%0 Journal Article %T A theoretical evaluation on radiation shielding features of Van-Ercis¸ and Rize-İkizdere (Türkiye) obsidians by using Phy-X/PSD code %A AYGUN, Z. %A AYGUN, M. %J Sigma Journal of Engineering and Natural Sciences %D 2022 %V 40 %P 845-854 %R 10.14744/sigma.2022.00100