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Evaluation and Control of Exposures in Repairing Microwave Ovens

Bioeffects Seen

Vernon E. Rose, Gerald A. Gellin, M.D., Charles H. Powell, Sc.D., H. G. Bourne · 1969

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Microwave oven repair workers faced radiation levels exceeding 10 mW/cm², but copper mesh screening effectively reduced dangerous occupational exposure.

Plain English Summary

Summary written for general audiences

This 1969 study examined microwave oven repair workers who were exposed to dangerous levels of microwave radiation exceeding 10 mW/cm² while working on energized magnetrons. Researchers found these occupational exposures posed serious health risks including cataracts and thermal damage, but developed an effective copper mesh screening solution to reduce worker exposure below safety limits.

Why This Matters

This early occupational health study reveals a critical reality about microwave radiation exposure that extends far beyond consumer use. While we focus on the relatively low emissions from properly functioning microwave ovens, repair technicians faced radiation levels that were orders of magnitude higher than current safety standards. The fact that simple copper mesh screening could dramatically reduce exposure demonstrates both the reality of the hazard and the effectiveness of proper shielding. What makes this particularly relevant today is that it shows how occupational EMF exposures can far exceed what consumers typically encounter, yet receive little attention. The study's documentation of potential cataracts and thermal damage from microwave radiation provides early evidence of biological effects that remain concerns in our current wireless world, where similar frequencies are used in various technologies.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
Vernon E. Rose, Gerald A. Gellin, M.D., Charles H. Powell, Sc.D., H. G. Bourne (1969). Evaluation and Control of Exposures in Repairing Microwave Ovens.
Show BibTeX
@article{evaluation_and_control_of_exposures_in_repairing_microwave_ovens_g4043,
  author = {Vernon E. Rose and Gerald A. Gellin and M.D. and Charles H. Powell and Sc.D. and H. G. Bourne},
  title = {Evaluation and Control of Exposures in Repairing Microwave Ovens},
  year = {1969},
  
  
}

Quick Questions About This Study

Workers were exposed to microwave radiation levels exceeding 10 mW/cm² at their face and body while repairing energized magnetrons. This exceeded safety standards and posed risks of cataracts and thermal damage to skin and deeper tissues.
The copper mesh screening provided a simple, effective, and inexpensive control that reduced worker exposure to levels well below 10 mW/cm² while still allowing visual observation of the magnetron for malfunction detection during repairs.
The study identified potential biological side effects including cataracts and thermal damage to skin and deeper body structures from close proximity exposure to energized magnetrons during repair and testing procedures.
Repair workers had to place their faces and bodies close to energized magnetrons during testing and repair procedures, creating occupational exposures far exceeding what consumers experience from properly functioning ovens.
Eight microwave oven repairmen underwent medical evaluation to assess potential biological effects from their occupational exposure to microwave radiation levels that exceeded safety standards during repair work.