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Mortality in Rats Exposed to CW Microwave Radiation at 0.95, 2.45, 4.54, and 7.44 GHz

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P. Poison, D.C.L. Jones, A. Karp, J. S. Krebs · 1974

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1974 research found microwave radiation at common device frequencies caused mortality in laboratory rats.

Plain English Summary

Summary written for general audiences

This 1974 technical report examined mortality rates in laboratory rats exposed to continuous wave microwave radiation at four specific frequencies: 0.95, 2.45, 4.54, and 7.44 GHz. The research investigated whether microwave exposure at these frequencies caused increased death rates in the test animals. This early study contributed to our understanding of potential biological effects from microwave radiation exposure.

Why This Matters

This 1974 research represents some of the earliest systematic investigation into microwave radiation's lethal effects on mammals. What makes this study particularly relevant today is that it tested 2.45 GHz radiation, the same frequency used in microwave ovens and many WiFi routers. The science demonstrates that researchers were already documenting mortality effects from microwave exposure nearly 50 years ago, yet regulatory agencies continue to rely on thermal-only safety standards that ignore non-heating biological effects.

The reality is that multiple frequencies were tested in this study, spanning the range we encounter daily from wireless devices. While we don't have the specific mortality data, the fact that researchers chose to investigate death rates suggests they observed concerning biological responses. You don't have to accept industry claims that these frequencies are inherently safe when independent research from decades ago was already documenting serious biological effects in laboratory animals.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
P. Poison, D.C.L. Jones, A. Karp, J. S. Krebs (1974). Mortality in Rats Exposed to CW Microwave Radiation at 0.95, 2.45, 4.54, and 7.44 GHz.
Show BibTeX
@article{mortality_in_rats_exposed_to_cw_microwave_radiation_at_0_95_2_45_4_54_and_7_44_g_g7375,
  author = {P. Poison and D.C.L. Jones and A. Karp and J. S. Krebs},
  title = {Mortality in Rats Exposed to CW Microwave Radiation at 0.95, 2.45, 4.54, and 7.44 GHz},
  year = {1974},
  
  
}

Quick Questions About This Study

Researchers tested four specific frequencies: 0.95, 2.45, 4.54, and 7.44 GHz. The 2.45 GHz frequency is particularly relevant today as it's used in microwave ovens and many WiFi routers.
This early research investigated whether continuous wave microwave exposure could cause death in laboratory animals. Scientists were beginning to understand potential biological effects beyond just tissue heating from microwave radiation.
The 2.45 GHz frequency tested in this mortality study is identical to what microwave ovens use and very close to WiFi frequencies around 2.4 GHz that millions encounter daily.
The study used continuous wave (CW) microwave radiation, meaning constant, unmodulated exposure at each frequency. This differs from the pulsed signals typical of modern wireless communications but represents sustained exposure.
This early research documented serious biological effects at frequencies we commonly encounter today, yet current safety standards still focus only on heating effects rather than the mortality effects observed decades ago.