Combining 3D printing with OSL dosimeters for extremity monitoring according to ICRU 95 operational quantity.

The International Commission on Radiation Units and Measurements (ICRU) has recently proposed on its Report 95 a new set of operational quantities for personal and area monitoring. The definition of such quantities is then greatly simplified by adopting the same phantoms already in use to calculate Protection quantities. However, the existing conversion coefficients between these kerma and the operational quantities changes, causing current personal dosimeters to be directly affected as well. Therefore, it is needed for dosimeters to evolve in order to handle changes in their energy dependence response, which often requires re-evaluations or even re-designing holders from sketch. In this scenario, the present paper aims to demonstrate the viability of combining 3D printing through stereolithography (SLA) technique with optically stimulated (OSL) technology of beryllium-oxide (BeO) commercial crystals in manufacturing a dosimeter holder to be used in wrist-type dosimeters for photons. Such dosimeter holder must be able to fulfil the current international criteria even for the new operational quantity proposed by ICRU 95. After being created and properly calibrated, the holder underwent energetic and angular assessment tests. The results showed that the badge performed within a relative response range of approximately ±20%. These tests were conducted within an energy range of 23-662 keV and angles ranging from 0°to 60°, as outlined in IEC 62387:2020. The dosimeter demonstrated a satisfactory performance under the specified conditions set by the IEC standard.