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Explicatia SAR - Specific absorption rate
SAR (rata absorbţiei specifice de energie ) reprezintă cantitatea de energie corespunzătoare undei de radiofrecvenţă absorbită de corpul uman în timpul folosirii telefonului mobil, valoarea limită admisă a SAR fiind de 2W/kg. Cu cat valoare SAR emisa de catre telefon este mai mica, cu atat radierea la care este supus corpul uman este mai scazuta.
“Conform Ordinului de Ministru nr.125 din 14 aprilie 2003, importul sau comercializarea de telefoane mobile sunt permise numai după includerea în instrucţiunile de utilizare ale aparatului şi afişarea la locul de vânzare a următoarelor categorii de informaţii:
Rata absorbţiei specifice de energie (SAR) care reprezintă cantitatea de energie corespunzătoare undei de radiofrecvenţă absorbită de corpul uman în timpul folosirii telefonului mobil;
– valoarea limită admisă a SAR, respectiv 2W/kg;
– valoarea SAR a modelului de telefon mobil respectiv;
-specificaţii referitoare la expunerea consumatorului la câmpuri electromagnetice, în condiţiile prevăzute în art. 11 din Hotărârea Guvernului nr. 88/2003 privind echipamentele radio şi echipamentele terminale de telecomunicaţii şi recunoaşterea mutuală a conformităţii acestora.”
De ce nu se tine cont de aceste precizari? Sa fie valorile mai mari decat este normal?
Radiatia emisa de telefoanele mobile poate interfera cu unele cardiostimulatoare, pot aparea alterari sau distrugeri la nivelul ADN-ului, afecteaza buna functionare a celulelor si ma oresc aici dar ar mai fi multe de spus la acest capitol.
Principalele simptome ce pot aparea din cauza radiatiei emise de catre telefonul mobil:
– oboseala, dureri de cap, usturimi ale pielii, senzatia de cald in jurul urechii, etc.
Sursa androidro.ro
Mai multe detalii pe:
https://en.wikipedia.org/wiki/Specific_absorption_rate
Specific absorption rate (SAR) is a measure of the rate at which energy is absorbed by the human body when exposed to a radio frequency (RF) electromagnetic field; although, it can also refer to absorption of other forms of energy by tissue, including ultrasound. It is defined as the power absorbed per mass of tissue and has units of watts per kilogram (W/kg).
SAR is usually averaged either over the whole body, or over a small sample volume (typically 1 g or 10 g of tissue). The value cited is then the maximum level measured in the body part studied over the stated volume or mass.
Calculation
SAR for electromagnetic energy can be calculated from the electric field within the tissue as:is the sample electrical conductivity
is the RMS electric field
is the sample density
is the volume of the sample
Mobile phone SAR testing
See also: Mobile phone radiation and health
When measuring the SAR due to a mobile phone the phone is placed at the head in a talk position. The SAR value is then measured at the location that has the highest absorption rate in the entire head, which in the case of a mobile phone is often as close to the phone's antenna as possible. Various governments have defined maximum SAR levels for RF energy emitted by mobile devices:- United States: the FCC requires that phones sold have a SAR level at or below 1.6 watts per kilogram (W/kg) taken over the volume containing a mass of 1 gram of tissue that is absorbing the most signal.
- European Union: CENELEC specify SAR limits within the EU, following IEC standards. For mobile phones, and other such hand-held devices, the SAR limit is 2 W/kg averaged over the 10 g of tissue absorbing the most signal (IEC 62209-1).
- India: switched from the EU limits to the US limits for mobile handsets in 2012. Unlike the US, India will not rely solely on SAR measurements provided by manufacturers; random compliance tests are done by a government-run Telecommunication Engineering Center (TEC) SAR Laboratory on handsets and 10% of towers. All handsets must have a hands free mode.
MRI scanner SAR testing
For Magnetic Resonance Imaging the limits (described in IEC 60601-2-33) are slightly more complicated:Whole body SAR | Partial body SAR | Head SAR | Local SAR (a) | |||
---|---|---|---|---|---|---|
Body Region → | whole body | exposed body part | head | head | trunk | extremities |
Operating Mode ↓ | (W/kg) | (W/kg) | (W/kg) | (W/kg) | (W/kg) | (W/kg) |
Normal | 2 | 2 - 10 (b) | 3.2 | 10 (c) | 10 | 20 |
1st Level Controlled | 4 | 4 - 10 (b) | 3.2 | 20 (c) | 20 | 40 |
2nd Level Controlled | >4 | >(4 - 10) (b) | >3.2 | >20 (c) | >20 | >40 |
Short duration SAR | The SAR limit over any 10 s period shall not exceed two times the stated values |
- Note: Averaging time of 6 minutes.
(b) The limit scales dynamically with the ratio "exposed patient mass / patient mass":
NORMAL OPERATING MODE: Partial body SAR = 10 W/kg – (8 W/kg * exposed patient mass / patient mass)
FIRST LEVEL CONTROLLED OPERATING MODE: Partial body SAR = 10 W/kg – (6 W/kg * exposed patient mass / patient mass)
(c) In cases where the orbit is in the field of a small local RF transmit coil, care should be taken to ensure that the temperature rise is limited to 1 °C.
Criticism
SAR limits set by law don't consider that the human body is particularly sensitive to the power peaks or frequencies responsible for the microwave hearing effect. Frey reports that the microwave hearing effect occurs with average power density exposures of 400 μw/cm2, well below SAR limits (as set by government regulations).Notes:
In comparison to the short term, relatively intensive exposures described above, for long term environmental exposure of the general public there is a limit of 0.08 W/kg averaged over the whole body.[3] A whole-body average SAR of 0.4 W/kg has therefore been chosen as the restriction that provides adequate protection for occupational exposure. An additional safety factor of 5 is introduced for exposure of the public, giving an average whole-body SAR limit of 0.08 W/kg.
FCC advice
The FCC Guide, "Specific Absorption Rate (SAR) For Cell Phones: What It Means For You," after detailing the limitations of SAR values, offers the following "bottom line" editorial:"ALL cell phones must meet the FCC’s RF exposure standard, which is set at a level well below that at which laboratory testing indicates, and medical and biological experts generally agree, adverse health effects could occur. For users who are concerned with the adequacy of this standard or who otherwise wish to further reduce their exposure, the most effective means to reduce exposure are to hold the cell phone away from the head or body and to use a speakerphone or hands-free accessory. These measures will generally have much more impact on RF energy absorption than the small difference in SAR between individual cell phones, which, in any event, is an unreliable comparison of RF exposure to consumers, given the variables of individual use."