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Computer screens and brain cancer

A W Wood1

  • 1School of Biophysical Sciences and Electrical Engineering, Swinburne University of Technology, Hawthorn, Victoria, Australia.

Australasian Physical & Engineering Sciences in Medicine
|December 1, 1995
PubMed
Summary

Computer screen magnetic fields may induce electrical currents in the brain, but current evidence does not show a clear link to increased brain tumor rates. Further research is needed.

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Area of Science:

  • Biophysics
  • Occupational Health
  • Epidemiology

Background:

  • Public and governmental concern exists in Australia regarding potential links between computer use and brain tumors.
  • Screen emissions, specifically magnetic fields from scanning, are suspected sources of hazard.
  • These fields can induce electrical currents in exposed biological tissues.

Purpose of the Study:

  • To estimate the induced current densities in the brain from computer screen magnetic fields.
  • To compare these levels with those from other electrical appliances.
  • To review epidemiological data on brain tumor incidence in relation to computer use and similar technologies.

Main Methods:

  • Estimation of induced current densities in the brain based on magnetic field emissions from computer screens (specifically vertical flyback).
  • Review and analysis of existing epidemiological literature on brain tumor incidence.
  • Comparison of estimated induced current densities with established safety guidelines or levels from other sources.

Main Results:

  • Estimated induced current densities in the brain can reach up to 1 mA/m2, primarily due to vertical flyback.
  • These induced current densities are comparable to or higher than those from many other electrical appliances.
  • Epidemiological data currently show no definitive increase in brain tumor incidence directly attributable to widespread computer use, though the phenomenon is relatively recent.

Conclusions:

  • While computer screens generate magnetic fields that induce electrical currents in the brain, the direct link to increased brain tumor risk remains unproven.
  • Existing epidemiological studies on related technologies (e.g., TV repair) have limitations as indicators of computer screen risk.
  • Further long-term epidemiological studies are warranted to definitively assess the potential health risks associated with prolonged computer use.

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