RF Exposure and SAR
While the first idea and countless discussions leading to the birth of Cellraid date back much longer in time, Cellraid as a company itself was incorporated in April 2014. This is when founders of Cellraid formed a combined vision to provide everyone an affordable and high quality product that allows them to monitor and reduce the RF exposures from modern day mobile phones and other mobile devices.
Cellraid Ltd is based in Oulu Finland – a city with long history of mobile phone technology. This gives us unique access to best-in-world resources and partners that help us to build the high quality products that we want to give to our customers.
Radio frequency (RF) Emission refers to electromagnetic fields with frequencies between 3 kHz and 300 GHz.
Mobile devices, like cell phones and tablets, generate the major part of RF emission people are exposed to. They emit always when ‘talking’ to the network towers. Classically, the most common cause for emission exposure has been talking on the phone. However, in the modern world of smartphones and tablets, as well as fast network connections (4G, 5G), the data traffic is generating a major part of the emission exposure. Social applications, email and other synchronisations are updated all the time, causing the ‘invisible’ emission people are not aware of and thus cannot be in control of.
Towers and Wifi base stations constitute background emission surrounding us, and they emit all the time. However, they are not as significant sources of emission exposure as the mobile devices, unless one is located in a very close proximity to them.
The effect of mobile phone emission on human health is a subject of interest and study/research.
In 2011 IARC (International Agency for Research on Cancer) classified mobile phone radiation as Group 2B – possibly carcinogenic. That means that there possibly is some risk of carcinogenicity, so additional research into the long-term, heavy use of mobile phones needs to be conducted. The WHO (World Health Organisation) added that “to date, no adverse health effects have been established as being caused by mobile phone use.” Some national radiation advisory authorities have recommended measures to minimize exposure to their citizens as a precautionary approach.
From the link below you can find a list of effects.
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. 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 exposure to fields between 100 kHz and 10 GHz (generally known as radio waves). It is commonly used to measure power absorbed from mobile phones.
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. For example in the USA and in the EU the maximum SAR levels are:
USA: the Federal Communications Commission (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.
EU: European Committee for Electrotechnical Standardization (Cenelec) specify SAR limits within the EU, following International Electrotechnical Commission (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.
Non-ionising radiation refers to any type of electromagnetic radiation that does not carry enough energy per quantum to ionise atoms or molecules—that is, to completely remove an electron from an atom or molecule. Instead of producing charged ions when passing through matter, the electromagnetic radiation has sufficient energy only for excitation, the movement of an electron to a higher energy state.
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