A Review of Selected Biological Effects and Dosimetric Data Useful for Development of Radiofrequency Safety Standards for Human Exposure
R.A. Tell, F. Harlen · 1979
RF safety standards may be 10 times too high for frequencies below 1 GHz where human bodies absorb significantly more energy.
Plain English Summary
This 1979 government review examined how radiofrequency radiation heats human tissue to establish safe exposure limits. The analysis found that the widely-used 10 mW/cm² safety standard provides adequate protection above 1 GHz frequencies, but may be too high by up to 10 times for lower frequencies where the body absorbs more energy.
Why This Matters
This foundational safety review reveals a critical gap in our RF exposure standards that persists today. The science demonstrates that frequencies below 1 GHz create body resonances that dramatically increase energy absorption, yet our safety limits don't adequately account for this physics. What this means for you: many wireless devices operate in these problematic frequency ranges, including cell towers, WiFi, and older cell phones. The reality is that thermal-based safety standards ignore non-thermal biological effects entirely, focusing only on tissue heating. This 45-year-old analysis already questioned whether our exposure limits were protective enough, yet regulatory agencies have largely maintained the same thermal-only approach despite mounting evidence of biological effects at non-heating levels.
Finding
On the basis of available data, it is concluded that the safe value for continuous exposure to 10 mW/cm², widely used in Western countries, appears to provide an adequate margin of safety for both occupational and environmental exposure for frequencies above about 1 GHz.
In their words
“On the basis of available data, it is concluded that the safe value for continuous exposure to 10 mW/cm², widely used in Western countries, appears to provide an adequate margin of safety for both occupational and environmental exposure for frequencies above about 1 GHz.”
Figures from the Original Paper
Diagrams extracted from the original research document.
Exposure Information
Specific exposure levels were not quantified in this study.
Show BibTeX
@article{a_review_of_selected_biological_effects_and_dosimetric_data_useful_for_developme_g4021,
author = {R.A. Tell and F. Harlen},
title = {A Review of Selected Biological Effects and Dosimetric Data Useful for Development of Radiofrequency Safety Standards for Human Exposure},
year = {1979},
}