Penetration and Thermal Dissipation of Microwaves in Tissues
A. Anne, M. Saito, O. M. Salati, H. P. Schwan · 1962
This foundational 1962 research revealed how microwaves penetrate tissue and generate internal heat, establishing the scientific basis for understanding biological exposure effects.
Plain English Summary
This 1962 technical report examined how microwave radiation penetrates into biological tissues and how that energy converts to heat within the body. The research focused on understanding the physical mechanisms of microwave absorption and thermal effects in tissue, laying groundwork for safety assessments. This early work helped establish the scientific foundation for understanding how microwave exposure affects living systems.
Why This Matters
This 1962 research represents pioneering work in understanding how microwave radiation interacts with biological tissue. At a time when microwave technology was rapidly expanding beyond military applications into civilian use, scientists recognized the need to understand penetration depths and heating patterns in living tissue. The science demonstrates that microwave energy doesn't just heat the surface of tissue like a conventional oven heats food from the outside. Instead, microwaves penetrate into tissue and create heat from within, with the depth depending on frequency and tissue type. What this means for you is that when you use microwave-emitting devices like cell phones, WiFi routers, or microwave ovens, the energy penetrates into your body and converts to heat at the cellular level. While this 1962 work focused on thermal effects, we now know that biological effects can occur at power levels far below those needed to cause detectable heating.
Exposure Information
Specific exposure levels were not quantified in this study.
Study Details
To determine the absorption cross section of human beings to electromagnetic energy and to provide information on the total scattering as well as absorption of energy by lossy dielectric objects.
The research was carried out in two phases: theoretical and experimental. In the theoretical phase, ...
For objects of the size of adult man, the relative absorption cross section is of the order of 50-pe...
The results are in good agreement with theory for the homogeneous sphere. It therefore appears reasonable to account for the layers of skin and fat which are above the muscle tissue in the results upward somewhat.
Show BibTeX
@article{penetration_and_thermal_dissipation_of_microwaves_in_tissues_g5784,
author = {A. Anne and M. Saito and O. M. Salati and H. P. Schwan},
title = {Penetration and Thermal Dissipation of Microwaves in Tissues},
year = {1962},
}