Accession Number:

AD0670516

Title:

MEASURING THE RADIOFREQUENCY FIELD STRENGTH OF IMPLANTED TRANSMITTERS.

Descriptive Note:

Final rept. Sept 66-Feb 67,

Corporate Author:

SCHOOL OF AEROSPACE MEDICINE BROOKS AFB TEX

Personal Author(s):

• Buchanan,Henry
• Phillips,Jere M.
• Moore,Willis F.
• Richter,Calvin R.

Report Date:

1968-03-01

Pagination or Media Count:

15.0

Abstract:

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

Descriptors:

• *SURGICAL IMPLANTATION
• RADIOFREQUENCY
• MEDICAL EQUIPMENT
• MONITORS
• VERY HIGH FREQUENCY
• TISSUES(BIOLOGY)
• BIOLOGICAL ABSORPTION
• ATTENUATION

Subject Categories:

• Medical Facilities, Equipment and Supplies
• Biomedical Instrumentation and Bioengineering
• Telemetry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE