When choosing a mobile phone, we pay attention to the range of different technical characteristics, but, for some reason, no one looks at such a value as SAR. Moreover, almost no one knows what it is.

For mobile phones, SAR is a measure of the electromagnetic radiation that a person is exposed to. Literally, the abbreviation SAR stands for: Specific Absorption Rates. SAR is measured in W / kg (watts per kilogram) and is used to measure the exposure of a person to electromagnetic radiation from a mobile phone. In Europe, the accepted value is 2 W / kg for 10 grams of human tissue (no more). The lower this indicator, the better.

Recently, not long after the release of the new iPhone 6 and iPhone 6 Plus, a statement was heatedly discussed on the Internet, which Eldar Murtazin, an analyst at Mobile Research Group, expressed on Twitter. He writes about the new iPhone 6: "It emits three times more than analogs, and even more unknown Chinese." More: "Using new iPhones without a headset can be trivial and unsafe."

And here is the SAR value of the iPhone 6 phones: 0.99 W / kg at the head, 0.91 W / kg at the body. Eldar Murtazin explains this simply: the bend of the radio module is at the limit in order to break through the aluminum case of the phone.

Of course, this does not prove that using this phone is dangerous for you, but nevertheless, for such a well-known and beloved brand, ah, it’s not good. I would not recommend such a phone to a child.

The situation is noticeably better for Samsung. After a short search for phones with the lowest SAR levels, it turned out that Samsung Galaxy phones dominate the majority of this list. The table of phone by different brands is shown below. There are not all phones here, but only those that I managed to find, and those that are on sale as of 2014.

Telephone	SAR (W / kg)
	0.12
Samsung C105 Galaxy S4 Zoom 4G	0.15
Samsung I9200 Galaxy Mega 6.3	0.2
Samsung I9060 Galaxy Grand Neo	0.21
	0.21
Samsung G750F Galaxy Mega 2	0.21
Samsung I9300 Galaxy S3	0.23
LG D858 G3 Dual	0.23
Lenovo A690	0.25
Alcatel One Touch Idol X 6040	0.27
Alcatel POP C9 7047D	0.27
Samsung i9000 Galaxy S	0.27
Samsung I9505 Galaxy S4	0.28
Samsung I8260 Galaxy Core	0.29
HTC Desire 500 Dual Sim	0.29
	0.29
Alcatel POP C7 7041D	0.29
Samsung N9005 Galaxy Note 3	0.29
Samsung i9250 Galaxy (Google Nexus)	0.3

How do I know the SAR level of my phone?

Sometimes this information is on the official website of the company, in the technical characteristics of the phone. Also often mentioned in the user manual. The online store can also indicate the SAR value on the product page (although this is rare). In any case, if there is a chewing to find out the SAR of any model of a mobile phone - Google or Yandex to help!

In standby mode, the phone almost does not emit electromagnetic waves, only sometimes, for fractions of a second, to communicate with the base station. So don't be afraid to carry your mobile in your pocket. But a continuous bend occurs when transferring data or talking.

And, finally, two simple tips for those who like to talk for hours on a mobile phone:

1. Do not hold the phone to your ear and do not hold it at one ear all the time (put it to the other ear every ten minutes).

2. Use a headset.

Disputes about the impact of cellular communications on human health are not abating. Research is constantly being carried out in the world, the purpose of which is to somehow clarify the situation and empirically prove whether there is a harmful effect on the human body.
Let's try to objectively look at the problem.

SAR

In order to somehow estimate the amount of radiation of a cellular device on the human body, the indicator "Specific absorption rate of electromagnetic energy" - SAR was invented.
SAR is a measure of the rate at which RF energy is absorbed by body tissues, measured in W / kg.
It is worth noting that the SAR values ​​indicated in the instructions for cell phones assume that the transmitter is operating at full power, for example, when you are in an area of ​​poor reception.

Scientists have carried out a number of studies that have not found evidence of a direct effect of mobile phone radiation on human tissue, leading to the destruction of DNA molecules or tissue ionization.
However, since the human body is 70% water, and water molecules are able to "absorb" radiation energy in the HF range and convert it into thermal energy, research has focused on this fact.

It has been experimentally proven that in the process of life, the temperature of the brain tissues can change up to 1 degree Celsius, without any consequences. Increasing by a large amount can affect health.

SAR has been calculated based on these values. In Europe, the level of 2 W / kg is recognized as safe for the head and 4 W / kg for other parts of the body. With this indicator, the temperature in the tissues increases by no more than 0.3 degrees Celsius, which does not harm the body. Nevertheless, already at 0.3 degrees, the destruction of protein chains was detected, but scientists do not associate this fact with the effect on health.
For the United States, the SAR is 1.6 W / kg.

For comparison, SAR values ​​are given that may cause adverse effects.

And how are we

In Russia, the standards for safe radiation are regulated by the resolution of the SaNPiN. Permissible radiation is measured in W / cm2 and is 10 μW / cm2. The SAR value cannot be transformed into Russian standards, it is done in a laboratory way.
Experts admit that in the Russian Federation there are even stricter requirements for radiation standards than in Europe and the USA.

STUK

In Finland, there is a CENTER for Radiation and Nuclear Safety (STUK), which, among other things, is engaged in research on radiation from mobile phones and their impact on humans.
Annually, the CENTER tests 15 arbitrary phone models for their compliance with the standards.

The essence of the research is as follows. The shape of the human body is filled with a substance similar in its parameters to human tissues. The telephone, at maximum radiation power, is positioned near the "head" of the form. The robot arm describes a certain trajectory, with a change in the position of the phone and at different frequencies. Radiation results are converted to SAR values ​​and saved. Measurements are taken separately for the head and separately for the rest of the body.

This is how it is looks like on the video.

Detailed research results for different phone brands can be found on the center's website.
Similar research centers also exist in other European countries and America.

As a conclusion

It should be noted that the temperature effect strongly depends on the position of the phone relative to the head, biological parameters of the body and age.
The ongoing studies on the possible interaction of mobile phone radiation and the growth of oncological diseases have not come to an unambiguous conclusion. Since the active use of cell phones has been going on for about 10 years and it will take much longer to reach a final conclusion.

In addition, it is not entirely correct to draw conclusions based solely on the thermal effect, because the impact of high-frequency radiation on the moral and psychological component and other components of health has not been fully investigated.

In any case, indirect harm to health has been scientifically proven. As a result of the experiments, it was revealed that the radiation of a cell phone initiates interference in the operation of pacemakers, which can lead to negative consequences.

As a recommendation, it should be recalled that the radiation power decreases in inverse proportion to the square of the distance, that is, if the distance increases by 2 times, the radiation will decrease by 4 times. Centers researching issues recommend, without the need not to keep the phone close to the body and, if possible, use wired headsets.
To use such recommendations or not, everyone decides for himself.

PS: Interesting results in the study of the problem can be found

Not many people know what SAR levels are in mobile devices. Today we decided to discuss this issue. The SAR level is a special indicator that is able to characterize the largest amount of electromagnetic radiation for various models and brands of mobile phones.

Dispute

If you have previously come across information about how a mobile phone can affect the human body, then this article will be able to supplement your knowledge, but those people who have never seen the relevant data at all will be able to learn a lot of new things for themselves. For example, the SAR level of a Philips may differ significantly from that of other mobile phones. It will be interesting to know how the communicator is able to influence the human body. Of course, at the present time there is a large number of the most diverse disputes on this matter. Some experts are looking for all the clues in order to prove that the radiation of devices can cause great harm to people. On the other hand, scientists are convinced that the dangerous indicator in mobile devices cannot exceed certain standards, and, accordingly, communicators are completely harmless. Surely now many of you are wondering how the SAR level can affect the body, as well as how to determine the mobile device that produces the most radiation.

Unit

In fact, there is no definite answer, or rather, no one knows exactly how these waves are able to influence the human body. The SAR level of mobile phones is a specific part of the absorption rate of electromagnetic radiation by the human body.

This data can be measured in watts per kilogram.

Allowable norms

You probably know that almost all mobile phones that are currently sold in showrooms undergo special certification, and this procedure can be completed successfully only if the SAR level does not exceed the established standards. There are special regulatory bodies that check and measure these parameters, in most countries the SAR is 1.6 watts per kilogram. This refers to the unit of mass of a person. For example, the SAR level of Nokia is listed separately for each model. The same can be said for a large number of other popular mobile device manufacturers. The value is characterized directly by the electromagnetic radiation of the device itself at maximum power. Judging by practice, then we can confidently note that the level of this indicator is much lower than the critical one, but the increase in these parameters may depend on various kinds of factors, such as the presence of a signal.

How to reduce the negative influence of the communicator

Surely many people want to know about the basic rules that can reduce the effect of radiation from a mobile device on the human body. Now we will give you some of these rules, and if you wish, you can use them. The SAR level is in fact capable of negatively affecting the human body, but with the help of special rules you can move away from such radiation, of course, this cannot be done 100%.

The first rule is that you should carry your mobile device as far away from your body as possible, especially when it comes to vital organs such as the heart. During telephone conversations, it is recommended to use a special headset more often or simply turn on the speakerphone, while keeping the communicator itself as far away as possible. If you are in an area where the signal is poorly received by a mobile device, it is reasonable to refuse lengthy conversations, since in such cases the radiation may even increase several times. It is recommended to bring the mobile phone to your ear only after the connection with the called subscriber is complete, since when dialing the phone starts working at the maximum power level.

Closed space

What is the SAR level?

Among the characteristics of the phone, you can often see the category "SAR level". Many do not know what this means, although for others this parameter means a lot.

A mobile phone during operation inevitably creates a weak electromagnetic field around itself - it receives and sends a radio signal at a certain frequency. The electromagnetic field affects the human body, but this effect has not yet been fully studied - that is why there are many rumors and speculations associated with it.

The most obvious influence is the energy that is released in human tissues under the influence of electromagnetic radiation. That is, they heat up slightly. In particular, a similar principle is used in a microwave oven, but one should not confuse a microwave oven and a mobile phone. They are designed differently, operate at different frequencies, and serve different purposes. The power of any oven is hundreds of times greater than the power of any mobile phone, finally.

What is the SAR level? In strict terms, this is the amount of energy released by human tissues at the maximum signal level and, accordingly, radiation from a mobile phone in one second. This level is specially measured in the laboratories of major mobile phone manufacturers so that the devices are approved for sale. There are websites where you can check the SAR level of any mobile phone. Many manufacturers put it in their technical documentation. The SAR limits in Europe and the United States are very low, and the radiation is safe even for a child. This permissible value has been deliberately set with this in mind.

Much more concern can be caused by different unexplored aspects of electromagnetic radiation, which, perhaps, acts detrimentally over time, that is, it is a hidden source of some diseases and ailments that will manifest themselves only over time. Unfortunately, research on this topic so far did not give reliable results... That is, there is a danger, as it were, but no one has yet been able to "catch" it, to understand its nature. In this case, there is a simple logic - if the impact on the body is constant and intense enough, then it will have some consequences.

So, we can conclude: the electromagnetic field of a branded mobile phone is not dangerous to the human body with moderate use of the device.

If you have to so many talk on a cell phone ( 2-3 or more hours a day), then the negative impact can be minimized by following these tips:

• Get a device with a low SAR level (Philips X501, Samsung GT-I8000, Nokia 6600i Slide, Samsung GT-S3100, Sony Ericsson W760i, LG GW620, Alcatel One Touch 806);
• The highest level of radiation is recorded at the moment of establishing a connection, therefore, after dialing the number, do not rush to put the phone to your ear, wait a few seconds;
• Buy a wired or Bluetooth headset;
• Being in the zone of uncertain or relatively weak reception (less than half of the scale on the phone), you should reduce the duration of calls to a minimum, if possible, replace voice communication with SMS;
• If you have to make frequent calls from your car, install an external car antenna. The metal body of a car significantly worsens the conditions for signal transmission from the phone to the base station, so the power increases.

Cell phones, in addition to the amount of memory, processor speed and megapixels in the camera, have another important indicator - the level of radiation. Usually the SAR value is given in the characteristics - this is “the radiation level determines the energy of the electromagnetic field released in the tissues of the human body in one second” (quote from “Wikipedia”).

For example, the MagCom phone (MagCom model) has a SAR level of 0.04, while the iPhone 3GS has a SAR level of 1.20 (this is the maximum). The norm is 2. By the way, marketers, here's an idea for you. "Eco-friendly" phone, green and made of wood. With minimal radiation. "Defend Against Cancer" and all that.

The radiation of the phone depends on what frequency it operates on (only GSM has several frequency ranges, and there is also WCDMA, and so on), how high the signal level from the station is and whether WiFi and Bluetooth are turned on (all transmitters emit) and other radio modules.

In addition, SAR is measured differently in different countries. In the United States and some other countries, the SAR value is measured per 1 gram of tissue (and often this characteristic is referred to as US SAR), the norm in these countries is 1.6 W / kg, in Europe and parts of other countries - per 10 grams, the norm, in In this case, 2 W / kg (EU SAR). Russia has adopted its own SanPiN standards. The SAR value in them cannot be translated by simple mathematics, but it is known that Russian standards are, in general, more stringent.

Now, watch your hands. But what if the phone has two or three telephone radio modules? It is logical that their radiation level will be higher. How much? Do SAR values ​​add up? I don't know the answer to the last question, but you can see SAR for mobile phones with multiple SIM cards.

I looked at a few examples. Certified Samsung Duos SGH-D880 - 0.22 W / kg (per 10 g), Samsung Duos GT-C5212 - 0.62, and Fly does not disclose information about SAR of its phones anywhere (sic!), But they are sold officially in Russia. Apparently, the level is the maximum permissible or very close to the upper limit.

For the "gray" Chinese, the characteristics are more difficult to find, but the network mentions that, allegedly, someone from Mobile-Review made measurements (they did not find anything on their website) and the results were as follows: TV1000 - 1.63, N95 - 2, 08, F003 - 3.12, C5000 - 2.63. If this is true, then what scale was measured does not matter, it is still a lot.

Based on the numbers found, there are three conclusions. First, everything is strict with certification in our country, otherwise the counters official stores would be inundated with Chinese phones (it is clear that you can buy anything on the markets), the second one - from certified phones with two SAR SIM cards within the normal range, but there are two emitters, hence the conclusion that the reception will be weak, which is often the case with users of such phones ( sometimes, however, it happens that one radio module is weaker than the second, which is also unpleasant). To conclude - it is better not to buy phones with three radio modules at all.

The third conclusion is that manufacturers of phones with two SIM cards have to somehow reduce the level of consumption. I do not know of a single certified cell phone with two SIM cards, where, when calling with one SIM card, they could call the other one. But full of such Chinese. This is probably due to the fact that the second radio module "falls asleep" in order to reduce radiation during a conversation on the first one.

P.S. For a snack - there is a cell phone with 4 SIM, produced, of course, China.