Arsov, Dimitar (2010) Permitted Levels of Electromagnetic Radiation, According the EUROPEAN UNION Standards. Masters thesis, University Goce Delcev Shtip.
Preview |
Text
magisterski_dimitar_b_arsov.pdf Download (2MB) | Preview |
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 Dimiskov |
| Date Deposited: | 06 Nov 2012 15:09 |
| Last Modified: | 13 Nov 2012 14:15 |
| URI: | https://eprints.ugd.edu.mk/id/eprint/509 |
Actions (login required)
 |
View Item |