Permitted Levels of Electromagnetic Radiation, According the EUROPEAN UNION Standards

Arsov, Dimitar (2010) Permitted Levels of Electromagnetic Radiation, According the EUROPEAN UNION Standards. Masters thesis, University Goce Delcev Shtip.

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Abstract

Definitions For purposes of this recommendation, the term electromagnetic fields (EMF) includes static fields, extremely low frequency (ELF) fields and radio frequency (RF) fields, including microwaves, encompassing the frequency range from 0 Hz to 300 GHz. Basic restrictions and referent levels The restrictions are based on research about the effects of electric fields on health. There is a difference between basic restrictions and referent levels. Basic restrictions Depending on the frequency, the following physical variables (dissymmetrical / exposymmetrical) are used to determine the fundamental limitations of electromagnetic fields: - Between 0 and 1 Hz basic restrictions are provided for magnetic flux density of static magnetic fields (0 Hz) and current density fields varying periods up to 1 Hz, to prevent effects on the cardiovascular and central nervous system, - Between 1 Hz and 10 MHz basic restrictions are provided for current density to prevent effects on the functions of the nervous system, - Between 100 kHz and 10 GHz basic restrictions on SAR are provided to prevent heat stress on the body and excessive local heating of tissues. In the range 100 kHz to 10 MHz, are foreseen limitations of the current density and SAR, - Between 10 GHz and 300 GHz basic restrictions on the density of energy is provided to prevent heating of tissue near the surface of the body. Reference levels The reference levels for exposure are used for making a comparison of the values of measured variables. Respect of all recommended referent levels ensures compliance with basic restrictions. If measured values are higher than referent levels, it follows that the basic restrictions are exceeded. In this case, you need to measure whether the value of exposure is below the basic restrictions. The reference levels for limiting exposure arising from the basic constraints and thus provides maximum protection. Review of referent levels are given in Table 2.2 and 2.3. Generally, the referent levels are intended to be an average across the body dimensions of the exposed person, but with the condition that the basic restrictions on localized exposure are not exceeded. In certain situations the use of referent levels are not appropriate as the true exposure to localized the radiation, as the example with the mobile phone and a human head. In such cases, it is necessary to conclude a direct opinion and observe the localized primary limitation.

Item Type: Thesis (Masters)
Subjects: Engineering and Technology > Environmental engineering
Divisions: Faculty of Natural and Technical Sciences
Depositing User: Sladzana Mitrovska
Date Deposited: 06 Nov 2012 15:09
Last Modified: 13 Nov 2012 14:15
URI: http://eprints.ugd.edu.mk/id/eprint/509

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