ABSTRACT
Results of the theoretical (numerical) and experimental dosimetry approach for portable radio transmitters are considered. The simulation and measurement results are shown. A generic type of a portable radio transmitter operating in a very high frequency range was tested as an electromagnetic field source. The analysis of specific absorption rate distribution in the flat homogeneous phantom was carried out on the basis of a portable radio transmitter. The results have shown the admissible divergence between measurements and simulation. According to these results, the authors have come to the conclusion about using the complex dosimetry approach including experimental and numerical dosimetry.
Subject(s)
Electromagnetic Fields , Radiation Dosage , Radio Waves , Humans , Models, Theoretical , RadiometryABSTRACT
The results of portable radio-station "Radiy-301" electromagnetic fields (EMF) emission measurement and specific absorption rate data evaluation has shown that workers' exposure EMF levels may elevate hygienic norms and hereupon can be health risk factor. Possible way of portable radio-station EMF dosimetry enhancement by means of domestic and international approaches harmonization is considered.
Subject(s)
Electromagnetic Fields/adverse effects , Radio Waves/adverse effects , Radio/standards , Radiometry/methods , Wireless Technology/standards , Inventions , Maximum Allowable Concentration , Radio/instrumentation , Radiometry/instrumentation , Radiometry/standards , Wireless Technology/instrumentation , Workplace/standardsABSTRACT
The article presents results and prospects of studies on problem of unfavorable effects caused by electric and magnetic fields on human health, and working out hygienic regulation of the factor in occupational and ambient surroundings.
Subject(s)
Electromagnetic Fields/adverse effects , Environmental Monitoring/methods , Occupational Diseases , Occupational Exposure , Workplace/standards , Cell Phone , Humans , Occupational Diseases/etiology , Occupational Diseases/prevention & control , Occupational Exposure/adverse effects , Occupational Exposure/prevention & control , Occupational Health/legislation & jurisprudence , Occupational Health/standardsABSTRACT
Given growing computational resources, radiofrequency electromagnetic field dosimetry is becoming more vital in the study of biological effects of non-ionizing electromagnetic radiation. The study analyzes numerical methods which are used in theoretical dosimetry to assess the exposure level and specific absorption rate distribution. The advances of theoretical dosimetry are shown. Advantages and disadvantages of different methods are analyzed in respect to electromagnetic field biological effects. The finite-difference time-domain method was implemented in detail; also evaluated were possible uncertainties of complex biological structure simulation for bioelectromagnetic investigations.
Subject(s)
Radiation, Nonionizing/adverse effects , Radio Waves/adverse effects , Radiometry/methods , Radiometry/statistics & numerical data , Humans , Models, BiologicalABSTRACT
The modern experimental radiofrequency electromagnetic field dosimetry approach has been considered. The main principles of specific absorbed rate measurement are analyzed for electromagnetic field biological effect assessment. The general methodology of specific absorbed rate automated dosimetry system applied to establish the compliance of radiation sources with the safety standard requirements (maximum permissible levels and base restrictions) is described.
Subject(s)
Radio Waves , Radiometry , Calibration , Dose-Response Relationship, Radiation , Humans , Phantoms, Imaging , Radio Waves/adverse effects , Radio Waves/classification , Radiometry/instrumentation , Radiometry/methods , Relative Biological EffectivenessABSTRACT
The comparative analyze of specific absorption rate dosimetric evaluation and electromagnetic field levels by portable radio transmitters are shown. In paper there are divergence of Russian and international methodological approaches as hygienic assessment for hand-handle system communication.
Subject(s)
Electromagnetic Fields/adverse effects , Radio Waves/adverse effects , Radio/standards , Radiometry/methods , Wireless Technology/standards , Cell Phone/standards , Humans , Maximum Allowable Concentration , Radio/instrumentation , Russia , Wireless Technology/instrumentationABSTRACT
Theoretical and experimental dosimetry can be used for adequate evaluation of the effects of radiofrequency electromagnetic fields. In view of the tough electromagnetic environment in aircraft, pilots' safety is of particular topicality. The dosimetric evaluation is made from the quantitative characteristics of the EMF interaction with bio-objects depending on EM energy absorption in a unit of tissue volume or mass calculated as a specific absorbed rate (SAR) and measured in W/kg. Theoretical dosimetry employs a number of computational methods to determine EM energy, as well as the augmented method of boundary conditions, iterative augmented method of boundary conditions, moments method, generalized multipolar method, finite-element method, time domain finite-difference method, and hybrid methods combining several decision plans modeling the design philosophy of navigation, radiolocation and human systems. Because of difficulties with the experimental SAR estimate, theoretical dosimetry is regarded as the first step in analysis of the in-aircraft conditions of exposure and possible bio-effects.
Subject(s)
Electromagnetic Fields , Radiometry/methods , Electromagnetic Radiation , Humans , Models, Biological , Radiation Dosage , Radiometry/instrumentation , Radiometry/standardsABSTRACT
The authors consider topics of evaluating electromagnetic factors on workplace of medical personnel in physical therapy office, specify adequate method to define occupational risk, based on data of hygienic and timing studies.