AN EXAMINATION OF CERTAIN BLOOD SERUM CONSTITUENTS IN THE RAT FOLLOWING MICROWAVE IRRADIATION
David W. Fulk, Edward D. Finch · 1972
Microwave radiation at 2,860 MHz caused blood chemistry changes in rats only at heating levels 1,000 times higher than typical phone exposures.
Plain English Summary
Researchers exposed rats to pulsed 2,860 MHz microwave radiation at various power levels for 15 minutes and measured blood chemistry changes. Only the highest exposure level (100 mW/cm²) caused significant changes in blood albumin and phosphorus, but this was accompanied by substantial body heating. Lower exposure levels showed no measurable effects on blood parameters.
Why This Matters
This 1972 study provides important context for understanding microwave exposure thresholds and thermal versus non-thermal effects. The researchers found biological changes only at 100 mW/cm², a power density that caused significant heating - suggesting the effects were thermal rather than from the electromagnetic fields themselves. What makes this particularly relevant today is the exposure comparison: 100 mW/cm² is roughly 1,000 times higher than typical cell phone exposures near your head (around 0.1-1 mW/cm²). The study's conclusion that effects occurred only with "significant heat stress" aligns with current safety standards that focus on preventing tissue heating. However, this research predates our modern understanding of potential non-thermal biological mechanisms, and the 15-minute exposure duration was relatively brief compared to today's chronic, low-level exposures from wireless devices.
Exposure Information
Specific exposure levels were not quantified in this study.
Show BibTeX
@article{an_examination_of_certain_blood_serum_constituents_in_the_rat_following_microwav_g5,
author = {David W. Fulk and Edward D. Finch},
title = {AN EXAMINATION OF CERTAIN BLOOD SERUM CONSTITUENTS IN THE RAT FOLLOWING MICROWAVE IRRADIATION},
year = {1972},
}