Evaluation of a 3D printed OSL eye lens dosimeter for photon dosimetry

• Published in: Journal of radiological protection Vol. 40; no. 4; pp. 1247 - 1257
• Main Authors: Santos, M F, Filho, W C V, Melo, G T P, Asfora, V K, Khoury, H J, Barros, V S M
• Format: Journal Article
• Language: English
• Published: England IOP Publishing 01.12.2020
• Subjects: 3D printing; beryllium oxide; Lens, Crystalline; optically stimulated dosimetry; Photons; Printing, Three-Dimensional; Radiation Dosimeters; Radiometry; beryllium oxide; 3D printing; optically stimulated dosimetry
• ISSN: 0952-4746; 1361-6498
• DOI: 10.1088/1361-6498/ab97fe

This work demonstrates the use of high-resolution 3D printing to fine-tune the low energy dependence of an eye lens dosimeter holder associated to a BeO OSL detector element (ezClip). Five geometries of the denominated iBe dosimeter were developed, three with a variation in the thickness of the wall in front of the sensitive element that tailor the response at low radiation energies; and three with variations of width and curvature in order to vary the angular response of the dosimeter badges. Additive manufacturing was accomplished using stereolithography which gave a high degree of accuracy and precision. The optimised dosimeter badges showed a low energy and angular dependence, within −20% to +20% in the energy range of 24 keV to 662 keV and from 0 to 60° incidence; and within −10% to +10% in the energy range of 24 keV to 164 keV and from 0 to 60° incidence. In contrast to other dosimeters with higher effective atomic numbers, the use of BeO as the sensitive element resulted in a flat energy and angular dependence response at low energies. A significant reduction in the measurement uncertainty in the diagnostic radiology energy range was achieved.