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Health hazard evaluation report: HETA-91-070-2194, Library of Congress, Washington, D.C.
Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health, HETA 91-070-2194, 1992 Mar; :1-25
In response to a request from the Library of Congress (SIC-8231), Washington, D.C., an evaluation was undertaken of possible exposure to electromagnetic radiation emitted by video display terminals (VDT) at the Madison Building. Measurements were taken in the Madison building on April 3 and July 8, 1991 at four worksites. The maximum x-ray radiation level range measured at the screen face was 2 to 6 counts per minute (cpm) and the maximum background activity measured in the outside hall was 3cpm. For comparison, a reading of 4000cpm is roughly equivalent to the maximum exposure level suggested for television receivers. Very low frequency (VLF) readings for electric and magnetic field strength levels at the facial position of the operators ranged from 1.1 to 7.0 volts per meter and 10 to 170 milliamperes per meter, respectively. The maximum induced currents from any of the four terminals as measured with hands on the keyboards, finger touching the screen, and with the hand placed flat on the screen were 0.0008, 0.0038, and 0.0463 milliamperes, respectively. The authors conclude that the electromagnetic radiation exposures as measured at any of these terminals was not of a level expected to cause adverse health effects.
NIOSH-Author; NIOSH-Health-Hazard-Evaluation; NIOSH-Technical-Assistance-Report; HETA-91-070-2194; Hazard-Unconfirmed; Region-3; Computer-equipment; Keyboard-operators; Radiation-exposure; Electromagnetic-radiation; Radiation-hazards; Video-display-terminals; Nonionizing-radiation;
Field Studies; Hazard Evaluation and Technical Assistance
NTIS Accession No.
National Institute for Occupational Safety and Health
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division