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AbstractAbstract
[en] The isotopic enrichment of tritium in the liquid-liquid extraction system, butylammonium/crownether was investigated using water solution of butylammonium iodide and chloroform solution of dicyclohexyl-18-crown-6. Tritium was enriched in the ammonium-crown complex which was extracted into the organic phase. Both the enthalpy and entropy changes were positive for the direction of negative free energy change. The value of entropy effect (TΔS) exceeded that of enthalpy change around room temperature. Single stage isotope separation factors obtained were 12 for n-butylammonium and 50 for tert-butylammonium as guest compounds at 550C. (orig./RK)
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Symposium on thermodynamics of nuclear materials in conjunction with the IUPAC conference on chemical thermodynamics and 39. calorimetry conference; Hamilton (Canada); 13-17 Aug 1984; CODEN: JNUMA.
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Journal Article
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Journal of Nuclear Materials; ISSN 0022-3115;
; v. 130 p. 465-470

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[en] For production of highly enriched targets from materials in which the desired isotope is of low natural abundance, the 1800 Oak Ridge Sector Isotope Separator (ORSIS) has proven particularly successful. This machine, which is an exceptionally high-resolution separator, is interfaced with an on-line computer for surveillance and control. Isotopic enhancement factors of 4*105 have been achieved for targets prepared in this machine. Targets are prepared by placing the host material (typically carbon, aluminum, or nickel foils) at the receiver, 1 cm above the normal straight-line beam path. The desired ion species is steered onto the target through an electrostatic beam deflection system, thereby minimizing neutral particle contamination
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6. conference on application of accelerators in research and industry; Denton, TX (USA); Nov 1980; CONF-801111--
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Journal Article
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IEEE Transactions on Nuclear Science; ISSN 0018-9499;
; v. NS-28(2); p. 1588-1592

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AbstractAbstract
[en] A brief overview of some of the most important applications and developments of this important phenomenon is given. (authors)
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AbstractAbstract
[en] The stable isotopic contents of precipitation and deuterium excess (d-excess) data justified the hypothesis that two distinct vapor sources are responsible for precipitation at Tarbela. Summer vapor source from Bay of Bengal/Arabian Sea is characterized by low d-excess (≤ 10) and enriched isotopic values are due to high evaporation rate at source. δ18O and δ2H approaches 1 and 14‰ respectively in summer with d-excess 6‰.Winter vapor source is from Mediterranean Sea. Depleted isotopic values due to low evaporation rate at source are characterized by high d-excess values (≥ 16‰). δ18O and δ2H approaches - 9.8 and - 62‰ respectively with d-excess 17‰. (author)
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29 refs.
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Journal Article
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Journal of Radioanalytical and Nuclear Chemistry; ISSN 0236-5731;
; CODEN JRNCDM; v. 331(2); p. 683-690

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AbstractAbstract
[en] As a contribution to the technological development of proliferation-proof Research and Test Reactor Fuel (RERTR programme), fuel elements have been developed and designed for irradiation testing of research reactor fuel with 20% enrichment. As a part of the testing procedures, cooling channel widths and channel width profiles as a function of channel height have to be determined for different burn-up values. This has been achieved by the development and manufacturing of an installation for handling these fuel assemblies and a travelling probe based on ultrasonics for measuring the cooling channel dimensions. Some details of the measurements are given, such as method; installation; signal and data processing; results; error evaluation. (Auth.)
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Hardt, P. von der; Roettger, H. (Commission of the European Communities, Petten (Netherlands). Joint Nuclear Research Center) (eds.); 759 p; ISBN 90-277-1568-8;
; 1983; p. 657-667; D. Reidel; Dordrecht (Netherlands); International Topical Meeting on Irradiation Technology; Grenoble (France); 28-30 Sep 1982; 2 figs.; 6 diagrams.

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Book
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AbstractAbstract
[en] The Paducah Tiger is an overpack designed for the international shipment of ten-ton cylinders of uranium hexafluoride in enriched form above the level of low specific acitivity. This container is designed as a Type B Package and has undergone all the tests and analyses required for a U.S. Department of Transportation Permit No. 6553. The Paducah Tiger is currently being used to ship fuel material in the USA on both truck and rail modes of transportation. In many ways, the design resembles the Super Tigersup(R), but incorporates features such as ISO corners, quick opening fasteners, and interior shock isolators that provide a system approach to the high volume of fuel shipment required in the last half of the 20th century. (author)
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International Atomic Energy Agency, Vienna (Austria); Proceedings series; p. 137-141; ISBN 92-0-020576-3;
; 1976; p. 137-141; IAEA; Vienna; Seminar on transport packaging for radioactive materials; Vienna, Austria; 23 - 27 Aug 1976; IAEA-SR--10/42

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Book
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[en] The Oak Ridge National Laboratory (ORNL) and the US Department of Energy-Nuclear Physics Program have built a high-resolution electromagnetic isotope separator (EMIS) as a prototype for reestablishing a US-based enrichment capability for stable isotopes. ORNL has over 60 years of experience providing enriched stable isotopes and related technical services to the international accelerator target community, as well as medical, research, industrial, national security, and other communities. ORNL is investigating the combined use of electromagnetic and gas centrifuge isotope separation technologies to provide research quantities (milligram to several kilogram) of enriched stable isotopes. In preparation for implementing a larger scale production facility, a 10 mA high-resolution EMIS prototype has been built and tested. Initial testing of the device has simultaneously collected greater than 98 % enriched samples of all the molybdenum isotopes from natural abundance feedstock. (author)
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12 refs.
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Journal Article
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Journal of Radioanalytical and Nuclear Chemistry; ISSN 0236-5731;
; CODEN JRNCDM; v. 299(2); p. 995-999

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AbstractAbstract
No abstract available
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Australian Inst. of Nuclear Science and Engineering, Lucas Heights; 51 p; Nov 1981; p. 12; 3. AINSE engineering conference; Lucas Heights, Australia; 12 - 13 Nov 1981; Abstract only.
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Miscellaneous
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Rupp, A.F.
Oak Ridge National Lab., Tenn. (USA)1972
Oak Ridge National Lab., Tenn. (USA)1972
AbstractAbstract
No abstract available
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1972; 16 p; Symposium on new developments in radiopharmaceuticals and labelled compounds; Copenhagen, Denmark; 26 Mar 1973; SM--171/35
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Report
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AbstractAbstract
[en] An isotopically-enriched and purified sample of the naturally-occurring nuclide 184Os has been counted in an attempt to observe α instability. No activity was observed. From an analysis of the counting data, a lower limit for the α decay half-life of 184Os is deduced, with 95% confidence, to be 5.6 x 1013 yr. This is to be compared with the theoretical value of the half-life of 184Os which, because of mass uncertainties, ranges from about 5 x 109 yr to 4 x 1014 yr. (author)
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Journal Article
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Journal of Inorganic and Nuclear Chemistry; v. 38(1); p. 27-29
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