6,486 Studies Reviewed. 85.2% of Original Studies Found Biological Effects. The Evidence is Clear.

MEASUREMENT OF RADIOFREQUENCY POWER ABSORPTION IN MONKEYS, MONKEY PHANTOMS, AND HUMAN PHANTOMS EXPOSED TO 10-50 MHZ FIELDS

Bioeffects Seen

Stewart J. Allen, William D. Hurt, Jerome H. Krupp, James A. Ratliff, Carl H. Durney · 1976

Share:

Live monkey testing in 1976 found theory excellent for predicting RF power absorption in phantoms at 10-50 MHz but not in primates.

Plain English Summary

Summary written for general audiences

This 1976 study measured how much radiofrequency energy (10-50 MHz) was absorbed by live monkeys and human-like models when exposed to RF fields. Researchers used both living animals and artificial phantoms to understand power absorption patterns across different frequencies, comparing experimental results with theoretical predictions.

Why This Matters

This research measured RF power absorption directly in live monkeys alongside saline-filled monkey and human phantoms at 10-50 MHz and compared the results with theory. Theory predicted power absorption in the phantoms excellently, but the more complex ellipsoid model will be required to predict power absorption in primates. The power absorbed varies as a function of the frequency of the incident RF field, so quantifying it in man and experimental animals over a broad range of frequencies is necessary to define the effects of RF radiation on man.

Figures from the Original Paper

Diagrams extracted from the original research document.

diagramPage 6 - Figure 1. HF band far-field exposure device with MCL transmitter and differential power meter.
diagramPage 7 - Block diagram of differential power measurement system as installed in Brooks AFB Radiofrequency Electromagnetic Radiation Research Facility.
diagramPage 8 - Figure 3. Human phantom inside 'far-field' exposure volume in H-polarization orientation.
diagramPage 9 - AI-described figure: Figure 4. Ten prolate spheroid monkey phantoms above center conductor exposed in E-polarization.
diagramPage 10 - Figure 5. Ten rhesus monkeys above center conductor exposed in E-polarization.
Cite This Study
Stewart J. Allen, William D. Hurt, Jerome H. Krupp, James A. Ratliff, Carl H. Durney (1976). MEASUREMENT OF RADIOFREQUENCY POWER ABSORPTION IN MONKEYS, MONKEY PHANTOMS, AND HUMAN PHANTOMS EXPOSED TO 10-50 MHZ FIELDS.
Show BibTeX
@article{measurement_of_radiofrequency_power_absorption_in_monkeys_monkey_phantoms_and_hu_g4662,
  author = {Stewart J. Allen and William D. Hurt and Jerome H. Krupp and James A. Ratliff and Carl H. Durney},
  title = {MEASUREMENT OF RADIOFREQUENCY POWER ABSORPTION IN MONKEYS, MONKEY PHANTOMS, AND HUMAN PHANTOMS EXPOSED TO 10-50 MHZ FIELDS},
  year = {1976},
  
  
}
No DOI on file for this study.

Quick Questions About This Study

Researchers tested radiofrequency fields from 10-50 MHz, at 10, 20, 30, 40 and 50 MHz.
Live monkeys were measured and compared with equivalent monkey phantoms to determine the adequacy of the prolate spheroid model. Theory was excellent for predicting power absorption in the phantom, but the more complex ellipsoid model will be required to predict power absorption in primates.
The power absorbed by biological systems varies as a function of the frequency of the incident radiofrequency field. In this study, the power absorbed by the phantoms rose as frequency increased from 10 to 50 MHz.
Scientists used differential power measurement techniques, which display the incident, reflected and outflowing power of the exposure chamber to determine how much RF energy was absorbed by the phantoms and monkeys.
The prolate spheroid phantoms represented man (one 70-kg phantom) and monkey (twenty 3.5-kg phantoms) and were filled with saline solution having a conductivity of 0.6 mho per meter. Theory was excellent for predicting power absorption in the phantoms, but the more complex ellipsoid model will be required to predict power absorption in primates.