Arif, I., Khotimah, S., Tambunan, O., & Tjahaja, P. (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