【Governmental warnings】

The World Health Organization issued a fact sheet regarding electromagnetic fields and public health in 2011. In the fact sheet, the electromagnetic fields produced by mobile phones are classified as possibly carcinogenic to humans. In such a context, many governments have adopted a precautionary principle regarding exposure to cell phone radiation and especially, there have been numerous governmental warnings about children’s use of cellphones.

【Cellphone user manuals recommend customers to keep the cellphone away from the body】

SAR* and description about distance from the head when in use as indicated by each phone manufacturer is shown below.

• Ａｐｐｌｅ
• “Specific Absorption Rate (SAR) refers to the rate at which the body absorbs RF energy. The SAR limit is 1.6 watts per kilogram in countries that set the limit averaged over 1 gram of tissue and 2.0 watts per kilogram in countries that set the limit averaged over 10 grams of tissue. During testing, iPhone radios are set to their highest transmission levels and placed in positions that simulate uses against the head, with no separation, and when worn or carried against the torso of the body, with 5mm separation.”
  “To reduce exposure to RF energy, use a hands-free option, such as the built-in speakerphone, the supplied headphones, or other similar accessories.”
• Ｓａｍｓｕｎｇ
• “Body-worn SAR testing has been carried out using an approved accessory or at a separation　 distance of 2.5 cm (1 inch). To meet RF exposure guidelines during body-worn operation, the device should be in an approved accessory or positioned at least 2.5 cm (1 inch) away from the body. If you are not using an approved accessory, ensure that whatever product is used is free of any metal and that it positions the phone at least 2.5 cm (1 inch) away from the body.”
  “The World Health Organisation has stated that present scientific information does not indicate the need for any special precautions for the use of mobile devices. They recommend that if you are interested in further reducing your exposure then you can easily do so by limiting your usage or simply using a hands-free kit to keep the device away from the head and body.”
• Ｍｏｔｏｒｏｌａ
• “Body-worn SAR testing has been carried out using an approved accessory or at a separation　 distance of 2.5 cm (1 inch). To meet RF exposure guidelines during body-worn operation, the device should be in an approved accessory or positioned at least 2.5 cm (1 inch) away from the body. If you are not using an approved accessory, ensure that whatever product is used is free of any metal and that it positions the phone at least 2.5 cm (1 inch) away from the body.”
  “The World Health Organisation has stated that present scientific information does not indicate the need for any special precautions for the use of mobile devices. They recommend that if you are interested in further reducing your exposure then you can easily do so by limiting your usage or simply using a hands-free kit to keep the device away from the head and body.”
• ＳＯＮＹ
• The highest SAR value as reported to the authorities for this phone model when tested for use by the ear is 0.78 W/kg and when worn on the body is 0.44 W/kg and for WiFi hotspot mode is 0.84 W/kg. For body-worn operation, the phone has been tested when positioned a minimum of 15 mm from the body without any metal parts in the vicinity of the phone or when properly used with an appropriate accessory and worn on the body. For devices which include “WiFi hotspot” functionality, SAR measurements for the device operating in WiFi hotspot mode were taken using a separation distance of 10 mm. Use of third-party accessories may result in different SAR levels than those reported.

*What is SAR value?
The SAR value is a value determined based on scientific evidence, such that radio waves sent from wireless devices such as mobile phones used near the body do not affect human health. It is the average energy amount (watts) of radio waves per unit weight absorbed by a person, and it is called SAR (Specific Absorption Rate). For delicate parts of the body such as eyes and testicles, 1.6 W/kg per gram is tolerated and 2W/kg per 10 grams is taken as an allowable value for a slightly larger locality such as the head. This tolerance value is uniform, irrespective of the age and weight of the user and is indicated by the International Commission on Non-Ionizing Radiation Protection (ICNIRP) as a guideline. The World Health Organization (WHO) has set this value as the regulatory value.
The mobile phones are designed to have the minimum transmission power required for communication with the mobile phone base station. Therefore, SAR value will typically be smaller when actually making phone calls etc. Generally, the closer the distance from the base station, the smaller the output of the mobile phone.

【The children is at greater risk from exposure to carcinogens】

Children’s heads and brains are not miniature adult heads. Their skulls are thinner, the proportion of water is higher, myelin (thought to be like wire insulation for neurons) is still developing, etc. As a result, as shown in Figure, the cellphone radiation penetrates a far larger proportion of the brain. Estimation of the absorption of electromagnetic radiation from a cell phone based on age (Frequency GSM 900 MHz) (Color scale shows the Specific Absorption Rate in W/kg)