SAR(Specific Absorption Rate)

SAR(Specific Absorption Rate)

Specific absorption rate (SAR) is a measure of the rate at which energy is absorbed by the 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.

As a two way radio, cell phone need to emit some electromagnetic radiation to enable them to connect to nearest base station. To protect the user from excessive radiation FCC has made a standard for cell phone radiation. This standard is called SAR.

SAR value for Different countries 

• U.S.A = 1.6W/KG
• U.K = 2.0W/KG
• INDIA = 1.6W/KG
• Australia = 1.6W/KG

*less value of SAR less effect on human body.

Effects on human body

• Cell phone users had an increased risk of malignant gliomas.
• Tumors are more likely to occur on the side of the head that the cell handset is used.
• One hour of cell phone use per day significantly increases tumor risk after ten years or more.
• Link between cell phone use and a higher rate of acoustic neuromas.

Precautionary measures and health advisories

• Use hands-free to decrease the radiation to the head.
• Keep the mobile phone away from the body.
• Do not use telephone in a car without an external antenna.
• While sleeping do not keep mobile near you