Speaker
Description
Background and Objective: Following the ICRP recommendation to lower the occupational eye lens equivalent dose limit to 20 mSv/year, accurate Hp(3) monitoring has become a critical priority. our study evaluates the performance of commercial eye lens dosimeters by comparing national proficiency testing results under two distinct international standards.
Materials and Methods: Ten dosimetry systems encompassing thermoluminescent dosimeter(TLD) and optically stimulated luminescence dosimeter(OSLD) technologies from four major brands (HARSHAW, Panasonic, RADOS, and LANDAUER) were evaluated. Irradiations were performed with a 20-cm diameter water-filled cylindrical phantom at perpendicular incidence, utilizing Cs-137, various X-ray qualities (IH150, N40, N80, NS150, WS110), and a 90Sr/90Y beta source. Performance was assessed using the ANSI/HPS N13.32 statistical tolerance model and the ISO 14146:2024 dynamic trumpet curve model.
Results: The cross-standard validation revealed outstanding performance. In the ANSI-based intercomparison, all four tested categories yielded performance values (mean ± SD) well below the specified tolerance limit (L), specifically 0.13±0.06, 0.18±0.06, 0.15±0.10, and 0.18±0.06. Furthermore, all of those groups successfully passed the ISO 14146:2024 acceptance criteria. The mean response values (mean ± SD) for the four categories were 1.03±0.04, 1.01±0.06, 1.12±0.18, and 1.08±0.13, respectively. Despite fundamental mathematical variations between the evaluation models, the dosimeters demonstrated excellent Hp(3) measurement accuracy.
Conclusion: The findings confirm the technological maturity and robustness of current mainstream eye lens dosimetry systems. Both TLD and OSLD technologies are highly reliable for routine occupational monitoring. This dual-standard validation provides strong evidence that these dosimeters can effectively support institutions in complying with the new dose limits and safeguarding personnel eye lens dose monitoring.