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Know specific absorption rate ( SAR ) and it’s effect..

SAR

Today, people are never far from their smartphones, whether it’s in their hand during their commute, lying in their pocket at work, pressed to their ear to make a call or resting on their bedside table at night. Questions have been raised about whether our close proximity to smartphones might be damaging our health. While there is no conclusive scientific research yet on the impact of cellphone radiation, people who want to weigh up the possible risks should take a glance at the following infographic.

What is the SAR Rating for Mobile Phones?

The SAR rating was first revealed in 1996 when the Federal Communication Commission released specific guidelines on human exposure to cell phone radiation.

They created SAR as a mean of measuring how much RF your body can take when making a call. The outcome of these proceedings was that a person cannot absorb more than 1.6 watts of energy per kilogram of body weight.

This upper limit of specific absorption rate is set well below the level of radiation that would endanger a user’s health. It is the result of intense laboratory testing and it has become a standard for all smartphone manufacturers.

The highest SAR was also set relative to the heat produced by RF radiation, and it has nothing to do with its possible side effects for your health, such as cancer or brain damage.

In other words, the SAR specification on a phone can only tell you the highest measurement taken for each frequency reached by the device, and not how much radiation you absorb.

What is a Safe SAR?

Undoubtedly, the safest cell phone that you can use is the one with the lowest SAR. All manufacturers of mobile devices are required by the FCC to meet RF standards and mention the specific absorption rate to consumers.

Most experts consider a safe SAR to be anywhere between 0.10 and 0.50.

In fact, several manufacturers like Samsung and LG try to stay within these limits for every model they release.

At the other end, companies like Huawei, Nokia, and Xiaomi consider the maximum SAR limit of 1.6 as a starting benchmark for their standards, and one from which they rarely stray away.

If you are in the market for a new smartphone from one of the top leading brands like Apple or Samsung, you might want to check the SAR ratings before you purchase one.

Which Smartphones of 2019 have the Lowest SAR?

Keep in mind that when buying a new smartphone, the SAR level is just one of the many features that you need to check, but not one that should be a deal breaker.

However, if you are looking for the lowest possible specific absorption rate, you have plenty to choose from and many reputable brands as well.

Here is a list of smartphones with the lowest levels of emitted radiation:

Manufacturer Model name SAR Value
LG G7 thinQ 0.244
Samsung Galaxy S9 0.29
LG V40 thinQ 0.318
Samsung Note 9 0.38
Motorola Moto g6 plus 0.44

These figures refer to the number of watts absorbed per kilogram of body weight when you make a call with the phone placed on the ear.

Which Smartphones of 2019 Emit the Most Radiation?

If you don’t consider SAR levels as a crucial criterion when buying a new smartphone, you probably won’t mind choosing a model with a high level of emitted radiation.

In this regard, the cell phone market will not disappoint you and present you with an appetizing offer that includes major, expensive brands as well as low-cost, competitive labels.

Here are the smartphones with the highest specific absorption rate levels available in 2019:

Make Model SAR Value
Nokia 8.1 0.711
Redmi Note 7 Pro 0.964
Honor View 20 1.03
Vivo Vivo Nex 1.06
iPhone XR 1.1
iPhone XS/XS Max 1.17
Vivo V15 Pro 1.258
Oppo F9 Pro 1.312
Oppo F9 Pro 1.312
Razer Phone 2 1.493
One plus 6t 1.552

As you might have noticed, these phones emitting the most radiation have SAR values over the 0.5 which are above the levels recommended by experts. A lot of these models are dual SIM devices which are mostly manufactured for the Asian market.

How to Absorb Less Radiation from Your Phone

The FCC is working closely with the Food and Drug Administration (FDA), the Environmental Protection Agency (EPA), the National Institute for Occupational Safety and Health (NIOSH), and the Occupational Safety and Health Administration (OSHA) to create better guidelines for smartphone use and radiation effects.

The FCC considers that you lower the risk of absorbing a high level of radiation when you:

  • Keep a phone conversation under 30 minutes
  • Keep the phone farther away from your head
  • Use a hands-free device
  • Opt for video communication instead of audio conversations
  • Choose text messaging over direct talking or audio messages

If you follow these simple guidelines and you use a low SAR smartphone, you expose your body to a significantly reduced level of radiation.

Additionally, opting for a single SIM device instead of a dual SIM cellphone may decrease the level of FR absorbed by your body.

How to Find Out the SAR Level of Your Phone

If you want to know how much radiation is emitted by your phone, but you cannot find your model in the statistics that we have presented so far, you can check the FCC SAR Database for better results.

Here are a few simple instructions on how to do that:

  • Dial *#07# to bring up the device information.

Final Thoughts

The SAR ratings show the level of radiation that your body may absorb during regular use of your smartphone.

The FCC does not consider them as potentially dangerous risks for your well-being, regardless of how much you use your cell phone.

The past few years have seen the manufacturers release cell phones with relatively low specific absorption rates.

As a result, the mobile phone market of 2019 offers a wide variety of devices that have a low SAR level and feature well below FCC benchmarks.

 

  • : Original article written at emfadvice.com
Posted in Electronics Engineering

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