Abstract: Research on textbooks has been relevant, among other aspects, as it provides insights into their use and functioning in school teaching situations. Currently, textbooks for Basic Education consist of various types of texts from different sources, including those considered as scientific dissemination texts. Drawing on theoretical and methodological assumptions from Fleck's theory of knowledge (2010), our aim is to understand and discuss how the entry and allocation of scientific dissemination texts in chemistry textbooks, in their textual and epistemological dimensions, work, contribute, modify, and/or add to the concept of radioactivity as a scientific fact. As the main result, we point out that, most of the time, these entries and allocations acted as intracollective traffics concerning the scientific fact of radioactivity. This occurred through the association of this fact with other scientific and/or social facts, which were explicit in the scientific dissemination text or through the mediation of these texts in exercises and/or questions. Implications for science education, particularly regarding reading mediations in teaching, are discussed based on the results. ; La investigación sobre libros de texto ha sido relevante, entre otros aspectos, ya que proporcionan subsidios para su uso y funcionamiento en situaciones de enseñanza escolar. Actualmente, los libros didácticos para la Educación Básica están compuestos por varios tipos de textos, de diferentes fuentes, entre ellos, aquellos considerados como textos de divulgación científica. Tomando como supuestos teórico-metodológicos aspectos de la teoría del conocimiento de Fleck (2010), Queríamos entender y discutir cómo la entrada y asignación de textos de divulgación científica en libros de texto de Química, en sus dimensiones textual y epistemológica, trabajan, contribuyen, modifican y/o añaden al concepto de radiactividad como un hecho científico. Como principal resultado, señalamos que, en la mayoría de las veces, esas entradas y asignaciones actuaron ...
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