitization of animals to MP-50 Hz. In general, the magnetic field - 50 Hz at different levels of its load on the body response is characterized by the features of the various systems of the body, depending on the duration of the current level and MP. These experimental results suggested to use when justifying the magnetic field of hygienic standards for the population.