Thermoluminescent (TLD) and optically stimulated luminescent dosimeters (OSLD) are essential in radiation dosimetry. Such dosimeters can be easily transported due to their small size and can be used in in vivo dosimetry and anthropomorphic simulations. In this work, the dosimetric properties of Li2B4O7 and MgB4O7 compounds were evaluated based on their response to the applied stimulus, whether thermal or optical. The linear dose response range of the luminescent signal, its fading, the lowest detectable dose, and reproducibility are important parameters in determining a good dosimeter for clinical and personal dosimetry. Therefore, the objective of this work was, based on studies performed by other authors on dosimetric characterizations of doped a codoped Li2B4O7 and MgB4O7, to point out those compounds with the greatest potential for applications in personal and clinical dosimetry using TL and OSL techniques. Considering the results described in other works, the materials that stood out for use in personal and clinical dosimetry were Li2B4O7:Cu and MgB4O7:Dy,Na. In several of the reported studies, no data related to LDD, fading and reproducibility of the luminescent signal of the investigated compounds were found. Therefore, there are many possibilities for investigations into these two types of compounds for the purpose of their use in personal and clinical dosimetry. Further studies will provide a broader scientific basis for choosing appropriate dosimetric materials for these applications.
Este trabalho foca no ensino sobre pequenas centrais hidrelétricas como um tema gerador inicial para a abordagem dos conceitos físicos de hidrostática, hidrodinâmica e eletromagnetismo para alunos no ensino médio da rede pública estadual de ensino. Ele foi realizado com turmas do terceiro ano, em duas escolas na cidade de Marabá, no estado do Pará. Foram utilizadas simulações computacionais do Projeto Phet para complementar o entendimento dos conceitos teóricas. Os resultados obtidos evidenciaram que houve melhorias significativas quando comparados aos resultados de um grupo piloto. Houve também a preocupação em fomentar o debate sobre a mudança climática no contexto do problema da utilização das fontes não renováveis de energia e viabilidade de substituição de tais fontes por aquelas que são renováveis.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.