Geant4 calculations for space radiation shielding material Al2O3Veli Capali, Tolga Acar Yesil, Gokhan Kaya, Abdullah Kaplan, Mustafa Yavuz and Tahir TilkiEPJ Web of Conferences, 100 (2015) 02002DOI: https://doi.org/10.1051/epjconf/201510002002