Suyanto DA, Oktaviana AT, Syväjärvi M, Sardjono Y, Wijaya GS, Triatmoko IM. Shielding innovation for health security: A PHITS-based optimization of Portland material for proton therapy. App.Sci.Def. 2025;3(2):103-116. doi:10.58524/app.sci.def.v3i2.841