Bernardes, T.L. da S., Amadeu, R.A., Santos, R.S., Garcia, R.H.L., Velo, A.F., Cavallaro, F.A., Mesquita, C.H. and Hamada, M.M. 2021. Study of the petrology of the shale rock from the Parana basin. Brazilian Journal of Radiation Sciences. 9, 1A (Apr. 2021). DOI:https://doi.org/10.15392/bjrs.v9i1A.1467.