To carefully address the above mentioned issues (related to traceability of eye lens dosimetry measurements), a metrological method based on using modern 3D printing techniques to create high-precision human head dosimetry is proposed. Basically, as the first step, a precise replica of the human head, including the human eye will be created. Special attention will be accorded to the 3D eyeball, which will have the same geometry and the same composition as the real eye. Inside the eyeball, at the specific place of the eye lens, a passive dosimeter will be placed (Solid-State Dosimetry: optically stimulated luminescent dosimetry (OSLD)). A commercially available standard eye lens dosimeter will be attached to the phantom. The entire head will be exposed to specific ionizing radiation doses, and after that, the registered dose values will be read. In parallel, two Monte Carlo platforms will be used (GEANT4 - “GEometry ANd Tracking” and MCNP - “Monte Carlo N-Particle”) to simulate the exact condition of the exposure. In the end, the results obtained by the experimental method will be compared to the ones obtained computationally. Taking into account all the involved parameters, the associated uncertainty of the results will be carefully addressed and provided. The second part of the experiment will be related to determining the uniformity of the ionizing radiation field, meaning that a special pair of glasses will be worn by the head phantom, having passive detectors as lens (ionizing radiation-induced absorbance (RIA)). After gradually reading the dose values along to the radiosensitive parts of the glasses, the uniformity of the radiation field will be determined. This field uniformity will be double-checked as well by using the Monte Carlo method. It is essential to study the dose field uniformity in order to determine the dependence of the dose value taken by the eye lens to the position (ionizing radiation source - exposed eye). The final step of the experiment will be providing traceable, reliable and precise calibration factors (with the associated uncertainties) for the commercially available dosimeter used.

By completing all these steps, the main result of the project will be a method for assuring the national metrological traceability chain related to the dosimetry of the eye lens. In this way, the practical implementation of the provisions of the Council Directive 2013/59/EURATOM will be strongly supported.

This work was supported by a grant of the Romanian Ministry of Education and Research, CNCS - UEFISCDI, project number PN-III-P1_1.1-TE-2019-0217, within PNCDI III

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