Accession Number : AD0777144

Title :   Ocular Damage Thresholds for Repetitive Pulsed Argon Laser Exposure.

Descriptive Note : Interim rept. Sep 72-Sep 73,

Corporate Author : SCHOOL OF AEROSPACE MEDICINE BROOKS AFB TEX

Personal Author(s) : Gibbons,William D. ; Egbert,David E.

Report Date : FEB 1974

Pagination or Media Count : 20

Abstract : The maculae of rhesus monkeys were exposed to radiation from an argon-ion laser operated at a wavelength of 514.5 nm in the TEMoo mode. Damage thresholds were determined for exposure to a single 40 microsec pulse and for different pulse train lengths and repetition rates of 40 microsec wide repetitive pulses. The single pulse threshold was determined to be 2.0 micro J. Thresholds for repetition rates of 100 and 1000 Hz at a pulse train length of 0.5 sec were both found to be 1.0 micro J per pulse. Exposures made at a repetition rate of 100 Hz for pulse train durations of 0.1 and 1.0 sec yielded thresholds of 2.0 and 0.4 micro J per pulse. These data indicate that pulse train length has a greater effect on threshold than repetition rate for the range of parameters studied. (Author)

Descriptors :   *Gas lasers, *Eye, *Radiation effects, Experimental data, Exposure(Physiology), Damage, Monkeys, Laboratory animals, Pulses, Health physics, Radiobiology, Thresholds(Physiology), Radiation dosage, Dose rate

Subject Categories : Radiobiology
      Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE