AN ATTEMPT TO EVALUATE THE EXPOSURE OF OPERATORS OF PORTABLE RADIOS AT 30 MHZ
Q. Balzano, O. Garay, F.R. Steel · 1970
1970 research examined EMF exposure from 30 MHz portable radios using phantom models, establishing early occupational safety protocols.
Plain English Summary
This 1970 technical report examined electromagnetic field exposure levels experienced by operators using portable radios at 30 MHz frequency. Researchers used phantom models and tissue simulation techniques to measure power density and assess potential exposure risks. This represents early scientific efforts to understand occupational EMF exposure from two-way radio equipment.
Why This Matters
This study represents pioneering work in occupational EMF exposure assessment, examining portable radios operating at 30 MHz during an era when such devices were becoming widespread in professional settings. The research focus on phantom models and tissue simulation demonstrates early recognition that proximity to transmitting devices creates significant exposure scenarios. What makes this particularly relevant today is that 30 MHz falls within the same general frequency range as many modern wireless technologies, and the fundamental physics of near-field exposure remain unchanged. The reality is that portable radio operators then faced similar exposure patterns to what we see with modern handheld devices, just at different frequencies and power levels. This early occupational health research laid groundwork for understanding how close-contact EMF sources affect the human body.
Finding
The temperature measurements show that a deposition rate substantially smaller than 1 mW/gr is caused by the radios used in the tests.
In their words
“The temperature measurements show that a deposition rate substantially smaller than 1 mW/gr is caused by the radios used in the tests.”
Figures from the Original Paper
Diagram extracted from the original research document.
Exposure Information
Specific exposure levels were not quantified in this study. Duration: 1 minute
Study Details
To evaluate the exposure of operators of portable radios at 30 MHz by measuring energy deposition in simulated human tissue.
Simulated human tissue was used in the form of muscle and fat/bone phantoms. The muscle mixture had ...
No detectable temperature increase was found in the phantoms for a one-minute exposure, even when an...
The results indicate that there is no thermal hazard present for such low deposition rates. Even at maximum power density levels, the exposure from portable radios at 30 MHz does not cause appreciable temperature increments in simulated tissue.
Show BibTeX
@article{an_attempt_to_evaluate_the_exposure_of_operators_of_portable_radios_at_30_mhz_g5308,
author = {Q. Balzano and O. Garay and F.R. Steel},
title = {AN ATTEMPT TO EVALUATE THE EXPOSURE OF OPERATORS OF PORTABLE RADIOS AT 30 MHZ},
year = {1970},
}