M.S. Thesis Presentation by Bryon Michael Murray
Monday, May 7, 2001

(Dr. Nolan Hertel, advisor)

"Determination of Eye Dose From Personnel Monitoring Devices in Medical Institutions"

Abstract

The determination of effective dose to the eye for occupationally exposed individuals with primary duties in the medical care environment is addressed.  These individuals are typically monitored for radiation exposure with a single monitoring device worn at the collar level and it is therefore necessary to examine the relation of this reported dose to the dose received at the eye level.

Several considerations are necessary when reporting eye dose in this fashion including energy of the scattered radiation beam, specific location of the personnel monitor, geometrical position of the monitor in relation to the source of exposure, effect of ancillary shielding devices and position of the occupationally exposed individual.  These factors were simulated for this paper by producing scattered radiation from diagnostic x-ray beams generated at tube potentials in the range of 80 to 120 kVp using a simulated patient phantom.  Simulated monitoring conditions were accomplished by positioning an Aldersson phantom in close proximity to the scattering phantom and placing thermoluminescent dosimeters at the collar and eye level.  Measurements were taken with and without protective lead aprons.

The results indicate that the dose measured at the collar level is a fair approximation of the dose received at the eye level when a lead protective apron is worn.  Without lead protective apparel, the measured dose at the collar level is appreciably higher than that measured at the eye level.