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  • 1
    Electronic Resource
    Electronic Resource
    Capillary viscometer for evaluating low-viscosity solutions at elevated temperatures (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 2310-2314 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A capillary viscometer designed for evaluating low-viscosity (0.2–10 cp) solutions at elevated temperatures [20–150 °C (68–302 °F)] has been built and extensively tested. This viscometer is automated, so that minimum operator effort is needed to obtain the viscosity as a function of temperature for a given solution. This viscometer is normally operated at a constant back pressure of 90 psi to avoid bubble formation. While the viscosities are routinely measured at a shear rate of about 38 s−1, viscosity measurement at other shear rates (10–250 s−1) can also be achieved by changing the set point on the flow controller.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138702
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Determination of thorium-228, thorium-230, and thorium-232 in sediments by anion exchange and nuclear spectrometry (1985)
    s.l. : American Chemical Society
    Analytical chemistry 57 (1985), S. 1023-1026 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00283a006
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Movement of dissolved radionuclides from submerged uranium Mine tailings into the surface water of Langley Bay, Saskatchewan, Canada (1989)
    Springer
    Archives of environmental contamination and toxicology 18 (1989), S. 881-887 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract The Gunnar mine operated in northern Saskatchewan, Canada from 1955 to 1964, extracting uranium from approximately 5 × 106 tonnes of ore by the sulphuric acid leach process. Large quantities of the acidic tailings were discharged, covering the entire bottom of Langiey Bay and forming a delta. Measurements ofin situ sediments showed release rates of up to 14.8 pCi210Pb and 155.6 pCi226Ra per m2/hr along with traces of228Th and uranium into the surface water of the bay. It was calculated that, at this rate, it would take 5.5 days for the226Ra concentrations to reach the ambient concentrations of 4.8 pCi/L found in Langley Bay surface water. Comparing this with the reported 14-day hydraulic retention time for the bay, the flux of radionuclides from the sediments can account for the entire concentration measured in the surface water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160304
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The effect of uranium mine tailings on radionuclide concentrations in Langley Bay, Saskatchewan, Canada (1988)
    Springer
    Archives of environmental contamination and toxicology 17 (1988), S. 373-380 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract From 1955 to 1964 the Gunnar Uranium Mine (Canada) produced approximately 8×103 tonnes of uranium oxide and about 5×106 tonnes of waste rock tailings. Large quantities of fine tailings material washed into Langley Bay, a shallow bay opening onto Lake Athabasca. The limnoiogical characteristics of this bay make it an ideal site to study the movement and impact of some radionuclides in and on the northern environment. This paper describes the physical, chemical, and biological characteristics of Langley Bay and introduces a study of radionuclide movement begun in 1983.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01055175
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Common analytical errors in the radiodating of recent sediments (1989)
    Springer
    Environmental geology 14 (1989), S. 203-207 
    Details
    ISSN: 1432-0495
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Four possible sources of analytical error in the measurement of unsupported210Pb and/or nuclear fallout radionuclide (such as137Cs) profiles in sediment cores are pointed out. Each of these errors, if present, can significantly alter the true profile of the radionuclide under consideration. It is shown that simple procedural modifications can substantially improve the quality of analytical data that are subsequently used to develop intricate mathematical models to aid the interpretation of observed radionuclide profiles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01705132
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Geochemistry of sediments in the back bay and Yellowknife Bay of the Great Slave Lake (1989)
    Springer
    Environmental geology 14 (1989), S. 35-42 
    Details
    ISSN: 1432-0495
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Gold mining activities generated wastes with high concentrations of arsenic and zinc in the vicinity of Yellowknife, Northwest Territories, Canada. Some of the waste material has been discharged into Yellowknife Bay of Great Slave Lake. Concentrations of arsenic and zinc were determined in sediment cores collected at the depositional areas of Yellowknife Bay. Sedimentation rates were estimated using two different radiometric approaches: the depth profiles of Cs-137 and Pb-210. Geochemical composition of the sediment cores indicated input of similar material into sampling areas over the past 50 years. Age profiles of the sediment constructed from the radionuclides measurements were used to determine historical trends of arsenic and zinc inputs into Yellowknife Bay. The historical record was in good agreement with implemented remedial actions and usage patterns of both elements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01740583
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    An evaluation of the CIC model of210Pb dating of sediments (1989)
    Springer
    Environmental geology 14 (1989), S. 73-76 
    Details
    ISSN: 1432-0495
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Both linear and polynomial regression analysis techniques are used to assess the CIC (constant initial concentration) model of210Pb dating. Results obtained using published210Pb and porosity profiles in 12 freshwater sediment cores show that linear regression affords more reliable results. The polynomial regression, while capable of predicting the values of the constant β or β′ derived from porosity data, gives reasonable results only when all the coefficients of the polynomial are of appropriate sign. Lower values for all the parameters are obtained in all cases if the effect of compaction is not considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01740587
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Estimation of mixing rates in western Lake Ontario sediments by finite element analysis of210Pb profiles (1989)
    Springer
    Environmental geology 13 (1989), S. 195-200 
    Details
    ISSN: 1432-0495
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract A finite element model is used to generate theoretical excess210Pb concentration/depth profiles that are “best-fit approximations” to directly measured profiles at five locations in western Lake Ontario. The best-fit approximations are derived using a minimum error analysis technique. The results indicate that, while mixing is prevalent at all the study locations, its influence is severe at locations closer to the mouth of the Niagara River. The nonoccurrence of the implicit effects of sediment mixing in measured pollutant profiles at these locations is pointed out and it is postulated that the general assumptions of constant flux of excess210Pb and constant sedimentation rate in such models lead to unrealistic estimates of mixing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01665369
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  • 9
    Electronic Resource
    Electronic Resource
    Radionuclide partitioning across great lakes natural interfaces (1989)
    Springer
    Environmental geology 14 (1989), S. 183-186 
    Details
    ISSN: 1432-0495
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Several water and surface microlayer samples from Lake St. Clair, the Niagara River, and the North Shore of Lake Ontario collected during 1983–1986 have been assayed for a variety of radionuclides. In addition, the foam accumulating in the pool just below Niagara Falls was also analyzed and found to be the most efficient aqueous phase collector of137Cs,210Pb, and226Ra. The order of radioisotope specific activities from highest to lowest is: Lake Ontario sediment, Niagara River suspended solids, Niagara River foam, surface microlayer water, and subsurface water. Radiological dose rates to the sediments from137Cs,226Ra, and228Th total about 5 mGy/y.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01705129
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Spectrophotometric study of X Persei (1985)
    Springer
    Astrophysics and space science 110 (1985), S. 301-309 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The continuum energy distribution of the emission line star X Per (O9.5III-V) has been obtained in the wavelength range 340–710 nm and has been compared with the energy distribution of α Cam in the same wavelength range. The continuum of the star is found to be modified by the circumstellar envelope. A number density of the order of 1011 in the envelope has been obtained from the observations of Hα in emission.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00653676
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