Safe sar. SAR level of phones and smartphones: what do you need to know? SAR - how it affects our health

There is a theory that mobile phones affect the human body. Scientists around the world have already long time cannot come to the same opinion about the dangers of radiation. The controversy continues to this day. The best minds of humanity were divided into two groups. One theory is that electromagnetic radiation causes great harm to health. But representatives of the second group still believe that if it does not exceed the established norm, then it is completely safe. Which of these theories is correct? to an ordinary person It’s not just difficult to understand, it’s impossible, so everyone must make a decision on their own. But despite this, manufacturers mobile devices still indicate the SAR level. We'll tell you what it is a little later. More often this indicator indicated for each phone model. Almost everyone does it large manufacturers gadgets. SAR standard corresponding modern requirements, was adopted in 2001. Thanks to it, you can choose a radiation-safe phone. However, you need to understand that this term was developed on the initiative of the manufacturers themselves. This is what helped get rid of rumors about the great harm of devices and their negative impact on the human body. Having legitimized certain standards, company developers began to comply with the requirements established by the government of a particular country. And this, in turn, helped get rid of all complaints from consumers. Check the information provided by the manufacturer to the common man difficult, so whether to trust her or not - everyone can decide individually.

So, let's figure out what it is - the SAR level, what radiation standards are considered safe, and also get acquainted with some recommendations to reduce its impact on the human body.

Concept

SAR is an abbreviation derived from the phrase Specific Absorption Rate. WITH English language it literally translates as “specific absorption coefficient”. While your phone, smartphone, or other mobile gadget electromagnetic radiation occurs that affects humans. To be more precise, the body absorbs it. The world has adopted a single unit of measurement, SAR. It is written as W/kg and stands for “watts per kilogram”.

Based on the above information, we can give a definition that will help the common person understand what it is - the SAR level. To be brief, this is an indicator of the magnitude electromagnetic radiation, which is generated by any mobile device.

Norms

Manufacturers mobile phones Before releasing products to the market, they must obtain a certificate. It is issued only if the SAR level does not exceed the established norm. It may vary depending on the country. For example, in Europe, the amount of radiation per 10 g of body tissue should not exceed 2 W/kg. Calculation in Canada, the USA and several other countries works a little differently. SAR level they are calculated per 1 g of tissue, and permissible norm is 1.6 W/kg. But in Russia they use a completely different measurement system - watts per body area. According to SanPiN standards, a dose of 100 μW/cm² is considered safe. But in practice it is quite difficult to find mobile phones whose SAR will correspond to this indicator.

What devices are safe? To determine them, you need to know that small radiation indicators include those that do not exceed 0.5 W/kg. Devices with SAR up to 0.8 W/kg fall into the medium category. Other phones with high radiation (from 1.2 W/kg) can already pose a health hazard, so it is advisable to reduce interaction with them to a minimum. People who have an old mobile phone in use should pay special attention to this criterion. Before 2001, the permissible radiation limit was much higher. For example, in the UK a certificate was issued for devices with an SAR of 10 W/kg. And now you can buy a phone that emits 5 W/kg during operation. Most often, such models are produced by unknown manufacturers from the Middle Kingdom.

Low SAR phones

Currently, most manufacturers are trying to fully comply with the requirements. Moreover we're talking about not only about world leaders, but also about little-known companies. Below is a table indicating phone models that can be considered safe for human health. The rating is based on the SAR value.

Phones with high SAR levels

If anyone thought that only an old mobile phone could pose a health hazard, then they were very mistaken. Even nowadays there are gadgets on sale that have quite high level SAR. It is impossible to say unequivocally that they can cause harm, but every user should have this information. Below is a table with certain models phones whose radiation value exceeds 1 W/kg.

In principle, we have dealt with the question “what is the SAR level”. Probably some phone owners will find it useful the following recommendations. By adhering to these rules, you can significantly reduce the absorbed human body radiation dose.

• It is advisable to wear or store the device away from the body.
• Use a headset for long conversations with the subscriber or turn on speakerphone.
• At weak signal Networks reduce call duration.
• Try, if possible, not to cover the part of the phone case where the antennas are located.

IN lately when discussing mobile phones, smartphones and other wireless devices The term “SAR level” is increasingly appearing. For example, this term can be found in technical specifications devices or in articles reviewing these gadgets. At the same time, it is not always explained what the SAR level is, what it affects and what it should be.

The abbreviation SAR stands for Specific Absorption Rate, which can be translated into Russian as specific absorption rate. The SAR level is an indicator that indicates the energy level electromagnetic field, which is absorbed by the human body in one second. This indicator is used to determine the magnitude of the dangerous influence of the electromagnetic field emitted by a smartphone or phones during its operation.

Typically, SAR levels are measured in watts per kilogram. For example, in the European Union the permissible SAR level is 2 W/kg per 10 grams of body. In the USA, the permissible SAR level is even lower - 1.6 W/kg for 1 gram of body. It should be noted here that while determining the SAR level, the smartphone or telephone operates at its maximum power. Whereas in real conditions, the radiation level is usually much lower and depends on the quality of communication at the point where the user of the device is located. If the user is close to base station mobile operator, then the radiation level can be 100 times lower than the maximum possible. On the other hand, some scientists note that the permitted SAR levels are significantly higher than the levels needed to cause .

What is the SAR level of modern smartphones?

Old mobile phones that worked on the base cellular standard NMT (Nordic Mobile Telephony) could emit so much powerful signal that their SAR level reached 5 W/kg. Fortunately, modern devices this indicator is within more acceptable limits.

For example, we give 20 modern smartphones with the highest SAR level

Now for comparison 20 modern smartphones with the lowest SAR levels(values ​​for the user's head).

And one more example - SAR levels for everyone iPhone models (values ​​for the user's head).

As you can see, in modern smartphones the SAR level fluctuates around 1 W/kg. At the same time, the question may arise why models from some manufacturers have such low level SAR. In particular, there are many models from Samsung in the ranking of the safest smartphones.

The main reason for this result is the antenna design. If the antenna is located at the bottom of the phone, then it will irradiate less of the user’s head and more of his body, and if the antenna is located at the top of the phone, then the head will receive more radiation. For many Samsung models the antenna is at the bottom, so their head SAR value is significantly lower.

How to find out the SAR level for your phone

If you're interested in the SAR level of your phone, it's easy to find out. All you need to do is enter your phone model name into any search engine and find the specifications page.

If a simple search in search engine does not give results, then you can contact the site. Go to this site and use the site search to find the model you need.

On the specifications page, go to the “SAR” tab.

Then scroll down the page a little.

Here you will see your smartphone model and its SAR level.

How to reduce the impact of high SAR levels

If you are unlucky and it turns out that your smartphone has a fairly high SAR level, then you can take a number of steps: simple measures, in order to reduce harmful influence on your body.

• Hold the phone by the bottom of the case. This way you won't obscure its antenna and the phone won't increase its transmit power.

• When talking indoors, try to approach the window. This will improve call quality and reduce the transmission power your phone uses.
• Don't get carried away with conversations if you are far from the mobile operator's base station. Because the further away you are, the higher the transmission power.
• Do not get carried away by conversations in a car or other transport. Metal body vehicle degrades the quality of communication, which leads to an increase in transmission power.
• Do not use covers or cases, as they also reduce the quality of communication.
• If possible, use a headset or speakerphone to avoid holding the phone next to your ear.
• When dialing a number, place the phone to your ear only after a successful connection.

Scientists around the world are busy searching for the dangers posed by mobile phones.

This is due to the fact that the number of users cellular communication is growing, and operator equipment is being placed in public places. Among experts, opinions are divided: some believe that technology and progress are good, others believe that the more gadgets there are, the better for people’s health and the environment.

Radiations in life

Scientists see a particular problem in the fact that, unlike other electrical appliances, the telephone is located in close proximity to a person’s head, so the impact of gadgets is considered to be more negative than, for example, radiation from a microwave oven. According to experts, Bluetooth headsets do not save the situation, since wireless interface also carries a certain amount of radiation.

In addition to smartphones, devices that are potentially hazardous to human health include: microwave ovens, radios, modems, routers and much more. All of these devices emit radio waves to a greater or lesser extent, but scientists see less danger in these items due to their distance from the user during operation.

What is the SAR level?

Due to the principle of its operation, the phone certainly emits non-ionizing radiation. To classify the danger level of radiation, the SAR system was introduced. It shows the level of impact on the human body per second of use of the gadget. The value is measured in watts per kilogram.

All phones that are officially available for purchase in Russia must comply valid value SAR - up to 1.6 W. This value is 2.5 times lower than the one that made changes to the DNA of animals during experiments.

Smartphones do not emit radiation as such, but non-ionizing radiation is still observed. It does not change the DNA structure and does not harm the user’s body. The effect of non-ionizing radiation can be observed in the form of heating of the ear after a long conversation.

Precautions

For those who seek to minimize the impact of gadgets on the body, experts advise using mobile phones on the street, connecting a headset if possible, and reducing talk time to 1-2 minutes. It is also recommended to limit the daily use of mobile phones by children and people with weak immune systems. It is better to leave the device charging away from the bed, and in everyday life Carry your smartphone in your bag, not in your pocket.

Cell phones, in addition to the amount of memory, processor speed and megapixels in the camera, have another important indicator - the level of radiation. Typically, the characteristics give the SAR value - this “the level of radiation 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, and the iPhone 3GS has a SAR level of 1.20 (this is at 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 levels. “Protect yourself from cancer” and all that.

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

In addition, SAR is measured differently in different countries. In the USA and some other countries, the SAR value is measured per 1 gram of tissue (and this characteristic is often 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 using simple mathematics, but it is known that Russian standards are, in general, more stringent.

Now, watch your hands. What happens if the phone has two or three telephone radio modules? It is logical that their radiation level will be higher. How long? Do SAR values ​​add up? I don’t know the answer to the last question, but you can look at the 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 never discloses information about the SAR of its phones (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 it is mentioned on the Internet that supposedly someone from Mobile-Review took measurements (I couldn’t 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 it doesn’t matter on what scale it was measured, it’s 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 shops would be overwhelmed Chinese phones(it’s clear that you can buy anything in the markets), the second one is from certified phones with two SIM cards, SAR is within normal limits, but there are two emitters, hence the conclusion - the reception will be weak, which is what users of such phones often complain about (sometimes, however, it happens that one radio module weaker than the second, which is also unpleasant). The bottom line is that it’s 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 don’t know of a single certified cell phone with two SIM cards, where when calling with one SIM card, they could call the second one. But there are plenty of Chinese ones like that. 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.

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

We are talking about a coefficient that worries many users.

SAR (Specific Absorption Rate) is an indicator that characterizes the degree negative impact phone or smartphone per user. In other words, this is the specific absorption coefficient of electromagnetic radiation by the human body. The unit of SAR is watts per kilogram (W/kg).

The indicator was introduced in 2001 and was developed by gadget manufacturers. The purpose of creating SARs is to demonstrate that phones are harmless to their users.

SAR values ​​in different countries

Depending on the state requirements for the safety of gadgets, the SAR value in different countries may differ. For example, for the USA the permissible level of radiation is up to 1.6 W/kg, Europe considers values ​​up to 2 acceptable, and in Russia a standard has been adopted that does not exceed 1.6. It is important that the peak SAR value is regulated at the legislative level.

Devices rarely operate at maximum power, which means that the actual figure may be 10 times less than declared. In order for the phone to operate at the maximum values ​​of the declared SAR, a minimum level of the mobile operator's network is required. If the smartphone shows less than half the network level, the radiation level increases. In other cases, SAR is within the normal range for humans.

SAR level in different periods

The minimum SAR is 0.1 W/kg, but such figures are modern gadgets difficult to meet. Maximum value is about 10 W/kg, which is also very rare.

Manufacturers today strive to minimize the impact of their products on users, so they are working to reduce SAR indicator. The greatest influence on this parameter is the degree of distance from the ear to the smartphone antenna. Thanks to massive cases, this is not so difficult to implement, but this method also has disadvantages - a decrease in the SAR coefficient leads to a deterioration in communication quality.

The second way to influence this value is through screening. Due to metal elements, harmful effects electromagnetic waves takes over the device body or special equipment inside the phone. This option does not affect the network signal level and can significantly reduce SAR.