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A Review of International Microwave Exposure Guides

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JON R. SWANSON, VERNON E. ROSE, CHARLES H. POWELL · 1970

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International microwave safety standards have been inconsistent since 1970, with some countries recognizing biological effects at lower exposure levels than U.S. guidelines.

Plain English Summary

Summary written for general audiences

This 1970 review examined international microwave exposure standards, comparing the U.S. Air Force's 10 milliwatt per square centimeter limit established in 1958 with guidelines from England, Russia, Poland and other countries. The study found significant differences between national exposure criteria and highlighted how various countries incorporated different biological factors into their safety standards.

Why This Matters

This historical review reveals how fractured international microwave safety standards were from the very beginning of the microwave age. The fact that countries like Russia and Poland adopted more stringent exposure limits than the U.S. suggests they recognized biological effects at lower power levels. What's particularly striking is that this fragmentation occurred in 1970, when microwave exposure was primarily occupational. Today, billions of people carry microwave-emitting devices in their pockets, yet we still lack unified international standards. The 10 milliwatt per square centimeter limit established by the U.S. Air Force in 1958 was based on thermal effects only, ignoring the growing evidence of non-thermal biological responses that other countries were beginning to acknowledge.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
JON R. SWANSON, VERNON E. ROSE, CHARLES H. POWELL (1970). A Review of International Microwave Exposure Guides.
Show BibTeX
@article{a_review_of_international_microwave_exposure_guides_g7303,
  author = {JON R. SWANSON and VERNON E. ROSE and CHARLES H. POWELL},
  title = {A Review of International Microwave Exposure Guides},
  year = {1970},
  
  
}

Quick Questions About This Study

The United States Air Force established the first official U.S. microwave exposure limit in 1958, setting a maximum of 10 milliwatts per square centimeter for military operations involving radar and range-finder equipment.
Countries interpreted the scientific evidence differently, with some nations like Russia and Poland incorporating additional biological factors beyond thermal effects into their exposure criteria, leading to more restrictive limits than U.S. guidelines.
The development of radar and range-finder equipment in the early 1940s led to increased use of microwave generating equipment, creating the first significant occupational exposures and need for safety guidelines.
Several countries including England, Russia, and Poland had adopted microwave exposure criteria that differed from U.S. guidelines, often incorporating broader biological response factors beyond the single exposure limit approach.
The 1958 U.S. Air Force limit of 10 milliwatts per square centimeter was established primarily for military radar operations, representing one of the earliest attempts to set occupational microwave exposure standards.