New articles published in 12(3A): II International Symposium on Radiological Protection, Cusco (SIPR, 2023)
Abstract:
The determination of the reference air kerma rate (KR) with well chambers calibrated using a different model of source than desired can lead to significant errors, affecting both radiological traceability institutions and healthcare facilities. This study employs the methodology proposed by SHIPLEY et al. (2015) with the PTW T33005 well chamber model and six models of HDR brachytherapy sources (microSelectron v.1; microSelectron v.2; Flexisource; GammaMed Plus; BEBIG GI192M11; Varisource VS2000) to derive correction factors for source geometry (KSG). These factors adjust the chamber calibration factor for air kerma (NK) to the source model under measurement. The methodology relies on simulating the chamber response to sources using the Monte Carlo Method (MC), specifically utilizing the MCNPX code. Both the source and well chamber models were validated by comparing dosimetric parameters from TG-43 and simulated calibration factors (MCNK) with literature-derived reference values. The normalized KSG values, relative to the microSelectron v.1 source, agree with reference values, demonstrating the methodology's applicability across various chamber models, sources, and MC codes. The corrections ranged from 0.984 to 1.001, with the most significant correction observed for the Varisource VS2000 source, yielding KSG = 0.984, corresponding to a -1.6% correction.
Regulations for the transport of nuclear and radioactive materials in Brazil
Abstract:
The transportation of radioactive material involves a set of procedures as varied as they are complex, justifying its strong standardization. This article aims to demonstrate that the collaborative effort between two Brazilian licensing agencies, which resulted in the elaboration of a Joint Technical Note, was justified considering the legislative process. By consolidating various norms and procedures – from the configurations of packages containing radioactive material to the training program for drivers responsible for transportation, including environmental safety of routes – it proves to be a facilitator of the work for everyone involved in this activity. In conclusion, it is shown that there is strong standardization of this activity in Brazil and that the legislative process is dynamic, reflecting natural improvements in technical and legal aspects inherent to the nature of the material involved.
