Sar head and body. SAR in the phone - what is it, what is the acceptable level for a person & nbsp. Phones with high SAR levels

Dangerous influence of technology

Very often I began to notice that on the forums, users pay special attention to the SAR indicator. The abbreviation has the following decoding - Specific Absorption Rate, used in the description of the technical features of a particular model. But on the product pages of online stores there is no detailed explanation - what this value is for, what effect it has on the cost, functionality, and operational properties of the device.

"CAP" is a coefficient indicating the level of absorption electromagnetic radiation coming from the smartphone. This is an important criterion, since it determines how much energy is transmitted in one second during the operation of a mobile device. Watts per kilogram are used as units of measurement, but each country has its own standards. For example, in the EU, 2W is allowed per 10g of a human body. In the United States of America = 1.6 watts per gram. It should be understood that the calculation takes into account the situation when the device works at its maximum capacity, emitting the maximum amount of energy. In domestic conditions, it is possible to achieve a similar effect, but usually the effect is several times weaker than the established limits.

You probably know that the most active electromagnetic surge is observed during a call. A SAR level on the same smartphone may vary depending on the distance to base station(towers) mobile operator... The closer it is, the less radiation. Scientists have conducted a number of studies on this matter and posted the results for everyone to see. What is the biological effect that occurs when different meanings coefficient? if less than 1 W per kg, there is no danger;

2 W / kg - the tissues of the human body at the point of contact are slightly heated (maximum by half a degree);

8 W - a negative effect leads to an increase in body temperature (37 degrees and above);

over 50 W - there is a high probability of getting burned. The permissible SAR level of modern phones

It should be noted that in the early 2000s, the number of push-button telephones was small, but existing models emitted about 5 watts per kilogram. It is good that the tariffs were expensive and only the “major” user could afford to talk for a long time.

If you are interested in Apple technology, then here is a visual comparison: Obviously, starting with the iPhone 8, the developers have made some changes in the design, which affected the reduction of the coefficient. Useful content: What is an accelerometer for?

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After reading the above material, there is an irresistible desire to receive information on your phone. We hasten to reassure you - if you do not have an old push-button Siemens or Ericsson, then there is nothing to worry about. New models are unlikely to set fire to the skin, unless the battery explodes (unfortunately, such cases have been recorded).

Finding out SAR is very simple - just visit any site that provides a detailed description of the characteristics of the gadget. These resources include: Yandex Market. Enter the name into the search bar, see a list of offers, select the desired device. Go to the "Characteristics" page and in the "General" section view the value of the indicator: DeviceSpecifications. There is a search form in the upper right corner. A list of brands is also available below it. The essence is simple - find desired device, then select the SAR tab: Scroll a little lower and see a diagram indicating the required information: It would be possible to compile a rating for modern devices, but I don't see the point. Everyone has their own preferences and tastes, we have shown a way to obtain information. The rest is up to you! The author recommends: Custom and stock firmware in the phone - what is it, what is the difference

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Have you seen which ATS is on your phone? Scared? Then read on to find out simple ways reducing the negative impact. During a call, hold the device with your hands so as not to block the antenna, otherwise the gadget will need to amplify the power to maintain communication with the base station;

If you are indoors, then try to go out onto the balcony, stay closer to the window;

The following advice is unlikely to be adopted by anyone. Do not use covers - they also reduce the passage mobile signal and lead to an increase in the power of electromagnetic radiation;

While waiting for the connection (after pressing the call button), keep the smartphone away from your head. Now you know more about the SAR level in the phone, what it is, how to find out the value for specific model and minimize the effect on the body.

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. 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 have become interested in 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 apparatus 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 speakerphone, while the communicator itself must be kept away from yourself as far 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

SAR (from the English Specific Absorption Rate), specific absorption rate electromagnetic energy Is an indicator that determines the energy of the electromagnetic field absorbed in the tissues of the human body in one second. These indicators, among other things, measure the magnitude of the harmful effects of mobile phones or smartphones on the human body. That's why this parameter can be found in the characteristics of mobile devices.

Interestingly, science has not fully figured out how the radiation of a mobile phone or smartphone affects our body, therefore, no one can provide accurate data. However, in Europe, it is believed that the specific absorption rate of electromagnetic energy should not exceed 2 W / kg for 10 grams of tissue - this is the intensity with which a smartphone or phone can emit radiation during a conversation when it is near a person's ear. In the USA, a different measurement system is used - no more than 1.6 W / kg for 1 gram of fabrics.

Another feature is that the SAR value is determined when the phone or smartphone is operating at full power. If we talk about ordinary life, then the transmitter power depends on the conditions in which the user is. So, if it is located in a place where the connection quality is excellent, the less power. However, there are other situations as well. In addition, the SAR level depends on other circumstances.

Should you pay attention to the SAR level when buying a new smartphone or phone? As it was written above, scientists have not fully figured out the effect of radiation from mobile gadgets on the human body. Nevertheless, it is recommended to take into account the SAR indicator - the lower it is, the better for human health.

You can check the SAR level in the specifications for the device. Take for example Samsung Galaxy A5 (2017) SM-A520F. Here are its characteristics on Yandex.Market:

As you can see, the SAR level is indicated here - 0.52. This is a very good indicator, although not a record one. In Samsung Galaxy S7 Edge, it is only 0.264, and with this indicator, the smartphone occupies a leading position at the end of 2016. By the way, here are the ten safest devices in terms of SAR at the end of 2016 (according to sammobile.com):

• Samsung Galaxy S7 Edge (0.264)

• Asus ZenFone 3 (0.278)

• Samsung Galaxy A5 2016 (0.290)

• Lenovo Moto Z (0.304)

• OnePlus 3 (0.394)

• Samsung Galaxy S7 (0.406)

• HTC 10 (0.417)

• Sony Xperia XA (0.473)

• Honor 5X (0.560)

• Samsung Galaxy A3 2016 (0.621)

01/02/2019, Wed, 15:07, Moscow time , Text: Vladimir Bakhur

2018 SAR rating leaders and outsiders

Despite the fact that the so-called "SAR-radiation" (Specific absorption rate, specific absorption rate of electromagnetic radiation by human tissues) of modern smartphones is very far from the levels strictly regulated by national regulators, models with a spread of this parameter appear on the market every year.

The degree of absorption of electromagnetic radiation by the human body may depend on many factors, such as the radiation power of the smartphone (maximum and average), the distance and location of the device relative to the user's head or body, the dimensions and shape of the smartphone and antenna, measured frequencies, etc.

In this regard, the SAR level is estimated in several ways, for example, for the head, body, in the mode of simultaneous transmission in different frequency ranges(simultaneous radiation, broadband radiation), etc.

SAR radiation of modern smartphones differs at times

This is what the various SAR levels of a number of modern smartphones look like according to the official database of the US Federal Communications Agency (in alphabetical order of brands).

SAR levels of popular smartphones in 2018

Source: FCC

If we evaluate SAR radiation only by the effect on the head, the undisputed leader in the rating with the minimum exposure to the user is the LG G7 smartphone. Followed by a group Samsung smartphones Note 9, S9, and S9 + (and squeezed in between the vivo NEX).

The maximum SAR-radiation "on the head" from the group in question is provided by smartphones from the Google Pixel 3, OnePlus 6 family and, oddly enough, LG V40, which "excelled" in all respects. Apple iPhone smartphones are in a “dense group” with results generally above average: it is certainly far from the critical level, but also not close to the minimum indicators.

In terms of maximum one-time radiation, many smartphones show a level of more than 1.5 W / kg and higher, including all new models of Apple iPhone, Google Pixel 3, Samsung Galaxy Note 9 / S9 and others. It seems that the FCC limits the maximum radiation of smartphones for this parameter.

What is SAR and how is it measured

The SAR standard and the methodology for its measurement, developed back in 1996, are often objects of criticism, but still remain one of the few numerical methods for assessing the potential impact of smartphone radiation on a person. However, for users who want to hedge against any obscure factors affecting their health, a higher or lower level of SAR radiation can be a decisive factor when choosing a smartphone.

The level of SAR radiation refers to the rate at which electromagnetic energy is absorbed by the tissues of the human body. In Europe and the USA, it is customary to measure the dimension of SAR in watts per kilogram (per second), in Russia, the radiated power is measured in watts per square meter. cm.

Science has yet to provide evidence linking the radiation unequivocally cell phone with health problems, and especially pointing to radiation as a decisive factor in any disease.

The SAR value of a smartphone is determined by its performance at maximum power, although in practical conditions the transmission power depends on many conditions. Typically than better quality communication at the point of location of the subscriber, the lower the radiation power, while the power level of the smartphone transmitter is controlled from the base station.

Scientists have not yet found a connection between the effects of smartphone radiation on human tissue with the destruction of DNA molecules or tissue ionization. The generally accepted point of view is that the human body, consisting of 70% water molecules, can convert the energy of HF radiation into thermal energy at the same time, a change in brain tissue temperature by more than 1 ° C is considered critical for health.

In Europe, according to IEC 62209-1, the permissible radiation value is 2 W / kg for 10 grams of head tissue and 4 W / kg for other parts of the body. Under such conditions, the temperature of the tissues rises by no more than 0.3 ° C, which is considered harmless to the body.

In the United States, the Federal Communications Agency (FCC) certifies mobile devices with a SAR level of not more than 1.6 W / kg for 1 gram of tissue.

In Russia, according to the resolution of the SaNPiN of June 09, 2003, the permissible radiation should not exceed 10 μW / sq. see. Despite the impossibility of direct conversion of SAR into the standards of our country, experts note that in Russia the requirements for radiation standards are more stringent than in Europe and the United States.

Scientists around the world are looking for the dangers of a mobile phone.

This is due to the fact that the number of users cellular communication is growing, and the equipment of the operators is located in public places. Opinions were divided among experts: some believe that technology and progress are good, others believe that the more gadgets there are, the better the health of people and the environment.

Radiation in life

Scientists see a special problem in the fact that, unlike other electrical appliances, it is the telephone that is in close proximity to the human head, therefore, the effect of gadgets is considered to be more negative than, for example, radiation from a microwave. According to experts, Bluetooth headsets do not save the day, since wireless interface also carries a certain amount of radiation.

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

What is the SAR level?

By virtue of the principle of its operation, the phone will certainly emit non-ionizing radiation. To classify the degree of radiation hazard, the SAR system has been introduced. It shows the level of impact on the human body per second of operation of the gadget. The value is measured in watts per kilogram.

All phones that are officially available for purchase in Russia must comply with the permissible SAR value - up to 1.6 watts. This value is 2.5 times lower than that which introduced changes in the DNA of animals during the experiments.

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

Precautionary measures

For those who seek to minimize the impact of gadgets on the body, experts advise to use mobile phones outdoors, connect a headset whenever possible and reduce the talk time to 1-2 minutes. It is also recommended to limit the daily use of mobile phones by children and people with weak immunity. It is better to leave the device on the charger away from the bed, and in Everyday life carry your smartphone in your bag and not in your pocket.