New Year's science: Xiaomi and OnePlus phones have the highest radiation? Maybe not as big as bananas
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Text | Zhao Chenxi
Report from Leiphone.com (leiphone-sz)
Recently, a ranking list of radiation from different brands of mobile phones was leaked on the Statista website. Statista claimed, "Even if they are cheap, would you buy mobile phones that emit a lot of radiation?" "According to years of research reports, living under the radiation of smartphones for a long time can easily cause brain tumors and affect male fertility."
(Leiphone.com Note: Statista’s ranking of mobile phone radiation of different brands)
Statista has compiled a table showing the radiation levels of smartphones tested by the German Federal Office for Radiation Protection, the Bundesamt für Strahlenschutz. The list shows the specific absorption rate (SAR) of each tested phone. SAR expresses the rate at which the human body absorbs radiation in terms of power per mass of tissue (W/kg).
According to the Statista report, Xiaomi Mi A1, Mi Max 3, OnePlus 5T and OnePlus 6T radiate the most (from 1.55 W to 1.78 W). Xiaomi issued a statement: All Xiaomi smartphones sold in India comply with the law on SAR values and are well within the limits. The SAR values of Mi A1 in India are 1.26 W/kg (head) and 0.17 W/kg (body weight). The values shared in the above report are from tests in Germany (where the conditions and standards for SAR testing are different from those in India), so they cannot be compared with the SAR values in India. For reference, the maximum limit in India is 1.6 W/kg, while in Germany, the limit is 2.0 W/kg.
Radiation brings to mind mushroom clouds and genetic mutations, but is that really the case? Radiation is a neutral term that applies to everything from light to heat and even sound. People are exposed to some kind of radiation all the time. What people should worry about is the type and intensity of radiation they are exposed to. There are only two types of radiation to worry about: ionizing radiation and non-ionizing radiation.
Ionizing radiation is electromagnetic radiation that produces enough energy to separate electrons from atoms, that is, the energy is strong enough to ionize atoms. This radiation is carcinogenic and can affect any organism, from bacteria to any organism, at high enough doses. It is worth noting that ultraviolet light is also ionizing radiation. Ionizing radiation has enough energy to travel thousands of light years in space. Ultraviolet light strikes humans in tiny doses.
For mobile phones and mobile phone base stations, it is the latter, that is, non-ionizing radiation, which is almost completely harmless. This radiation does not have enough energy to ionize molecules, but it can cause a certain amount of local heating at a strong enough intensity. Microwave ovens are also based on this principle, heating by consuming a lot of electricity.
The harmless non-ionizing radiation emitted by mobile phones and mobile phone base stations is far below any known harmful threshold, and there is no point in worrying too much. The emission intensity of mobile phones is far lower than 400-600 times that of microwaves, and much lower than the electromagnetic radiation of household light bulbs. Senior radiation scientist Bhavin Jankharia said, "Today, or even in the past 8-10 years, there is no absolutely reliable data to show that mobile phone signals will produce harmful radiation."
Interestingly, bananas also emit some form of ionizing radiation due to their potassium content. Or if you often fly, then the amount of radiation on your body is much greater than that of other people. Bananas may emit more radiation than mobile phones. Interesting but true!
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