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MEASURING THE RADIOFREQUENCY FIELD STRENGTH OF IMPLANTED TRANSMITTERS.
Final rept. Sept 66-Feb 67,
SCHOOL OF AEROSPACE MEDICINE BROOKS AFB TEX
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Radiofrequency RF signal strength measurements were made of small VHF transmitters in free-space and after abdominal implantation in rhesus monkeys. This was done to determine the extent to which RF energy is absorbed by the body tissue. All measurements were made in the 84 to 106 MHz frequency range using both horizontally and vertically polarized receiving antennas. Sixteen implants were evaluated in twelve animals. Data are presented in polar coordinate form giving distribution patterns of radiation field strength before and after implantation. Most of the transmitters showed only signal attenuation after implantation and no modification of field pattern. This indicated body tissue is transparent to 84 to 106 MHz electromagnetic energy. Author
APPROVED FOR PUBLIC RELEASE