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D. Bernatavičius et al. / Medical Physics in the Baltic States 7 (2009) 102 - 105 quality, or it might be similar to peak value if there is an obstacle between cell phone and tower. Electric field strength is approximately the same for both waiting for answer or conversation modes. Meanwhile sending SMS and switching on the phone emits similar signal in magnitude, shape and duration, which is around 5s. Intensity of the signal doesn‘t depend on a distance from the tower in the highly populated areas, where towers are close to each other and cover all territory uniformly. Considering obtained data it is to conclude, that keeping mobile phone at the distance from the body when sending SMS, switching on the phone and waiting for the answer it is possible to avoid most of radiation dose. 105 5. References 1. http://www.who.int/pehemf/about/WhatisEMF/en/index4.html 2. Celik O., Hascalik S. Effect of electromagnetic field emitted by cellular phones on fetal heart rate patterns. European Journal of Obstetrics & Gynecology and Reproductive Biology 112 (2004) 55–56 3. Curcio G., Ferrara M., Moroni F. D’Inzeo G., Bertini M. De Gennaro L. Is the brain influenced by a phone call? An EEG study of resting wakefulness. Neuroscience Research 53 (2005) 265–270 4. Khurana V, Teo Ch., Kundi M., Hardell L, Carlberg M. Cell phones and brain tumors: a review including the long-term epidemiologic data. Surgical Neurology 72 (2009) 205–215
MEDICAL PHYSICS IN THE BALTIC STATES 7 (2009) Proceedings of International Conference “Medical Physics 2009” 8 - 10 October 2009, Kaunas, Lithuania ELECTROMAGNETIC RADIATION AT COMPUTERIZED WORKPLACES AND THE IMPACT OF ELECTROMAGNETIC FIELD ON THE HUMAN HEALTH Pranas KANAPECKAS*, Stasys MACIULEVIČIUS*, Alfredas OTAS*, Algis VALYS ,Vytautas PETRAUSKAS*, Neringa VAIČIŪNAITĖ* *Kaunas University of Technology Abstract: Increasing amount of electrical equipment at the work places and at home causes increasing impact of electrical and magnetic fields on human health. Although the impact of low frequency electromagnetic fields over human health remains not properly explored and comprehensive evaluated, surrounding electromagnetic fields in the office environment do not contribute to the well fare being of the office workers. The impact of electromagnetic fields over human health is discussed in this investigation. Special attention is paid to industrial frequency electromagnetic field and its harming influence. Keywords: Electromagnetic field, health problems, Video Display Units 1. Introduction The statistics shows rapid growth of the computers number in Lithuania. Also the amount of persons working with computer is growing too. According to the data of LIKS (Lithuania Computer Society) there were approximately 230.000 computers installed in Lithuania at the beginning of new millennium. The number of hours spent on computer is tremendous – it is approximately 65.000 hours per career. Hours under lightness, limited work space and insufficient ventilation in some cases could cause serious health problems. Analysis of recent publications concerning electromagnetic field impact over human body shows that the surrounding electromagnetic field could be a significant problem and extra attention should be paid to this. Industrial frequency harming effects were investigated very carefully in offices, workplaces and at home. Results of electromagnetic fields measurements at computerized workplaces are presented in Table 1[1]. The results of measurements show that metallic constructions such as, metal pipes and steel frameworks makes a big influence to intensity of magnetic field. Engineers and network administrators should pay attention to these effects by reducing electromagnetic field as much as possible and creating safe and comfortable workplaces. World Health Organization (WHO) published the information about the influence of low frequency fields on human body in the report “Electromagnetic fields and public health”[2]. It was shown that industrial frequency magnetic fields having magnetic flux density higher than 0,3- 0,4 μ T could become a cancerogenic factor for workers during the long working hours [2]. 106 Table 1. Results of measuring of the electromagnetic filed measurements [1] Persentage Magnetic Sources of in flux (50Hz) electromagnetic workplaces density radiation (%) ( μT) Network cables 47,4 53,3 Comutators (switch) 22,8 33,6 Steel frames 15,6 15,2 Transformers 8,4 8,8 Electricity network 3,5 1,2 Direct curent sources 1,3 3,0 According to the opinion of the World Health Organization, cancer, Alzheimer’s disease, Parcinson’s disease, mental problems even the growing number of suicides are caused by electromagnetic field harming influence. Due to the possible health risks it is highly recommended to reduce electromagnetic field radiation at all human living spaces. Another publication [3] revealed that the magnetic field of industrial frequency (50 Hz) having flux density 0,2 -0,4 μ T could be the main factor causing the appearance of the blood cancer. Besides, the risk is twice higher for a young people and children. Permissible levels of electromagnetic irradiation from the industrial electromagnetic field (50 Hz) are presented in a Table 2.
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2009 PROCEEDINGS OF THE 7 th INTERN
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