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Updated: Mar 16, 2026

Implantation and Evaluation of Melanoma in the Murine Choroid via Optical Coherence Tomography
Published on: December 2, 2022
Tumor-specific frequencies and ocular melanoma
Samuel Milham1, David Stetzer2
1a Washington State Health Department , Olympia WA , USA.
Kilohertz frequencies from industrial electric motors may be linked to rare ocular melanoma cases near a natural gas facility. Electrical practices allowed these frequencies to travel through the earth, potentially causing environmental exposure.
Area of Science:
- Environmental Science
- Occupational Health
- Oncology
Background:
- Variable frequency drives (VFDs) on electric motors generate specific kilohertz frequencies.
- A rare cancer, ocular melanoma, has been observed in a high school and neighborhood near a liquid natural gas facility.
- The electric utility utilizes the earth as a conduit for return currents, potentially facilitating widespread exposure.
Purpose of the Study:
- To investigate the association between environmental kilohertz frequencies and ocular melanoma.
- To analyze the characteristics of electrical waveforms and spectra near the affected population and industrial site.
- To understand the role of utility grounding practices in environmental electromagnetic exposure.
Main Methods:
- Measurements of neutral-to-earth voltage waveforms and spectra were taken near the high school and at a distant gas pipeline location.
- Comparison of frequency spectra to identify common peaks.
- Analysis of electrical utility practices regarding earth return currents.
Main Results:
- Identical neutral-to-earth voltage waveforms and spectra were found at both the high school and the gas pipeline (2.3 miles away).
- Peak frequencies of 7440 Hz and 19,980 Hz were consistently detected at both locations.
- The findings suggest a link between VFDs, earth-based current conduction, and environmental electromagnetic frequencies.
Conclusions:
- Specific kilohertz frequencies originating from VFDs at the natural gas facility appear to be associated with ocular melanoma cases.
- The practice of using the earth as a current conduit enables the propagation of these potentially harmful frequencies over significant distances.
- Further research is warranted to confirm the causal link and explore mitigation strategies for electromagnetic exposure from industrial sources.
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