Advanced theoretical methods can accurately calculate various atomic observables and predict electronic structure. Still, systematic computations of the radiative and non-radiative transition probabilities and energies are missing for the actinides and all the transfermium elements. However, these compilations are needed for comprehensive Monte-Carlo simulations (such as Geant4) of the radioactive decay of transfermium nuclei. These simulations can form a basis for data analysis of experiments, especially with complex detection setups. Investigation of the transfermium nuclei is crucial for understanding the nature of the nuclear force. In this study, simulations based on data from the Jena Atomic Calculator (JAC) and the data from the Evaluated Atomic Data Library (EADL) present in Geant4 were found compatible for the three elements Ba($Z=56$), U($Z=92$), and Fm($Z=100$), thus, validating the JAC calculations. For $Z>100$, we also found sound agreement between simulations that used data generated with JAC and experimental results involving No($Z=102$) and Rf($Z=104$) isotopes. These results demonstrate that JAC can produce reliable atomic data sets for transfermium elements, which will assist in analyzing nuclear-decay-spectroscopy experiments.