Suyanto, D. A., Oktaviana, A. T., Syväjärvi, M., Sardjono, Y., Wijaya, G. S., & Triatmoko, I. M. (2025). Shielding innovation for health security: A PHITS-based optimization of Portland material for proton therapy. International Journal of Applied Mathematics, Sciences, and Technology for National Defense, 3(2), 103-116. https://doi.org/10.58524/app.sci.def.v3i2.841