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[en] Standardization of exp.56 Co had been carried out using 4 pi beta-gamma coincidence methods. The radionuclide use for calibration of nuclear instruments on range of energy over 1500 keV. The exp.56 Co had been produced by irradiation of proton by using a cyclotron with 15 MeV of energy and 300 mb of cross-section to natural iron target (99,5% of purity) at the Institute for Nuclear Study, University of Tokyo. Source preparation had been done by gravimetry method after the irradiated source was dissolved in 8N HCI solution. The disintegration rate had been measured using 4 pi beta-gamma coincidence apparatus, where the gamm gets sets on 511 and 847 keV gamma-rays. The result measurement is fairly good with the specific activity is 3078 n 15 Bq/mg
Source
Fathony, M.; Hiswara, Eri (National Nuclear Energy Agency, Serpong (Indonesia)) (eds.); Centre for Research and Development of Radiation Safety and Nuclear Biomedicine, National Nuclear Energy Agency, Serpong (Indonesia); 269 p; ISSN 0854-4085; 
; Sep 2000; p. 176-182; 8. Scientific Presentation: Environment and Radiation Safety; Presentasi Ilmiah Keselamatan Radiasi Dan Lingkungan VIII; Jakarta (Indonesia); 23-24 Aug 2000; Also available from from Center for Development of Informatics and Computation Technology, National Nuclear Energy Agency, Puspiptek Area, Fax. 62-21-7560923, PO BOX 4274, Jakarta (ID); 5 refs.; 2 tabs.; 3 figs.
; Sep 2000; p. 176-182; 8. Scientific Presentation: Environment and Radiation Safety; Presentasi Ilmiah Keselamatan Radiasi Dan Lingkungan VIII; Jakarta (Indonesia); 23-24 Aug 2000; Also available from from Center for Development of Informatics and Computation Technology, National Nuclear Energy Agency, Puspiptek Area, Fax. 62-21-7560923, PO BOX 4274, Jakarta (ID); 5 refs.; 2 tabs.; 3 figs.