Damar Adhiwidya Suyanto, Aditya Tri Oktaviana, Yohannes Sardjono, Gede Sutresna Wijaya, & Isman Mulyadi Triatmoko. (2025). The Simulation of Radiation Shielding Made of Portland Material in a 230 MeV 300 NA Cyclotron Room for Proton Therapy Facility Using PHITS Code System. Jurnal Engine: Energi, Manufaktur, Dan Material, 9(2), 237–248. https://doi.org/10.30588/jeemm.v9i2.2339