Unknown authors · 1987
During the week of September 22, 1986, EPA and FCC personnel investigated radiofrequency radiation intensities near the Lookout Mountain antenna farms west of Denver, Colorado. Typical power densities near several area residences did not exceed 100 pW/cm², and the highest value along Cedar Lake Road was 580 pW/cm², which is below the 1000 pW/cm² FCC guideline. Near the base of the KYGO-FM tower, a 10,000 pW/cm² value was found and power densities exceeding 1,000 pW/cm² were measured over a large area in a residential area accessible to the public. EPA urged the FCC to order KYGO to correct the problem as soon as possible.
Kolmodin-Hedman B et al. · 1987
P. P. Lele et al. · 1987
Louis N. Heynick · 1987
Bernhard E. Keiser, A.K. Guthrie · 1987
Unknown authors · 1987
Researchers exposed chick embryos to sinusoidally oscillating 50 Hz magnetic fields during their first two days of development. In the first series, abnormal embryo percentages were 16% in controls, 16% at 0.1 A/m, 14% at 0.3 A/m, 29% at 1 A/m, and 32% at 10 A/m. In the second series, abnormal embryo percentages were 17% in controls, 10% at 0.4 A/m, 19% at 0.6 A/m, 17% at 0.9 A/m, and 36% at 1.35 A/m. Only the 1.35 A/m group was significantly different from controls in the second series. The results suggest that exposure causes abnormal development and that no abnormalities are induced below a threshold between 0.9 and 1 A/m.
Unknown authors · 1987
Purified plasmid DNA was exposed to microwave radiation at nonthermal levels in the frequency range from 2.00 to 8.75 GHz. The exposure produced single- and double-strand breaks detected by agarose gel electrophoresis. Microwave-induced DNA damage depended on the presence of small amounts of copper. The effect was dependent on both microwave power and exposure duration. Cuprous ions, but not cupric ions, mimicked the microwave effects on DNA.
Chang-Zern Hong, David Harmon, Jen Yu · 1986
Nerve conduction showed no significant change in distal latencies or compound muscle action potential amplitudes at field densities up to 1.2 tesla for 60 seconds. Nerve excitability, measured as submaximally evoked compound muscle action potential amplitude changes, increased significantly when the nerve was exposed to fields stronger than 0.5 tesla for longer than 30 seconds. The excitability increase disappeared one minute after the magnetic field exposure ended.
Unknown authors · 1986
The EPA proposed four alternative approaches to limit public exposure to radiofrequency radiation. Three options are regulatory and would set whole-body average SAR limits of 0.04, 0.08, and 0.4 W/kg for frequencies above 3 MHz. For frequencies below 3 MHz, the regulatory options would limit electric field intensity to 87, 275, and 614 V/m and magnetic field intensity to 0.23, 0.73, and -1.63 A/m respectively. The fourth option is nonregulatory and would use information and technical assistance programs instead of adopting Federal Guidance.
M. Granger Morgan · 1986
Government agencies invested heavily in research examining whether 60-hertz electromagnetic fields from power lines pose health risks. The research demonstrated that low-frequency fields can produce changes in living systems under specific circumstances but has not demonstrated that a hazard exists. Laboratory animal screening studies largely failed to find adverse health impacts, and epidemiological studies linking long-term exposure to cancers were inconclusive. The scientific evidence neither clearly indicates a significant risk nor clearly indicates little or no risk from 60-hertz field exposures.
Richard D. Phillips · 1986
Michael Kachmar · 1986
Chung-Kwang Chou, John A. McDougall, Arthur W. Guy · 1986
Researchers measured the shielding effectiveness of a microwave protective suit by testing fabric attenuation in waveguides and by measuring electric field reduction at ten locations on a phantom man model exposed to 915 MHz and 2450 MHz radiation. When worn on the phantom, the suit provided at least 20 dB attenuation at 915 MHz at the head and torso and at least 25 dB at 2450 MHz at all ten measured locations. Washing the fabric reduced its attenuation: ten home or industrial washes caused a 3 to 5 dB drop for the warp direction, and 25 industrial washes decreased attenuation by about 6 dB for both warp and fill directions.
Martino Grandolfo · 1986
Donald M. Witters, Daniel H. Schaubert, Mary K. Barrick · 1986
Unknown authors · 1986
The article was published in Int J Radiat Biol Relat Stud Phys Chem Med in July 1986. The authors are Sagripanti JL and Swicord ML. The title indicates DNA structural changes caused by microwave radiation.
Unknown authors · 1986
David H. Sliney · 1985
ACGIH stated in 1980 that insufficient knowledge existed to set guidelines for magnetic field exposures. Existing laboratory guidelines had little basis beyond being levels considered safe in the 1960s.
Robert F. Cleveland · 1985
Unknown authors · 1985
Jonathan M. Charry, William H. Bailey, T. Dan Bracken · 1985
Daniel G. Jablonski · 1985
John C. Monahan, John A. D'Andrea · 1985
Unknown authors · 1985
G. Johnson et al. · 1985
