This paper aims to introduce the initiative "Escola Sirius para Professores do Ensino Médio" (ESPEM, Sirius School for High School Teachers) hosted by the "Centro Nacional de Pesquisa em Energia e Materiais" (CNPEM, Brazilian Center for Research in Energy and Materials) and supported by the Sociedade Brasileira de Física (SBF, Brazilian Physical Society). The program covers the principles and applications of synchrotron radiation with expositive lectures, discussions, and visits to the CNPEM facilities. By using semi structured interviews, a remote focal group and surveys to find out the impact of ESPEM, we observed that the teachers shared their experience and disseminate the acquired knowledge with their peers and students.