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An upper bound on coefficient of transmission of microwave leakage into biological tissues

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Kamal AA, Al-Badwaihy K, Hashish E · 1976

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Near-field microwave exposures penetrate tissue more effectively than safety standards assume, potentially making close-range EMF more hazardous.

Plain English Summary

Summary written for general audiences

This 1976 technical study examined how microwave radiation penetrates biological tissues, finding that near-field exposures (close to the source) can be more dangerous than current safety standards account for. The research showed that microwaves can transmit into living tissue more effectively in near-field conditions than the plane wave models used to set safety standards assume.

Why This Matters

This foundational work from 1976 identified a critical flaw in how we measure EMF safety that persists today. Current exposure limits are based on simplified plane wave models that assume you're far from the radiation source. But the reality is most of our EMF exposure happens in the near field, when we hold phones against our heads or stand close to WiFi routers and microwave ovens. The study demonstrates that near-field exposures can penetrate tissue more effectively than safety standards predict, meaning actual absorption could exceed what regulators consider safe. This research helps explain why laboratory studies often find biological effects at exposure levels deemed 'safe' by current standards. The disconnect between how safety limits are set and how we actually encounter EMF in daily life represents a fundamental problem in radiation protection that regulatory agencies have yet to adequately address.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
Kamal AA, Al-Badwaihy K, Hashish E (1976). An upper bound on coefficient of transmission of microwave leakage into biological tissues.
Show BibTeX
@article{an_upper_bound_on_coefficient_of_transmission_of_microwave_leakage_into_biologic_g6713,
  author = {Kamal AA and Al-Badwaihy K and Hashish E},
  title = {An upper bound on coefficient of transmission of microwave leakage into biological tissues},
  year = {1976},
  
  
}

Quick Questions About This Study

Near-field exposures occur close to the source where electromagnetic fields behave differently, potentially allowing deeper tissue penetration than the plane wave models used for safety standards predict.
Safety standards assume simple plane wave exposures that occur far from sources, but most real-world exposures happen in near fields where transmission into tissue can be significantly higher.
No, safety standards are based on plane wave models that don't accurately represent near-field conditions where most human EMF exposure actually occurs in daily life.
Researchers use near-field setups to achieve high field levels needed for experiments, but this creates conditions different from the plane wave assumptions underlying safety standards.
Transmission coefficient measures how much microwave energy penetrates into biological tissue. Higher coefficients in near fields mean more energy absorption than safety models predict.