Measurements of Radiofrequency Radiation with a Body-Borne Exposimeter in Swedish Schools with Wi-Fi

Our research group published recently a study on radiofrequency (RF) radiation in schools using an exposimeter. RF emissions in the classroom were measured by the teachers in order to approximate the children’s exposure. Teachers in grades 7–12 carried a body-borne exposimeter, EME-Spy 200, in school during 1–4 days of work. Eighteen teachers from seven schools participated. The mean exposure to RF radiation ranged from 1.1 to 66.1 μW/m2. The highest mean level, 396.6 μW/m2, occurred during 5 min of a lesson when the teacher let the students stream and watch YouTube videos. Maximum peaks went up to 82,857 μW/m2 from mobile phone uplink.  The exposure levels varied between the different Wi-Fi systems, and if the students were allowed to use their own smartphones on the school’s Wi-Fi network or if they were connected to GSM/3G/4G base stations outside the school. An access point over the teacher’s head gave higher exposure compared with a school with a wired Internet connection for the teacher in the classroom. All values were far below International Commission on Non-Ionizing Radiation Protection’s reference values, but most mean levels measured were above the precautionary target level of 3–6 μW/m2 as proposed by the Bioinitiative Report. The length of time wireless devices are used is an essential determinant in overall exposure. Measures to minimize children’s exposure to RF radiation in school would include preferring wired connections, allowing laptops, tablets and mobile phones only in flight mode and deactivating Wi-Fi access points, when not used for learning purposes.

In Table 10 in the article examples of methods to reduce children’s exposure to RF radiation in schools are given

1. Wired connection to both teachers and students and no wireless networks or devices in school is the optimal choice. If this is not possible:
2. Wired connection to each classroom
a. to the teacher’s laptop,
b. for the students to download large files and videos.
3. To reduce exposure from Wi-Fi networks in school:
a. turn off Wi-Fi access points when not used for learning purposes,
b. position Wi-Fi access points outside of classrooms,
c. use directional Wi-Fi access points, which radiate into the direction of the client’s device.
4. Keep laptops and tablets in flight mode when Internet is not needed for learning purposes.
5. Wired connection to a landline telephone in each classroom could minimize the need for mobile phones for contact.
6. Mobile phones, including smart phones, could be left at home or collected in turned off mode. If allowed, they should be carried only in flight mode during school hours.

 

Advertisements

Monsanto, glyphosate (Roundup) and Swedish cancer epidemiologist

Documents are now becoming publicly available in the US glyphosate litigation. Here are some of the first results indicating secret work by the Swedish cancer epidemiologist Hans-Olov Adami for Monsanto. The whole document can be found here.

It includes Monsanto emails regarding Hardell study rebuttal:

  • “We are creating a scientific outreach network of prominent epidemiologists in Europe and the U.S., including Dimitrios Trichopoulos (Harvard/Greece) and Hans-Olov Adami (Harvard/Sweden), who will assist us in defending glyphosate. we are planning meetings with them and with four prominent epidemiologists in each of the following areas; UK (this meeting is set for August 17th), Scandinavia (targeting sept.), Italy/Greece (targeting August), Netherlands/France/Germany (targeting Sept.) and the US (targeting October). The purpose of these meetings is to raise awareness of the limitations of Hardell’s research and gain support for glyphosate in the epidemiologic community worldwide.”
  • “Hans-Olav and Dimitrios were good friends of John Acquavella. We worked with them a lot when John was here.”

John Acquavella was epidemiologist at Monsanto defending herbicides. This attack on our studies concerns our findings of increased risk for non-Hodgkin lymphoma and use of herbicides including glyphosate. Glyphosate is a large product for Monsanto used in e.g. genetically modified crops.

These documents are new and were filed 28 October 2017. The above paragraph goes back to activities in 1999. There are much more documents on glyphosate that Monsanto has been forced to disclose in the US litigation. However, they are so new that they are not organized yet.

Maybe this is the tip of an iceberg similar to that released about tobacco and lung cancer since before in US litigations revealing scientists with hidden industry work. Regarding Adami – his industry defense of cancer causing agents is especially remarkable since he at the same time gained large grants from the Swedish Cancer Fund aimed at preventing cancer.

More about ’Corporate Ties that Bind’ can be read in a book published this year. Some of the Adami industry activities can be found in .e.g. Chapter 9 ’Greenwashing: The Swedish Experience’ by Bo Walhjalt.

Finally it should be noted that I am not aware of any contacts from Monsanto regarding our studies. I have not contacted journalists about our findings. I am quite neutral to Monsanto with a professional attitude to that company.