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DNA & Genetic Damage156 citations

The correlation between the frequency of micronuclei and specific chromosome aberrations in human lymphocytes exposed to microwave radiation in vitro.

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Garaj-Vrhovac V, Fucic A, Horvat D, · 1992

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Microwave radiation at 7.7 GHz caused significant DNA damage in human blood cells at power levels as low as 0.5 mW/cm2.

Plain English Summary

Summary written for general audiences

Researchers exposed human blood samples to microwave radiation at 7.7 GHz (similar to radar frequencies) and examined the genetic damage in white blood cells. They found significant increases in chromosome breaks and abnormalities, including micronuclei (fragments of damaged DNA) and dicentric chromosomes (chromosomes with two centers). This demonstrates that microwave radiation can directly damage human DNA even at relatively low power levels.

Why This Matters

This early but important study provides direct evidence that microwave radiation causes measurable genetic damage in human cells. The researchers used 7.7 GHz radiation, which falls within the range used by modern radar systems and some industrial applications. What makes this research particularly significant is that genetic damage occurred at all tested power levels, starting as low as 0.5 mW/cm2. The study demonstrates a clear dose-response relationship, meaning more radiation exposure caused more DNA damage. The presence of dicentric chromosomes is especially concerning because these specific abnormalities are considered reliable biomarkers of radiation exposure and are associated with increased cancer risk. While this was an in vitro study using isolated blood samples, it adds to the growing body of evidence showing that non-ionizing radiation can cause biological effects previously thought impossible.

Exposure Details

Power Density
0.5, 10 and 30 µW/m²
Source/Device
7.7 GHz
Exposure Duration
10, 30 and 60 min

Exposure Context

This study used 0.5, 10 and 30 µW/m² 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: 0.5, 10 and 30 µW/m²Extreme Concern - 1,000 uW/m2FCC Limit - 10M uW/m2Effects observed in the Slight Concern rangeFCC limit is 20,000,000x higher than this level
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 7.70 GHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 7.70 GHzPower lines50/60 HzCell phones~1 GHzWiFi2.4 GHz5G mm28 GHzLogarithmic scale

Study Details

The aim of this study is to investigate The correlation between the frequency of micronuclei and specific chromosome aberrations in human lymphocytes exposed to microwave radiation in vitro.

Human whole-blood samples were exposed to continuous microwave radiation, frequency 7.7 GHz, power d...

In all experimental conditions, the frequency of all types of chromosomal aberrations was significan...

The results of the study indicate that microwave radiation causes changes in the genome of somatic human cells and that the applied tests are equally sensitive for the detection of the genotoxicity of microwaves.

Cite This Study
Garaj-Vrhovac V, Fucic A, Horvat D, (1992). The correlation between the frequency of micronuclei and specific chromosome aberrations in human lymphocytes exposed to microwave radiation in vitro. Mutat Res 281(3):181-186, 1992.
Show BibTeX
@article{v_1992_the_correlation_between_the_996,
  author = {Garaj-Vrhovac V and Fucic A and Horvat D and},
  title = {The correlation between the frequency of micronuclei and specific chromosome aberrations in human lymphocytes exposed to microwave radiation in vitro.},
  year = {1992},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/1371840/},
}
PubMed: 1371840

Cited By (156 papers)

View all 156 citing papers on Semantic Scholar

Quick Questions About This Study

Yes, a 1992 study found that 7.7 GHz microwave radiation significantly increased chromosome breaks and abnormalities in human white blood cells. Researchers observed dicentric chromosomes (with two centers) and ring chromosomes, demonstrating that radar-frequency radiation directly damages human DNA even at relatively low power levels.
Micronuclei are fragments of damaged DNA that form when chromosomes break during cell division. The 1992 Garaj-Vrhovac study found that 7.7 GHz microwave radiation significantly increased micronuclei formation in human lymphocytes, indicating direct genetic damage from radar-frequency electromagnetic fields.
Yes, exposure to 7.7 GHz microwave radiation caused dicentric chromosomes in human lymphocytes according to 1992 research. Dicentric chromosomes have two centers instead of one, representing severe chromosomal damage. The study found these abnormalities only appeared in radiation-exposed samples, not control samples.
The 1992 study showed micronucleus tests are equally sensitive as chromosome aberration tests for detecting genetic damage from 7.7 GHz microwaves. Researchers found a positive correlation between micronuclei frequency and specific chromosomal aberrations, making both tests reliable indicators of microwave-induced DNA damage.
Yes, 7.7 GHz radar frequency radiation damages human DNA in vitro according to 1992 research. The study exposed human blood samples to microwave radiation and found significant increases in all types of chromosomal aberrations compared to unexposed controls, proving direct genetic damage occurs.