CDR William C. Milroy, MC, USN · 1974
The one-day symposium was held on 10 July 1973 at the Naval Weapons Laboratory in Dahlgren, Virginia. The symposium marked the opening and dedication of a new Biomedical Research Laboratory and the start of a multidisciplinary research effort on nonionizing radiation bioeffects. Six invited papers covered bio-engineering, comparative biology, human exposure factors, high power pulses, and EMP bioeffects. The proceedings were published because of a large number of requests for reprints of the presented papers.
Gary H. Price · 1974
The review classifies nuclear electromagnetic pulse generation into three models: Compton electron currents from prompt gamma radiation, photoelectron currents from primary X radiation, and field displacement from expanding plasma perturbing the geomagnetic field. For each model the review discusses causes of asymmetry in the current system necessary for radiation, including the earth-atmosphere interface, atmospheric density gradient, geomagnetic field anisotropy, nonuniform radiation emission, and device case asymmetries. Available experimental data establish the models as probably correct in identifying principal generation processes but are inadequate for quantitative assessment of model accuracy.
Freeman W. Cope · 1974
The author first built a large copper cavity that absorbed over 95 percent of incident S-band power when empty, making it impractical for rat exposures. Incident powers up to 10 watts were used at 3.25 Gc for S-band and 9.00 Gc for X-band.
Gandhi OP · 1974
Researchers used a parallel-plate waveguide to measure RF absorption in rats and phantom bodies across 285 to 4000 MHz. The waveguide results agreed well with free-space irradiation measurements. The El4 orientation (electric field along the major length) was the most absorbing, while the A14 orientation was the least absorbing, and the k14 orientation was only slightly more absorbing than A14. In rats, peak absorption frequencies decreased with increasing body weight, with maximum absorption at 1217, 1020, 900, and 760 MHz for 96-, 158-, 261-, and 390-g animals respectively. Waveguide absorption measurements were in quantitative agreement with behavioral experiments showing shorter work-stoppage times at frequencies with higher absorption.
K. J. McLean et al. · 1974
Om P. Gandhi · 1974
John S. Steinhart, Carol E. Steinhart · 1974
Unknown authors · 1974
Louise B. Young, H. Peyton Young · 1974
Lawrence E. Larsen, Robert Avery Moore, John Acevedo · 1974
Bench tests of conventional temperature transducers in microwave fields showed artifacts of several degrees centigrade. In waveguide tests, the conventional glass electrode produced a fast artifact of approximately 11/2°C at 19.5 mm penetration, while the MIC electrode with 5-μm microline showed about 0.1°C artifact. Thermographic testing revealed the MIC electrode itself was undetectable, but metallic lead wires heated to approximately 10°C above the mount during 2-minute exposures at 50 mW/cm² and conducted heat to the upper substrate.
A. W. GUY, J. F. LEHMANN, J. B. STONEBRIDGE · 1974
Arthur W. Guy, James C. Lin, C.K. Chou · 1974
Researchers conducted in vivo and in vitro studies of nervous tissues exposed to microwave radiation. Continuous-wave microwaves affected conduction and transmission latencies and amplitudes of evoked potentials in the central nervous system of anesthetized cats, isolated cat nerves, and rabbit ganglia similarly to localized conduction heat. Temperature rises were always associated with any observable changes in the nervous tissues exposed to continuous-wave irradiation. The threshold for latency changes occurred between 2.5 and 5.0 W/kg of absorbed power density, about one-quarter to one-half of the normal metabolic rate of brain tissue.
Maurice J. Oringer · 1974
LT T. Moslak, USNR-R · 1974
Joan Arehart-Treichel · 1974
A.Portela et al. · 1974
L. T. Rutledge, C. Wright, J. Duncan · 1974
Rein, R. · 1974
Unknown authors · 1974
Researchers broke two legs in each of 43 dogs and applied a pulsing electromagnetic field to one leg for 28 days while the other leg served as a control. The fractures exposed to the field healed better than the unexposed fractures.
Bassett, Pawluk, Pilla · 1974
Researchers used pulsing electromagnetic fields inductively coupled across skin to study bone repair in adult beagles that had undergone bilateral fibular osteotomies. In the second series, of the 13 dogs analyzed, 10 demonstrated higher load values in the treated legs, a result significant by the sign test at P <.07. In the first series, with a circuit repeating at 1 hz, the mean load values revealed no statistically significant difference between stimulated legs and their controls.
H. H. Seliger et al. · 1974
The transients were confirmed to be thermal in origin by temperature dependence. Similar transients were observed in biological tissues. At human hearing threshold, the transients produce about 90 db in the audible band, above the expected bone-conduction threshold.
Unknown authors · 1974
Many investigations suffer from inadequacies of either technical facilities and energy measurement skills or insufficient control of the biological specimens and the criteria for biological change. A large body of dependable data on the biologic effects of microwave exposure has been accumulated without any incontrovertible evidence of subtle, longterm, or cumulative effects. The apparent differences in U.S. and Eastern European standards are based not on actual factual information but on differences in basic philosophy. These differences appear in the areas of industrial hygiene, basic scientific research, and reporting of scientific data.
Vetter R J, Ziemer P L, Puntenney D · 1974
Livesay DE, Chen KM · 1974
Arthur W. Guy, James C. Lin, Piro Kramar, Ashley F. Emery · 1974
