ABSTRACT
We studied the biological effect of chronic exposure to multifrequency electromagnetic fields simulating the effects of 5G NR/IMT-2020 mobile communication systems. Male Wistar rats were exposed to 24-h radiation (250 µW/cm2) for 4 months. The exploratory activity of the animals and blood concentrations of ACTH and corticosterone were evaluated at the end of each month of exposure and 1 month after exposure. The results suggest that exposure to multifrequency electromagnetic field simulating the effects of 5G systems affected functional activity of the hypothalamus-pituitary-adrenal axis and was stressful in nature.
Subject(s)
Adrenocorticotropic Hormone , Electromagnetic Fields , Rats , Animals , Male , Rats, Wistar , Electromagnetic Fields/adverse effects , Adrenocorticotropic Hormone/pharmacology , Hypothalamo-Hypophyseal System/metabolism , Pituitary-Adrenal System/metabolism , CorticosteroneABSTRACT
In Russian Federation, absent regulation document for criteria and methods evaluating screening properties of protective means against radio frequency electromagnetic fields necessitates development of general principles and methods for indivual protective means testing. Findings are that indivual protective means testing are expedient with consideration of measurements in free space and evaluation of absorbed electromagnetic energy in tissue-equivalent phantoms. Screening coefficient should be assessed in several zones corresponding to location of human vital organs.
Subject(s)
Electromagnetic Fields/adverse effects , Environmental Health , Environmental Monitoring , Mass Screening/methods , Environmental Health/legislation & jurisprudence , Environmental Health/organization & administration , Environmental Monitoring/methods , Environmental Monitoring/standards , Government Regulation , Humans , Protective Devices/classification , Protective Devices/standards , Radio Waves/adverse effects , RussiaABSTRACT
It has been shown that a single exposure to 171 MHz electromagnetic field with 180 V/m electric field strength and 0.04 mW/kg specific absorption rate significantly alters the Na+/Ca2+ exchange in the isolated rat heart. It is assumed that enhancement of the Na+/Ca2+ exchange towards removing Ca2+ from the cardiomyocytes electromagnetic field exposure is a result of Ca2+ extraction from the sarcoplasmic reticulum and the increase of its intracellular level.
Subject(s)
Electromagnetic Fields , Heart/radiation effects , Myocytes, Cardiac/radiation effects , Radio Waves , Animals , Calcium/metabolism , Myocytes, Cardiac/metabolism , Organ Culture Techniques , Rats , Sarcoplasmic Reticulum/metabolism , Sarcoplasmic Reticulum/radiation effects , Sodium/metabolismABSTRACT
Results of theoretical (numerical) and experimental electromagnetic field dosimetry for homogeneous human head phantoms are considered. The simulation and measurement results are shown. This paper presents the results of Specific Absorption Rate (SAR) evaluation in the "special anthropomorphic model" of human head, when a source of electromagnetic radio frequency field is placed in front of the face. The minimal difference is shown between measurements and simulation results in Head Simulating Liquid, which makes it possible to conduct further brain tissue simulations. The investigations show that the type of electromagnetic field source and phantom form play an important part for SAR distribution.
Subject(s)
Electromagnetic Fields , Head/radiation effects , Phantoms, Imaging , Radiation Dosage , Radio Waves , Radiometry , Humans , Models, Theoretical , Radiometry/instrumentation , Radiometry/methodsABSTRACT
Nowadays, essential objective of hygienic evaluation of electromagnetic energy absorption of mobile radio-frequency devices is specification of new approach with consideration of russian and international regulation principles. This approach enables to ealuate correctly users' actual exposure conditions and consider energy absorption by human in near-field zone of the irradiation source. The work is aimed to study applicability of hypothesis on possible relations between magnetic part of electromagnetic field and specific absorbed capacity. This hypothesis is considered a basis for designing a new methodic approach to hygienic evaluation of individual mobile communication devices in near-field zone of the source. Analysis of the data obtained demonstrates that visible difference between suggested and classic methods decreases with higher frequency. Every studied source in its near-field zone can be characterized by optimal conditions for the suggested method usage with error less than 2 dB. The study results on relations between decreasing electromagnetic energy and specific absorbed capacity value make possible further improvement of methods controlling electromagnetic field levels in assessment of personal mobile radio communication devices.
