Spectral Comparison of Neutron-Irradiated Natural and Enriched Ytterbium Targets for Lu-177 Production - Maiyesni, M.; Center of Radioisotopes and Radiopharmaceuticals Technology, National Nuclear Energy Agency, Puspiptek Area Serpong, Tangerang Selatan 15310, Indonesia (PPIKSN-BATAN, 2019)