Firmansyah, Assef Firnando, and Okky Agassy Firmansyah. “Dosimetry Characteristic of Co-60 Calibration Source in SSDL Jakarta Facility After Source Replacement”. Jurnal Ilmiah Aplikasi Isotop dan Radiasi 17, no. 2 (December 31, 2021): 69 – 77. Accessed December 7, 2025. https://ejournal.brin.go.id/jair/article/view/7296.