Home Health Exposure to waves: a marked reduction with the headset

Exposure to waves: a marked reduction with the headset


The development of radiofrequency technologies and associated applications has grown over the past twenty years, with the appearance of new functionalities for mobile communications, the rise of Bluetooth standards, Wi-Fi and even new generations of mobile telephony. If on the one hand these new products are acclaimed by the population, on the other hand they arouse mistrust because of the electromagnetic waves necessary for their operation. Thus, the SAR, or specific absorption rate, is the indicator used to assess the amount of energy absorbed by the body exposed to radio frequency electromagnetic waves. Its regulatory limit value in France is set at 2W/kg, whether the phone is placed in the head or trunk.

For users wishing to reduce as much as possible their exposure to the waves without giving up their frequent phone calls, a study by the National Frequency Agency (ANFR) relayed by the 20 Minutes site gives them an easy-to-follow tip. What is it ? Using a headset which makes it possible to reduce the level of exposure of the body, more particularly of the head, to electromagnetic fields. To come to this conclusion, AFNOR carried out exposure measurements of six headsets available on the market. Two categories were considered, the first being the wired kit (two copies) which propagates along their metal wire the electromagnetic field produced by the mobile phone.

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Wired kit or not: what to choose?

The second is none other than the wireless kit (four copies) which itself produces an electromagnetic field when it communicates in Bluetooth technology with the telephone to which it is paired. Technicians proceeded by conducting 920 specific absorption rate (SAR) measurements on all the kits of the panel. “There is naturally a greater amount of measurements on the wired kits, which are tested on all bands of 2G, 3G and 4G technologies since the exposure produced by the kit is a reflection of the different modes of operation of the phone. . Additionally, wired kits were measured with two phone models, to appreciate the variability of the coupling between the kit and the telephone depending on the model. “, specifies AFNOR.

On the other hand, the measurements of wireless kits only cover a single band, corresponding to the Bluetooth technology implemented: as their level of specific absorption rate remains independent of that of the telephone, a single series of tests has been carried out for each wireless kit. The results showed that using the headsets, exposure to SAR est on average 9 times lower in the head and 12 times lower in the limbs, compared to the values ​​obtained with devices without a hands-free kit. Experts also point out that the SAR of wireless kits is slightly higher than that of wired kits, because the latter depends on the power emitted by the telephone to which it is connected: a telephone at full power does not correspond to everyday use.

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On the strength of these results presented to the National Dialogue Committee on public exposure to the airwaves, the ANFR therefore considers that the use headset kits, whether wired or wireless, allows you to significantly reduce the level of exposure to waves compared to a telephone “glued” to your ear: the level of exposure of the head is reduced by a factor of 10 on average . And knowing that the measures concerned the Specific Absorption Rate with equipment that the experts put in a “worst case” situation (poor perceived signal), i.e. at maximum power throughout the duration of the experiment. However, “this is rarely the situation encountered during conventional use. “, concludes the organization. But better just in case make sure to call on a high-performance network.

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