Arif, Idam, Siti Khotimah, Octolia Tambunan, and Poppy Tjahaja. 2016. “Study on Annual Internal Radiation Dose from Consumption of Sweet Potatoes Contaminated by 134 Cs”. Indonesian Journal of Physics 21 (1), 19-22. https://doi.org/10.5614/itb.ijp.2010.21.1.4.