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Note: This study found no significant biological effects under its experimental conditions. We include all studies for scientific completeness.

DNA & Genetic Damage

Cytogenetic effects of 18.0 and 16.5 GHz microwave radiation on human lymphocytes in vitro.

No Effects Found

Hansteen IL, Lågeide L, Clausen KO, Haugan V, Svendsen M, Eriksen JG, Skiaker R, Hauger E, Vistnes AI, Kure EH. · 2009

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High-frequency microwave radiation showed no clear genetic damage to human cells, but researchers cautioned against concluding safety for pulsed exposures.

Plain English Summary

Summary written for general audiences

Norwegian researchers exposed human immune cells (lymphocytes) to high-frequency microwave radiation at levels similar to industrial applications for 53 hours to test for DNA damage. They found no statistically significant genetic damage from either continuous 18.0 GHz or pulsed 16.5 GHz radiation, though the pulsed exposure showed a non-significant trend toward increased genetic abnormalities that the researchers said needs further study.

Why This Matters

This study adds to the limited research on high-frequency microwave effects on human cells, testing frequencies well above those used in consumer devices like cell phones (which operate around 0.7-2.7 GHz). The exposure levels of 1.0 W/m² and 10 W/m² are significantly higher than typical environmental exposures but relevant for occupational settings near radar or satellite equipment. While the researchers found no clear genetic damage, their cautionary note about the 16.5 GHz pulsed exposure deserves attention. The science demonstrates that even negative studies can reveal concerning trends, and the authors' reluctance to draw a definitive conclusion about safety reflects responsible scientific interpretation. What this means for you is that while these specific high frequencies may not cause immediate genetic damage at the tested levels, the research landscape remains incomplete, particularly for pulsed exposures.

Exposure Details

Power Density
0.1 mW/cm²
Source/Device
18.0 GHz
Exposure Duration
53 hours

Exposure Context

This study used 0.1 mW/cm² for radio frequency:

Building Biology guidelines are practitioner-based limits from real-world assessments. BioInitiative Report recommendations are based on peer-reviewed science. Check Your Exposure to compare your own measurements.

Where This Falls on the Concern Scale

Study Exposure Level in ContextStudy Exposure Level in ContextThis study: 0.1 mW/cm²Extreme Concern - 1,000 µW/m²FCC Limit - 10M µW/m²Effects observed in the Extreme Concern range (Building Biology)FCC limit is 10 times higher than this level
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 18 GHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 18 GHzPower lines50/60 HzCell phones~1 GHzWiFi2.4 GHzLogarithmic scale

Study Details

In this study, cytogenetic effects of microwave radiation alone or in combination with mitomycin C (MMC) were investigated.

Lymphocytes from two smoking and four non-smoking donors were exposed for 53 hours in vitro to 1.0 W...

No synergistic effect was observed in cells exposed to combinations of microwave radiation and in vi...

Neither 18.0 GHz continuous-wave nor 16.5 GHz pulsed-wave exposure to human lymphocytes in vitro induced statistically significant increases in chromosomal aberration frequencies. 16.5 GHz pulsed-wave exposure requires further documentation before a true negative conclusion can be drawn.

Cite This Study
Hansteen IL, Lågeide L, Clausen KO, Haugan V, Svendsen M, Eriksen JG, Skiaker R, Hauger E, Vistnes AI, Kure EH. (2009). Cytogenetic effects of 18.0 and 16.5 GHz microwave radiation on human lymphocytes in vitro. Anticancer Res. 29(8):2885-2892, 2009.
Show BibTeX
@article{il_2009_cytogenetic_effects_of_180_3063,
  author = {Hansteen IL and Lågeide L and Clausen KO and Haugan V and Svendsen M and Eriksen JG and Skiaker R and Hauger E and Vistnes AI and Kure EH.},
  title = {Cytogenetic effects of 18.0 and 16.5 GHz microwave radiation on human lymphocytes in vitro.},
  year = {2009},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/19661291/},
}
PubMed: 19661291

Cited By (6 papers)

Quick Questions About This Study

A 2009 Norwegian study found no significant genetic damage to human lymphocytes exposed to 18.0 GHz continuous microwave radiation for 53 hours. The researchers tested levels similar to industrial applications and observed no statistically significant increases in chromosomal abnormalities.
Norwegian researchers found no significant genetic damage from either continuous 18.0 GHz or pulsed 16.5 GHz radiation. However, the pulsed exposure showed a non-significant trend toward increased genetic abnormalities that requires further study to confirm safety.
Human lymphocytes exposed to 18.0 GHz and 16.5 GHz microwave radiation for 53 hours showed no statistically significant genetic damage in a 2009 study. The extended exposure duration tested cellular resilience at levels comparable to industrial applications.
The 2009 Norwegian study found no synergistic effect when human lymphocytes were exposed to both microwave radiation and tobacco smoke compounds. Cells pre-exposed to tobacco smoke did not show increased genetic damage when combined with microwave exposure.
Norwegian researchers specifically tested 18.0 GHz continuous-wave and 16.5 GHz pulsed-wave radiation on human immune cells in 2009. While 18.0 GHz showed no genetic effects, the 16.5 GHz pulsed exposure requires additional research for definitive safety conclusions.