Recently, a video has been circulating online that shows a sudden increase in the radiation produced when the phone is charging.
The video shows that the instrument measured more than 300 electromagnetic radiation while charging, and after unplugging the charging cable of the mobile phone, the instrument measured zero radiation.
So is there really that much radiation when the phone is charging? In response, experts explain that cell phone radiation is measured by a metric of specific absorption rate (SAR).
The SAR value is the specific absorption rate, averaged over an arbitrary 6-minute period, per kilogram of electromagnetic radiation energy absorbed by human tissue (watts).
Using cell phone radiation as an example, SAR refers to the rate at which radiation is absorbed by the soft tissue of the head, and the lower the SAR value, the less radiation is absorbed by the brain.
However, this does not mean that the SAR rating is directly related to the health of the mobile phone user.
According to the data tested by experts, the SAR value in the state of charging the phone is 10g:0.213W/kg, which is a slight increase compared to the case without charging (10g:0.158W/kg) and does not show a substantial increase.
For the data of the online video of the test, experts explain that it is actually because of the radiation brought by the alternating current when the phone is charging, and not the radiation of the phone itself.
When charged, the phone's SAR varies, sometimes a little larger, sometimes a little smaller, but in any case, there are no changes like these tens or even hundreds of times.
Specifically, this is actually an industrial frequency electric field brought about when the phone is charging, that is, the electric field generated by the charge of 50Hz or 60Hz sine change with time, there is a current will have such an electric field, which is also in line with the requirements of national standards.
In addition, the evidence for listing as a Class 2B carcinogen comes from 20 years of research prior to 2011, when the cell phones we used were hardly the same products we use now.
So what we are looking at before 2011 is the relationship between the occurrence of glioma near the ear and the time spent answering the phone unilaterally and the time spent answering the phone, all of which are based on the usage habits of these phones.
And we now have phones that have at least half of our calls replaced by other mobile software, so the smartphone now also reduces some of the radiation risk posed by the phone in one way.