ENERGY AND ANGULAR DEPENDENCE OF RADIOPHOTOLUMINESCENT GLASS DOSEMETERS FOR EYE LENS DOSIMETRY.

Area of Science:

• Medical Physics
• Radiation Dosimetry
• Occupational Health

Background:

• Recent research indicates lens opacities form at lower radiation doses than previously thought.
• The International Commission of Radiological Protection (ICRP) revised eye lens dose limits in 2011, reducing the annual limit from 150 mSv to 20 mSv.
• This necessitates accurate monitoring of eye lens radiation doses.

Purpose of the Study:

• To characterize radiophotoluminescent glass dosemeters (GD-300 series) for eye lens dose monitoring.
• To evaluate their energy and angular dependence for radiation protection applications.

Main Methods:

• Characterization of GD-300 series dosemeters using ISO 4037 X-ray narrow spectra (S-Cs, S-Co) and specific energies (N-60 to N-250).
• Testing performed on ORAMED cylindrical and ISO water slab phantoms at SCK•CEN, Belgium, and Ruđer Bošković Institute, Croatia.
• Evaluation of angular dependence from 0 to 90 degrees for vertical and horizontal placements.

Main Results:

• GD-300 series dosemeters demonstrated good energy dependence relative to S-Cs on the cylindrical phantom.
• Minimal angular dependence was observed up to 45 degrees, irrespective of dosemeter orientation.
• Some angular dependence emerged at higher angles, particularly with low-energy photons (N-60).

Conclusions:

• GD-300 series glass dosemeters exhibit suitable properties for monitoring personal dose equivalent, Hp(3).
• The dosemeters show promise for implementing the updated, lower eye lens dose limits.
• Minor improvements may enhance performance, especially at higher angles and lower energies.