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Dielectric Properties of the Human Body for Wave-lengths in the 1-10 cm. Range

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T. S. England · 1950

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This 1950 study established foundational science on how microwave radiation interacts with human tissues at frequencies now used by modern wireless devices.

Plain English Summary

Summary written for general audiences

This 1950 study measured how microwave radiation at three different wavelengths (1.27 cm, 3.18 cm, and 10 cm) interacts with human body tissues taken from surgical operations. Researchers analyzed the dielectric properties of various tissues to understand how microwaves penetrate and affect different parts of the human body. This foundational research helped establish how electromagnetic fields interact with biological tissues.

Why This Matters

This pioneering 1950 research represents some of the earliest scientific investigation into how microwave radiation interacts with human tissue - work that laid the groundwork for understanding EMF bioeffects decades before cell phones existed. The study's focus on wavelengths between 1-10 cm is particularly relevant today, as these frequencies overlap with modern wireless technologies including WiFi, Bluetooth, and cellular communications. What makes this research significant is that it established the basic science of how electromagnetic fields penetrate biological tissues, showing that different body tissues have varying electrical properties that affect EMF absorption. The reality is that this fundamental research on tissue dielectric properties directly informs modern specific absorption rate (SAR) calculations used to supposedly 'protect' us from wireless radiation - yet these safety standards were developed primarily from this type of basic physics research, not comprehensive health studies.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
T. S. England (1950). Dielectric Properties of the Human Body for Wave-lengths in the 1-10 cm. Range.
Show BibTeX
@article{dielectric_properties_of_the_human_body_for_wave_lengths_in_the_1_10_cm_range_g3936,
  author = {T. S. England},
  title = {Dielectric Properties of the Human Body for Wave-lengths in the 1-10 cm. Range},
  year = {1950},
  
  
}

Quick Questions About This Study

The researchers tested three specific microwave wavelengths: 1.27 cm, 3.18 cm, and 10 cm. These wavelengths correspond to frequencies that overlap with modern wireless technologies including WiFi, cellular, and Bluetooth communications used in today's devices.
All tissue specimens except bone were obtained from surgical operations, with measurements conducted immediately afterward at controlled body temperature (37°C). This approach ensured the tissue properties closely matched living human conditions during the dielectric testing.
Dielectric properties determine how electromagnetic fields interact with and penetrate biological tissues. Understanding these properties was essential for developing radar technology and later became foundational for calculating EMF absorption rates in wireless device safety standards.
Researchers maintained tissue samples at 37.0 ± 0.5°C during all measurements. This precise temperature control was critical because dielectric properties change with temperature, and 37°C represents normal human body temperature for accurate biological relevance.
This foundational research on tissue dielectric properties directly informs the specific absorption rate (SAR) calculations used in current wireless device safety standards. The basic physics established in studies like this forms the scientific basis for modern EMF exposure limits.