Accession Number : ADA302963

Title :   Millimeter Wave Ocular Research.

Descriptive Note : Final rept. 1 Jan 86-30 Dec 88,

Corporate Author : UNIVERSITY OF WESTERN ONTARIO LONDON

Personal Author(s) : Trevitchick, John R.

PDF Url : ADA302963

Report Date : 30 SEP 1995

Pagination or Media Count : 52

Abstract : Techniques were developed for irradiation of rabbit eyes with 35 GHz millimeter waves to determine cellular damage mechanism and thresholds. The irradiation was performed using anaesthetized 2.5 kg New Zealand white rabbits exposed to 35 GHz pulsed and continuous wave (OW) irradiation delivered by a special focusing antenna to a spot approximately 1.3 crn diameter in which the rabbit eye was placed. The peak specific absorption rate (SAR) (1 .% mW/g per I mW/Cm2 of incident power) was determined with the aid of a thermographic camera which gave a map of the local corneal surface temperatures; the SAR assumed thE values of thermal conductivity and specific heat for water since the cornea contains so much water. The damage observed has been divided into four categories which are progressively increased, by SEM and LM evaluations. The unirradiated left cornea appears to serve as a? appropriate control. This damage appears to increase (1) as the irradiation is modulated b'j pulsing at the same power. (2) Damage increases as the same total energy is delivered

Descriptors :   *MILLIMETER WAVES, *IRRADIATION, *RABBITS, *INFRARED BINOCULARS, PEAK VALUES, TEMPERATURE, DAMAGE, WATER, CELLS, THRESHOLD EFFECTS, RATES, SHORT RANGE(TIME), PULSES, THERMAL CONDUCTIVITY, ANTENNAS, CAMERAS, SAFETY, FOCUSING, EYE, VALUE, ABSORPTION, SURFACE TEMPERATURE, DOSE RATE, SPECIFIC HEAT, THERMOGRAPHY, CORNEA.

Subject Categories : Anatomy and Physiology
      Radiobiology
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE