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[en] In Romania heavy water is produced by H2O-H2S chemical exchange (GS process) and by water distillation, in two lines working simultaneously. The distillation plants have high separation capacity, a distillation line being able to concentrate water from two GS lines. The paper presents data regarding possibilities to use one distillation line for oxygen - 18 production, as pre-concentrates or finite products. A simulation program was used to calculate the oxygen - 18 concentration in the heavy water produced, maximum 18 O concentration of pre-concentrate obtained on distillation line and the separation cascade sizes to obtain 95% 18 O, with first and second stage having the same sizes like the distillation plant from the Romanian heavy water factory. Oxygen-18 separation factor is much lower than deuterium separation factor. For this reason, oxygen-18 is a very expensive product. (authors)
Source
Stefanescu, Ioan (ed.) (National Institute of Research-Development for Cryogenics and Isotopic Technologies, ICSI, PO Box 10, Str. Uzinei nr. 4, RO-1000 Rm. Valcea (Romania)); National Institute of Research-Development for Cryogenics and Isotopic Technologies, ICSI, PO Box 10, Str. Uzinei nr. 4, RO-1000 Rm. Valcea (Romania). Funding organisation: Ministry of Education and Research, Bucharest (Romania); 253 p; ISSN 1582-2575; 
; 2004; p. 245; 10. ICSI conference 'Progress in Cryogenics and Isotope Separation'; Caciulata (Romania); 14-15 Oct 2004; Available from author(s) or National Institute of Research-Development for Cryogenics and Isotopic Technologies, ICSI, PO Box 10, Str. Uzinei nr. 4, RO-1000 Rm. Valcea (RO); Available from National Institute of Research-Development for Cryogenics and Isotopic Technologies, ICSI, PO Box 10, Str. Uzinei nr. 4, RO-1000 Rm. Valcea (RO); Short communication
; 2004; p. 245; 10. ICSI conference 'Progress in Cryogenics and Isotope Separation'; Caciulata (Romania); 14-15 Oct 2004; Available from author(s) or National Institute of Research-Development for Cryogenics and Isotopic Technologies, ICSI, PO Box 10, Str. Uzinei nr. 4, RO-1000 Rm. Valcea (RO); Available from National Institute of Research-Development for Cryogenics and Isotopic Technologies, ICSI, PO Box 10, Str. Uzinei nr. 4, RO-1000 Rm. Valcea (RO); Short communication