What is SAR Value and what are its safety limits? How does mobile SAR value affect our health?


What is SAR Value and what are its safety limits? How does mobile SAR value affect our health?

The full form of  SAR value ? (SAR) Specific Absorption Rate. It is the 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.
SAR measures presentation to fields between 100 kHz and 10 GHz (known as radio waves). It is normally used to gauge control consumed from cell phones and amid MRI filters. The esteem will depend vigorously on the geometry of the piece of the body that is presented to the RF vitality, and on the correct area and geometry of the RF source. In this way tests must be made with every particular source, for example, a cell phone show, and at the proposed position of utilization

If you dont know SAR value of your smartphone, click here to view list of all smartphones with SAR value

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.
SAR for electromagnetic energy can be calculated from the electric field within the tissue as explained in above picture.

How to calculate SAR value of all mobile phones

SAR for electromagnetic energy can be calculated from the electric field within the tissue as: When measuring the SAR because of a cell phone the telephone is set against a portrayal of a human head (a “SAR Phantom”) in a discussion position. The SAR esteem is then measured at the area that has the most astounding ingestion rate in the whole head, which on account of a cell phone is frequently as near the telephone’s radio wire as would be prudent. Estimations are made for various positions on the two sides of the head and at various frequencies speaking to the recurrence groups at which the gadget can transmit. Contingent upon the size and capacities of the telephone, extra testing may likewise be required to speak to use of the gadget while put near the client’s body as well as furthest points. Different governments have characterized most extreme SAR levels for RF vitality radiated by cell phones:

• United States: the FCC requires that telephones sold have a SAR level at or beneath 1.6 watts for each kilogram (W/kg) assumed control over the volume containing a mass of 1 gram of tissue that is retaining the most flag.

how to calculate sar value
How to calculate SAR value

• European Union: CENELEC determine SAR constrains inside the EU, following IEC principles. For cell phones, and other such hand-held gadgets, as far as possible is 2 W/kg arrived at the midpoint of over the 10 g of tissue retaining the most flag (IEC 62209-1).

• India: India changed from as far as possible to as far as possible for portable handsets in 2012. Not at all like the US, India won’t depend  exclusively on SAR estimations gave by producers; arbitrary consistence tests are finished by an administration run Telecommunication Engineering Center (TEC) SAR Laboratory on handsets and 10% of towers. All handsets must have a hands free mode.

SAR esteems are intensely reliant on the measure of the averaging volume. Without data about the averaging volume utilized, correlations between various estimations can’t be made. In this way, the European 10-gram evaluations ought to be looked at among themselves, and the American 1-gram appraisals should just be thought about among themselves. To check SAR on your cell phone, audit the

 What is Limit of  SAR Value in India?

Sar Value Limit: The Inter-Ministerial Committee on EMF Radiation set up by the Ministry of Communications and Information Technology had recommended stricter SAR limits (2 watt for each kg) for versatile handsets.

While recognizing the affect ability of well-being related impacts of radiation discharges from versatile towers and the current concern raised by World Health Organization, the Indian Government has chosen to set the new SAR points of confinement to 1.6 watt for each kg. This would make the Indian models nearer to the US norms recommended by the FCC (Federal Communication Commission) where the passable SAR levels are set at or beneath 1.6 watt for every kg assumed control over a volume containing a mass of 1 gram of tissue.

How is SAR harmful for Human Body?

 A high level of SAR is known to have ill effects on humans.

So how safe are mobile phones under high SAR Value?

There is concern at the moment over the use of cellular phones and their possible health implications. All the research is inconclusive so the bottom line is, cellular phones may be a potential health hazard.
Different cell-phone models emit different amounts of radiation, so one way to reduce your exposure is to purchase a cell phone with a lower SAR (specific absorption rate), a number that indicates how much radiation is absorbed by the human body when the handset is being used at maximum power.
The FCC requires cell phone manufacturers to ensure that their phones comply with these objective limits for safe exposure. Any cell phone at or below these SAR levels (that is, any phone legally sold in India) is a “safe” phone, as measured by these standards. The FCC limit for public exposure from cellular telephones is an SAR level of 1.6 watts per kilogram (1.6 W/kg).

What are the Parameters that can affect SAR?

Parameters that can affect SAR include:

  • Physical orientation to person (held-to-ear, held-to-face, belt-clip, lap-held, etc.)
  • Types of radio service (cellular, PCS, LMR, WLAN, etc.)
  • Changes to transmitter, antenna (extracted/retracted) or accessories (clips, batteries, etc.)
  • Types of modulations (CDMA, GMSK, TDMA, AMPS, etc.)
  • RF power level (in Watts or mW)

Leave a Reply

Your email address will not be published. Required fields are marked *