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[en] Acid digestion, using the microwave power, was applied for ''dissolution'' of different materials corresponding to the radioactive waste matrices resulted from a nuclear power plant operation, including exchange resin (cationic and mixed), concrete, paper, textile and activated charcoals. A small aliquot of solid sample (0.1-0.5g) was mixed with a known volume of digestion reagents (HNO3 67% - H2O2 30% or HNO3 67% - HCl 37%, with HF addition if the SiO2 was present in matrices) in a 100 ml PTFE vessel and it was mineralized using a Berghof digestion system, Speedwave 4. Starting from the manufacturer procedures, the technical parameters (temperature and mineralization time), the types and quantities of digestion reagents were optimized. After the mineralization process, the samples were transferred in centrifuge tubes, separated at 3500 rot/min and visually analysed. The obtained solutions were clear, without suspended or deposed materials and separated phases, ready for future separation processes of the ''difficult to measure'' radioisotopes. (authors)
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Constantin, Marin; Turcu, Ilie (Institute for Nuclear Research-Pitesti, 1 Campului Str., RO-115400 Mioveni, Arges (Romania)) (eds.); Institute for Nuclear Research-Pitesti, 1 Campului Str., RO-115400 Mioveni, Arges (Romania); University of Pitesti, Bd. Republicii, 71, Pitesti (Romania). Funding organisation: National Authority for Scientific Research, Bucharest (Romania); 74 p; ISSN 2066-2955; 
; 2015; p. 69-74; NUCLEAR 2015: 8. annual international conference on sustainable development through nuclear research and education; Pitesti (Romania); 27-29 May 2015; Also available from Institute for Nuclear Research-Pitesti, 1 Campului Str., RO-115400 Mioveni, Arges (RO); University of Pitesti, Bd. Republicii, 71, Pitesti (RO); 5 refs., 3 figs., 3 tabs.
; 2015; p. 69-74; NUCLEAR 2015: 8. annual international conference on sustainable development through nuclear research and education; Pitesti (Romania); 27-29 May 2015; Also available from Institute for Nuclear Research-Pitesti, 1 Campului Str., RO-115400 Mioveni, Arges (RO); University of Pitesti, Bd. Republicii, 71, Pitesti (RO); 5 refs., 3 figs., 3 tabs.