What is SAR Value?

                   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).                                                                                                                                                                                                                       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).                                                                                                                                                                                                                     Calculation:       SAR for electromagnetic energy can be calculated from the electric field within the tissue as:

${\displaystyle {\text{SAR}}={\frac {1}{V}}\int _{\textrm {sample}}{\frac {\sigma (\mathbf {r} )|\mathbf {E} (\mathbf {r} )|^{2}}{\rho (\mathbf {r} )}}d\mathbf {r} }$                                         

where

${\displaystyle \sigma }$ is the sample electrical conductivity

${\displaystyle E}$ is the RMS electric field

${\displaystyle \rho }$ is the sample density

${\displaystyle V}$ is the volume of the sample

SAR measures exposure to fields between 100 kHz and 10 GHz (known as radio waves). It is commonly used to measure power absorbed from mobile phones and during MRIscans. The value will depend heavily on the geometry of the part of the body that is exposed to the RF energy, and on the exact location and geometry of the RF source. Thus tests must be made with each specific source, such as a mobile phone model, and at the intended position of use.                                                                                                                                                                                                                                                                                                                                                                                      How To Check SAR Value :               Any smartphone at or below this SAR levels is “safe” to use. You can check Radiation level in terms of SAR of your smartphone by dialing a USSD code *#07#, if results shows SAR below 1.6 watts per kilogram (1.6 W/kg) then it is OK otherwise you are advised to change your smartphone immediately.       

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