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  • 1
    Electronic Resource
    Electronic Resource
    4-Acetoxytricyclo[4.1.0.0^2^,^7]Hept-4-en-3-one; synthesis and novel bond reorganization of a valence isomer of 2-acetoxytropone
    Amsterdam : Elsevier
    Tetrahedron Letters 22 (1981), S. 3257-3260 
    Details
    ISSN: 0040-4039
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0040-4039(01)81878-5
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  • 2
    Electronic Resource
    Electronic Resource
    Low level measurements of129I in environmental samples (1990)
    Springer
    Journal of radioanalytical and nuclear chemistry 138 (1990), S. 187-192 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract An analytical method for the determination of127I and129I in various environemntal samples has been developed. The method consists of the separation of iodine from the samples using a double layered quartz tube firing apparatus, post-irradiation purification of iodine, and measuring126I and130I by means of gamma spectrometry. The relative standard deviations of this method was less than 6%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02049362
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of239,240Pu and241Am in environmental samples (1987)
    Springer
    Journal of radioanalytical and nuclear chemistry 115 (1987), S. 369-376 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract An accurate and reliable method has been developed and routinely carried out for the sequential determination of239,240Pu and241Am in environmental samples. After suitable pretreatment.239,240Pu and241Am are separated from other elements by means of the anion exchange resin method. Americium-241 is purified by coprecipitation with calcium oxalate and then ion exchanged in mixed media of the mineral acid-methanol. In the analysis,242Pu (or236Pu) and244Cm are used as chemical yield monitors. The recoveries of the yield monitors in the analyses of some kinds of environmental samples were 70∼80% for plutonium and 76∼86% for curium. The concentration of239,240Pu in the coastal sea water were 7.0∼22 μ Bq/l and that of241Am was 1.2∼6.3 μ Bq/l. The mean concentrations of239,240Pu in the edible parts of the marine products ranged from 0.22 to 7.4 mBq/kg · fresh and those of241Am ranged from 0.11 to 2.6 mBq/kg · fresh.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02037450
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Concentration levels and behavior of transuranium nuclides in Japanese coastal marine environment (1992)
    Springer
    Journal of radioanalytical and nuclear chemistry 156 (1992), S. 349-360 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The concentration of239,240Pu and241Am in different samples collected from the coastal marine environment of Ibaraki Prefecture, Japan facing the Pacific Ocean have been studied. Seawater samples have been collected since 1975 and sea-biota since 1981. The mean concentration levels of239,240Pu and241Am were 0.51, 0.20 for anchovy, 0.22, 0.11 for flounder, 4.9, 0.77 for brown algae, 2.0, 2.4 for shellfish, and 0.022, 0.0028 for seawater (in mBq/kl), respectively. The chronological change of239,240Pu in seawater was influence by fallout amounts. The activity ratio between the nuclides showed steady levels after two years from the end of atmospheric nuclear explosion tests. Activity levels and the ratios for each type of sample are briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02038350
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    Paper (German National Licenses)
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