What is the SAR value?
The Specific Absorption Rate (SAR) is a number that measures the rate at which energy is absorbed by the human body when exposed to radio waves.
In mobile telephony, we use the specific absorption rate to measure the energy absorbed my a particular mass of human tissue, within a certain amount of time. We measure SAR in units of power per mass (W/kg).
In other words, SAR is nothing but a simple way to measure a cell phone's radiation broadcasting capabilities. This helps us to make sure that a device doesn't exceed the maximum limits set for our safety.
How do we calculate the SAR value?
To make an SAR measurement, we must set a quantity of mass. Measurements are usually performed either on the whole body or tissue samples.
When measuring the SAR value, cell phones are placed against a representation of a human in a talking position.
To determine the SAR value, a smartphone is tested under the worst case scenario, so as to emit the highest radiation levels possible.
At the same time, measurements are taken at various distances between the phone and the head, to simulate the way each user holds their phones.
The largest of these measurements defines the SAR value of the tested device.
As we mentioned above, mobile manufacturers conduct SAR measurements under the worst case scenarios. Thus, the SAR value that we can usually find printed on the manual is the highest possible value of that particular device.
In the United States, phones should have an SAR value below or at 1.6 W/Kg, taken over the volume containing a mass of 1 gram of tissue. In Europe, the limit is at 2 W/kg, but in a sample of 10 grams of tissue.
That doesn't mean that in Europe they have a higher allowed limit than in the US. We can not compare the two values because they refer to different amounts of tissue.
For example, if we have a device with 1.2 SAR value by European standards and a different phone with 0.9 in US standards, we can not conclude that the first one emits more radiation than the latter.
We should always make comparisons between SAR values measured on the same amount of tissue.
Is a high SAR value dangerous?
That is a question we hear a lot. Is cell phone radiation dangerous? If so, does the SAR value help us to choose a safer device?
There are so many scientists working on this, and there has been a lot of research, but nobody can definitively claim that radiation causes health problems. Neither the opposite though. And that's where things get complicated.
According to a recent study, experiments with radio waves conducted in mice resulted in cancerous tumors.
However, there is some fine print that we should take under consideration.
First of all, mice are not humans. You obviously knew that already. Their tissue may react differently to radio waves than human tissue.
Also, the amount of radiation used was seven times higher than the amount of radiation a person is exposed to, with an average daily usage of a cell phone.
In other words, you would have to talk on your phone 10 hours daily for months, to be exposed to such an amount of radiation.
We know for sure that radio waves are considered safe for humans. Although radars operate on the same spectrum, we are not going to stand in front of a radar antenna, are we?
Therefore, the wavelength itself is not the only thing that we should take under consideration. Signal strength and exposure time play a significant role if we want to determine what is safe and what's not.
Scientists and research always lead to the same conclusion: It is possible that constant exposure to radiation from cell phones may cause health issues, but we are not in a position to know it or to prove otherwise, as of yet.
In conclusion, nobody can make a clear statement on whether long-term cell phone usage is safe or not.
For our part, we can only follow the simple rules mentioned below to minimize exposure. Better safe than sorry, but always without exaggerating and panicking.
Beware of the scams
As it happens with any similar situation, many try to make a profit out of other people's fear and despair.
Cell phones are no exception, and we have seen in the market several devices, "special" hats, and magic helmets, that promise to keep you safe from radiation.
We suggest that you deal with caution with products like that. Do your research, be skeptical, and smile.
How reliable is the SAR value?
The SAR value is used as a reference on whether a device is considered safe for sale or not. But it is not a reliable criterion for choosing between two devices.
Let's take for example smartphone A with an SAR value of 1.2 and smartphone B with 0.8.
Smartphone A may have scored higher on one of the measurements (e.g. with no signal and far away from a cell site), with the rest of the measurements being significantly low - around 0.6. Its SAR value is determined by the highest measurement; it is not the average of all measurements.
In the same way, smartphone B may have responded better in the worst case scenario with a 0.8, but all the other measurements were around that number too.
In this case, the user will receive higher amounts of radiation from device B under normal conditions, than with device A.
This example shows how the SAR value can be misleading, and shouldn't be a priority when picking your next smartphone.
What SAR doesn't show?
The radiation a cell phone emits increases sharply in places with a weak signal, as we explained above.
So, what good is to have a smartphone with 0.8 SAR, if it consistently operates at the higher levels, due to lack of signal?
A different device with higher SAR may have a better antenna and therefore better signal in everyday use. With a better signal, it may emit less radiation than the first.
The same applies to the distance between the phone and the body. Each user holds his mobile differently, others use headsets, etc. Even the smallest change in holding angle and grip may change both the radiation emited and the percentage of radiation absorbed.
SAR values don't provide any such information. We can't possibly tell how much radiation our body absorbs, just by checking the SAR value.
What is SAR Value of POCO F1?
Sar Value of Poco F1 is 0.746, We Can Even Check By Dialing "*#07#", So Even If Raditions are Bad, POCO Users are More Than Safe Than Regular Sar Value
Keep Enjoying With Your POCO