The problem of ensuring safety of electric and magnetic fields (EMF) of extremely low frequencies (ELF) is resulted from the development of the first low-frequency generators producing penetrating effect and causing negative biological outcomes. World power resources are doubling every 10 years, and ELF EMF are generated around by such sources. The number of sources on the scale of application, power and design diversity significantly exceeds those generating EMF in other frequency ranges. The population is exposed to 50 Hz ELF at work, in electric transport, in residential and public buildings, in residential areas. ELF EMF was found both to “pollute” the environment, be an environmental health risk factor, and affect negatively the health with potential long-term outcomes. Development of various methods and means of protection against the effect of ELF EMF remains relevant today. Limitation (regulation) of the effect of the factor both in terms of intensity and exposure is the most effective protection. Epidemiological studies to identify the relationship between exposure to ELF magnetic fields (MF) and carcinogenesis are on-going. A task panel group of research experts, established by WHO in 2005, conducted a routine procedure to assess health risks resulting from exposure to ELF MFs and, in particular, cancer and considered them to lack evidence. However, the significance of the data obtained was noted to be reduced due to procedural problems, potential systematic error of assessment. The problem remains unsolved. Research using various types of monitoring: social and hygienic, sanitary and epidemiological, is going on. Spatio-temporal monitoring of 50 Hz ELF MF in enclosed spaces of residential and public buildings, where a variety of equipment, devices, power supply systems, generating different MF levels, is an important area. The population is exposed to these conditions most of the day. Monitoring will allow assessing electromagnetic load at short-term and long-term exposures.
Introduction. In recent decades, there have been created powerful pulsed sources of electromagnetic radiation capable of generating and transmitting high peak signals with effective antennas. Wide-band and ultra-wide-band (NB, UWB) generator complexes in the frequency range from 0.5 Hz to 100 Hz, concentrating the energy in ultrashort pulses in duration, have become widespread. Most studies of the biological effects of these radiations are associated with their special purpose (directional action). Today, high-voltage pulsed radiation is widely used in such areas as radiolocation and navigation, radio communication, in semiconductor and composite technology, chemical compounds, medicine, and others. Biomedical aspects of ultra-wideband radiation pulses have not been studied enough. The issues of the safety and regulation for occupational exposure are considered. The studies of broadband electromagnetic pulses effect on outbred white mice during generator equipment testing were carried out in experimental conditions. Material and methods. Behavioral responses in the “open field” test, memory in a “T-shaped maze”, working capacity in “forced swimming” test were studied, as well the temperature response, electrostatic body potential and body mass were measured. The studies were implemented in an anechoic chamber. The antenna system of the high-voltage pulse generator enabled us to generate a uniform field having a volume sufficient for the group exposure. Pulse simulator was remote-controlled. The study covered three groups of animals exposed daily for 15, 30 and 60 minutes during five days and a control group. Animals were studied during and after expose periods. Results. Statistically significant changes were revealed in 30 and 60 minutes daily exposure to 100 kV / m voltage pulses, which evidences disturbances in behavioral responses, motor activity, memory, and work capacity. A decline in the electrostatic body potential was shown. Thermogenic effect was not seen. The pilot study findings prove the biological activity of broadband electromagnetic pulses in short-term experiment.
There were executed studies to assess the impact of broadband pulsed electromagnetic radiation on the central nervous system of white mice in test “open field”, “T-maze”, “Forced swimming”. The results of the study proved the influence of pulsed electromagnetic radiation on cognitive function. Experimental studies were performed in a shielded equipped semi-anechoic chambers with the remote control of the work of the simulator of broadband pulse EMT. At the end of the performed studies it was revealed that when exposed to broadband pulsed electromagnetic radiation into three groups of animals (exposure of 15, 30, 60 minutes) only in the group with exposure for 15 minutes there were no detected changes in behavioral responses. In the other two groups there were shown statistically significant changes in indices of the horizontal and vertical locomotor activity. The results confirm the possibility of separation between the processes of inhibition and excitation under the influence of EMF of low intensity (non-thermal) on biological objects.
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