Note: This study found no significant biological effects under its experimental conditions. We include all studies for scientific completeness.
Frequency spectra from current vs. magnetic flux density measurements for mobile phones and other electrical appliances.
Straume A, Johnsson A, Oftedal G, Wilén J · 2007
View Original AbstractCommon EMF measurement shortcuts can overestimate phone exposures by 220% or underestimate appliance exposures by 230%, undermining research reliability.
Plain English Summary
Norwegian researchers compared two methods for measuring electromagnetic field exposure from mobile phones and household appliances like hair dryers and electric drills. They found that using battery current measurements (a common shortcut in research) can overestimate phone exposures by up to 220% or underestimate appliance exposures by up to 230% compared to direct magnetic field measurements. This means many EMF exposure studies may have inaccurate data, highlighting the need for more precise measurement techniques.
Study Details
The frequency spectra of electromagnetic fields have to be determined to evaluate human exposure in accordance to ICNIRP guidelines. In the literature, comparisons with magnetic field guidelines have been performed by using the frequency distribution of the current drawn from the battery. In the present study we compared the frequency spectrum in the range 217 Hz to 2.4 kHz of the magnetic flux density measured near the surface of a mobile phone with the frequency spectrum of the supply current
By using the multiple frequency rule, recommended in the ICNIRP guidelines, we estimated the magneti...
The frequency distributions obtained from the two measurement methods are not equal. The frequency c...
There was no indication that the devices studied would exceed the reference levels at the working distances normally used.
Show BibTeX
@article{a_2007_frequency_spectra_from_current_3426,
author = {Straume A and Johnsson A and Oftedal G and Wilén J},
title = {Frequency spectra from current vs. magnetic flux density measurements for mobile phones and other electrical appliances.},
year = {2007},
url = {https://pubmed.ncbi.nlm.nih.gov/17846524/},
}