br Karo, Reh Malem. 2020. “Determination of Radionuclide and Elemental Composition of Agricultural Soils From Sub District Tiga Panah, Karo, North Sumatera, Indonesia by X-Ray Spectrometry ”. PRIMER (Prima Medical Journal) 5 (1). https://doi.org/10.34012/pmj.v3i1.1112.